Guoliang Huang, Gongming He, Xiufang Gong, Yong He, Ying Liu, Ke Huang,
Invar 36 alloy, renowned for its ultra-low coefficient of thermal expansion (CTE), is a functional Fe– ... digital manufacturing process, can efficiently and flexibly fabricate Invar 36 alloy parts with complex geometric and exceptional ... AM and the increasing interest and demand for Invar 36 alloy parts fabrication by AM in recent ... research status and technological advancements pertaining to AM Invar 36 alloy. Firstly, an overview of the AM processes currently employed for fabricating Invar 36 alloy is provided, including laser powder bed ...
Tópico(s): High Entropy Alloys Studies
2024 - Elsevier BV | Journal of Materials Research and Technology
Bekir Akgül, Mehmet Kul, Fuat Erden,
... low CTE in Fe36Ni alloy, which also named invar 36. The anomalous CTE feature makes invar 36 an indispensable material in a wide range ... instruments in spacecraft. However, the main drawback of invar 36 is that it is a ductile material, ... The problem is afore-mentioned applications mostly necessitate invar 36 to be machined into various complex shapes, and thus, mechanical properties of invar 36 should be improved in most cases. Many ... been studied to improve the mechanical properties of invar 36, including utilization of different manufacturing methods, introduction ...
Tópico(s): Intermetallics and Advanced Alloy Properties
2023 - Taylor & Francis | Critical reviews in solid state and materials sciences/CRC critical reviews in solid state and materials sciences
Fuat Erden, Bekir Akgül, Ilhan Danaci, M. Rasit Oner,
... undesirable considering their service conditions. In this context, invar 36 is known to be a ductile material ... reported. Accordingly, the present work involves preparation of invar 36 and investigation of its TE performance. The CTE and mechanical properties of invar 36 were also measured to calculate its thermal ... comparison. The results show that Seebeck coefficient of invar 36 is −14.4 μV/K at RT ... and might suggest a mixed conduction in plain invar 36. Also, we report that invar 36 exhibits a PF of ∼2.6 μW/ ...
Tópico(s): Thermal properties of materials
2022 - Elsevier BV | Journal of Alloys and Compounds
Alok Kumar Sahoo, V. R. R. Medicherla,
... of temperatures around room temperature which is called Invar behaviour. The Invar behaviour was first observed in Fe-Ni alloys ... in physics in the year 1920. The observed Invar behaviour was puzzling and elusive for physicists. The origin of Invar phenomena has been the subject of serious concern ... of the phenomenon. The first model explained the Invar behaviour is called two gamma state model suggested ... Weiss, considers two magnetic states of Fe in Invar alloys one with high spin high volume and ... frustrated ferromagnetic state. The moment volume instabilities in Invar alloys also lead to anomalous elastic properties. The ...
Tópico(s): High Temperature Alloys and Creep
2021 - Elsevier BV | Materials Today Proceedings
Florent Moulière, Christopher G. Smith, Katrin Heider, Jing Su, Ymke van der Pol, M Thompson, James Morris, Jonathan C. M. Wan, Dineika Chandrananda, James Hadfield, Marta Grzelak, Irena Hudecova, Dominique‐Laurent Couturier, Wendy N. Cooper, Hui Zhao, Davina Gale, Matthew Eldridge, Colin Watts, Kevin M. Brindle, Nitzan Rosenfeld, Richard Mair,
... sequencing panels. Using tumor-guided sequencing and the INVAR analysis approach, mutations were detected in 7/8 ... urine samples from HGG and LGG patients using INVAR and/or sWGS. CNS, central nervous system; CSF, ... data from the body fluids were analyzed using INVAR (INtegration of VAriants Reads), a recently developed pipeline ( ... and S3). The analytical sensitivity and specificity of INVAR have been defined previously (Wan et al, 2020). ... After filtering of the tumor mutations by the INVAR algorithm, sequencing data covering 6,383 unique tumor- ...
Tópico(s): Single-cell and spatial transcriptomics
2021 - Springer Nature | EMBO Molecular Medicine
Qiangqiang Nie, Guohong Chen, Bing Wang, Lei Yang, Jianhua Zhang, Wenming Tang,
The Cu/Invar bi-metal matrix composites have a great potential to be used as novel electronic packaging materials. In order to clarify effects of the Invar particle size on microstructures and properties of the composites, two Invar powders of average sizes of 26 µm and ... were employed to fabricated the 50 wt% Cu/Invar composites, respectively, by spark plasma sintering (SPS) at ... min. The results indicate that the Cu/ fine Invar (f-Invar) composites have finer Cu grain sizes in which the f-Invar particles are semi-continuously distributed. The composites have ...
Tópico(s): Advanced ceramic materials synthesis
2021 - Elsevier BV | Journal of Alloys and Compounds
Alex Arbogast, Sougata Roy, Andrzej Nycz, Mark Noakes, Christopher Masuo, S. S. Babu,
... properties of a multi-material specimen fabricated with Invar M93 and A36 steel. A sequence of tests ... performed to investigate the viability of additively manufactured Invar M93 for lowering the coefficient of thermal expansion (CTE) in multi-material part tooling. Invar beads were additively manufactured on a steel base ... system, and samples were taken from the steel, Invar, and the interface between the two materials. The ... heat-affected zone. The CTEs measured from the Invar bead were lower than those from the other ...
Tópico(s): High Entropy Alloys Studies
2020 - Multidisciplinary Digital Publishing Institute | Materials
Yong Jun Kim, Gye-Won Kim, Han‐Ki Kim,
... nanowires (NW) network electrode on a SiO2 coated invar substrate for high performance curved thin film heaters (TFHs). To avoid influence of a conductive invar metal foil substrate, thin SiO2 film was deposited on an invar substrate as an insulating layer. We measured sheet ... reflectance, and surface morphology of Ag NWs/SiO2/invar as a function of the number of brush ... brush-painted Ag NWs network on a SiO2/invar substrate showed a low sheet resistance 38.52 ... critical radius of the optimized Ag NWs/SiO2/invar electrode was found to be 6 mm. It ...
Tópico(s): Fluid Dynamics and Thin Films
2019 - Multidisciplinary Digital Publishing Institute | Metals
Shiqi Zheng, Maximilian Sokoluk, Gongcheng Yao, Igor Maria De Rosa, Xiaochun Li,
Invar is a solid solution alloy that offers high-dimensional stability. It is challenging for traditional methods to strengthen Invar alloys without a significant increase in the coefficient ... expansion (CTE). In this work, WC nanoparticle-reinforced Invar nanocomposite was manufactured. The microstructures, mechanical properties, and ... behavior were investigated. It was found that the Invar alloy was effectively strengthened by WC nanoparticle reinforcement without significant elevation of its CTE. The Invar–WC nanocomposite exhibits an enhanced yield and tensile ...
Tópico(s): Advanced ceramic materials synthesis
2019 - Springer Nature | SN Applied Sciences
Xin Zhang, Dan Wu, Lei Yang, Changdong Shi, Yucheng Wu, Wenming Tang,
The Ag (Invar) composite powder prepared by ball milling was used to fabricate the Cu/Ag (Invar) composites. Microstructures and properties of the composites were ... that the average particle size of the Ag (Invar) powder increases rapidly at first, and then decreases ... tends to be constant. Compared with the Cu/Invar ones, the sinterability of the composites is greatly ... After the thermo-mechanical treatment, the Cu/Ag (Invar) composites are nearly fully dense with the optimum ... and element distribution. More importantly, Cu and the Invar alloy in the composites distribute continuously in a ...
Tópico(s): Powder Metallurgy Techniques and Materials
2017 - Elsevier BV | Transactions of Nonferrous Metals Society of China
Tomio Nagayama, Takayo Yamamoto, Toshihiro Nakamura,
Electrodeposited Invar Fe–Ni alloys with 36 to 40 mass% Ni were prepared from plating baths containing saccharin as ... stress reducer and containing various Fe2+ concentrations. The Invar Fe–Ni alloys contained of small amount of ... of thermal expansion (CTEs) of the as-deposited Invar Fe–Ni alloys were approximately 9 to 11 ... and were larger than those of pyrometallurgically produced Invar alloys. When the alloys were heat-treated at ... those of pyrometallurgically produced alloys. The as-deposited Invar Fe–Ni alloys were mainly composed of metastable ...
Tópico(s): Metallurgical and Alloy Processes
2016 - Elsevier BV | Electrochimica Acta
M. Acet, Thomas Schneider, H. Zähres, E. F. Wassermann, Werner Pepperhoff,
Anti-Invar behavior in a material can be characterized by an anomalously large and a weak temperature-dependent thermal- ... expansion. It is just the opposite of the Invar effect, which is characterized by an anomalously small thermal-expansion coefficient. Common to Invar and anti-Invar is the fact that both posess moment-volume instabilities. Anti-Invar is observed in the paramagnetic state. It occurs ... fcc stability range. The effect vanishes as the Invar concentration, x=65 at. %, is approached. To examine ...
Tópico(s): Metallurgical and Alloy Processes
1994 - American Institute of Physics | Journal of Applied Physics
M. Acet, H. Zähres, E. F. Wassermann, Werner Pepperhoff,
Just as Invar describes a system with a smaller than ``normal'' thermal expansion in a magnetically ordered state, a system with ... magnetically disordered state can be described as anti-Invar. Anti-Invar had been already observed in a number of ... 3d series well above magnetic ordering temperatures. While Invar is characterized by low-temperature moment-volume instabilities, anti-Invar signifies the importance of high-temperature moment-volume ... expansion at high temperatures, i.e., the anti-Invar effect. With the aid of the thermal properties ...
Tópico(s): Magnetic Properties and Applications
1994 - American Physical Society | Physical review. B, Condensed matter
Tomoyuki Kakeshita, Ken rsquo ichi Shimizu, Shin rsquo ichi Kijima, Zhihong Yu, Muneyuki Date,
... filed-induced martensitic transformations in Fe–Ni–C Invar (Fe-30.2 Ni-0.4C and Fe-30.4 Ni-0.3C (mass%)) and non-Invar (Fe-26.0 Ni-0.4C (mass%)) alloys were studied to clarify the Invar effect on the transformations by means of magnetization ... Ms irrespective as to whether the alloy is Invar or non-Invar. The critical field increases with increasing temperature, and ... line consisting of two straight parts for the Invar alloys, but on a straight line for the non-Invar alloy. This result and a thermodynamical analysis suggest ...
Tópico(s): High Entropy Alloys Studies
1985 - Japan Institute of Metals and Materials | Transactions of the Japan Institute of Metals
Shigehumi Onodera, Yoshikazu Ishikawa, Keisuke Tajima,
Spin dynamics of a disordered Invar alloy Fe 65 Ni 35 , an ordered Invar alloy Fe 3 Pt as well as a non Invar disordered alloy Fe 50 Ni 50 have been ... neutron scattering. It has been found that both Invar alloys show common anomalous dynamical properties. Well defined ... temrerature variation of magnetization M ( T ) for the Invar alloys, in spite of the fact that the ... part in M ( T ). M ( T ) of non Invar alloy could be accounted for by the magnon excitations. The magnons in the Invar alloys dampen significantly with increasing temperature as was ...
Tópico(s): Magnetic Properties of Alloys
1981 - Physical Society of Japan | Journal of the Physical Society of Japan
Herta Flor, H.‐J. Gudladt, Ch. Schwink,
... Curie temperature the critical shear stress of the Invar alloys increases much more rapidly than that of ... Curie temperature the stress-strain curves of the Invar crystals differ from those of other f.c. ... mobility on the magnetic properties of FeNi Invar. It is shown that the experiments cannot be ... une étude de la déformation de monocristaux d'invar FeNi orientés pour le glissement simple, dans ... la contrainte de cisaillement critique dans les alliages invar est la plus rapide de tous les alliages ... Curie, les courbes contrainte-déformation des monocristaux d'invar different de celles des autres alliages c.f. ...
Tópico(s): Microstructure and mechanical properties
1980 - University of Toronto Press | Acta Metallurgica
... constants of f.c.c. ferromagnetic Fe-Ni Invar alloys have been determined in both the ferromagnetic ... are shown to be closely related to the Invar properties of these alloys. A quantitative description of the Invar behavior of the elastic constants is given in ... in this range—cannot be explained by the Invar properties of these alloys. We have tentatively assumed ... presumably Fe3Ni. Les constantes élastiques monocristallines des alliages Invar Fe-Ni c.f.c. ferromagnétiques ont été ... que ces anomalies sont étroitement reliées aux propriétés Invar de ces alliages, et donnent une description quantitative ...
Tópico(s): Magnetic properties of thin films
1973 - University of Toronto Press | Acta Metallurgica
Bodo Gehrmann, M. Acet, Heike C. Herper, E.F. Wassermann, Werner Pepperhoff,
The ferromagnetic invar effect in f.c.c. 3d-transition metal alloys spans an (s+d) valence electron concentration range of ... 5. The maximum spontaneous magnetostriction associated with the invar effect occurs at e/a ≈︂ 8.7. For e/a ≤ 8.6, the anti-invar effect develops, for which the associated volume enhancement ... 8 is approached. The progressive change from anti-invar to invar in Fe1—xNix alloys takes place in the ... implying that Co should be an element having invar properties. To verify this assessment we examine, by ...
Tópico(s): Magnetic Properties of Alloys
1999 - Wiley | physica status solidi (b)
S. H. Lohaus, Matthew Heine, P. Guzman, C. M. Bernal-Choban, C. N. Saunders, Guoyin Shen, Olle Hellman, David Broido, Brent Fultz,
The anomalously low thermal expansion of Fe–Ni Invar has long been associated with magnetism, but to date, the microscopic underpinnings of the Invar behaviour have eluded both theory and experiment. Here ... contributions to thermal expansion. We find that the Invar behaviour stems from a competition between phonons and ... over the 0–3 GPa pressure range of Invar behaviour. At pressures above 3 GPa, the cancellation ... accuracy of this cancellation over the range of Invar behaviour. Spin–phonon interactions also explain how different ...
Tópico(s): Rare-earth and actinide compounds
2023 - Nature Portfolio | Nature Physics
Ziyuan Rao, Hauke Springer, Dirk Ponge, Zhiming Li,
To develop novel Invar alloys in the practically infinite compositional space of multicomponent alloys, rapid alloy prototyping is used to investigate five multicomponent Invar alloys with 5 at.% addition of Al, Cr, Cu, Mn and Si to a super Invar alloy (Fe63Ni32Co5; at.%), respectively. All alloys show abnormally ... deviating from the Slater-Pauling curve, revealing their Invar-behavior. The relationships among valence electron concentration, magnetic properties, and Invar behavior of the various multicomponent alloys are discussed. ...
Tópico(s): Shape Memory Alloy Transformations
2022 - Elsevier BV | Materialia
Cuixin Chen, Bin Ma, Baoxi Liu, Jun He, Haitao Xue, Yu-qiang Zuo, Xuchen Li,
Strengthening invar alloy while ensuring its low coefficient of thermal expansion by refining microstructure has been a thorny issue ... modifier on rapid solidified microstructure and properties of invar alloy prepared by a mini-type vacuum arc melting furnace were investigated in detail. Invar alloy with uniform and fine structure was obtained ... refinement rate of austenite grain and substructure of invar alloy up to 45% and 67.4%, respectively. ... that the coefficient of thermal expansion (CTE) of invar alloy with the addition of alloying elements is ...
Tópico(s): Advanced materials and composites
2019 - Elsevier BV | Materials Chemistry and Physics
Peng Chen, Huagui Huang, Ce Ji, Xu Zhang, Zhonghua Sun,
Based on traditional twin-roll casting process, Invar/Cu clad strips were successfully fabricated by using solid Invar alloy strip and molten Cu under conditions of high temperature, high pressure and ... carried out to analyze the mechanical properties of Invar/Cu clad strips and the micro-morphology of ... delamination phenomenon occurs during the compatible deformation of Invar/Cu in bending test and only one stress ... large. On the contrary, different mechanical properties of Invar and Cu lead to delamination phenomenon during the ...
Tópico(s): Metal Forming Simulation Techniques
2018 - Elsevier BV | Transactions of Nonferrous Metals Society of China
Qiang Hu, J.M. Wang, Yuqiang Yan, Sheng Guo, S.S. Chen, De Lu, Jizhao Zou, Xiaohui Zeng,
Invar alloys have a wide application owing to its low expansion characteristics. Recently, it is revealed that ... higher strength than that of traditional Fe-Ni Invar alloys, also have the Invar effect. Combining the low expansion of the Invar effect and the good mechanical properties of Fe- ... applications, for which firstly systematic study on the Invar effect of Fe-based BMGs is needed. In ... The results show all the alloys have the Invar effect, but can be categorized in two types, ... of Fe by Co and Ni weakens the Invar effect. These findings are explained based on the ...
Tópico(s): Magnetic properties of thin films
2017 - Elsevier BV | Intermetallics
A. A. Gulyaev, E. L. Svistunova,
To develop novel Invar alloys in the practically infinite compositional space of multicomponent alloys, rapid alloy prototyping is used to investigate five multicomponent Invar alloys with 5 at.% addition of Al, Cr, Cu, Mn and Si to a super Invar alloy (Fe63Ni32Co5; at.%), respectively. All alloys show abnormally ... deviating from the Slater-Pauling curve, revealing their Invar-behavior. The relationships among valence electron concentration, magnetic properties, and Invar behavior of the various multicomponent alloys are discussed. ...
Tópico(s): Microstructure and Mechanical Properties of Steels
1995 - Pergamon Press | Scripta Metallurgica et Materialia
We briefly review the history of the Invar-effect and present experimental data on the Invar behavior of FeNiMn, Fe3Pt and amorphous FeB alloys, clearly demonstrating that neither magnetic (or metallurgical) ... nor weak itineracy are the origin of the Invar-effect, as believed for a long time. Instead, ... basis for a principally new understanding of the Invar-effect. Although the volume instabilities of the magnetic moments of certain but Invar typical 3d-elements are observed at T = 0 ... specific heat and thermal expansion anomalies in different Invar systems. The results give further support for the ...
Tópico(s): Magnetic Properties of Alloys
1989 - IOP Publishing | Physica Scripta
Ken Lagarec, Denis Rancourt, S. K. Bose, R. A. Dunlap,
... temperatures, thereby providing an experimental proof that anti-Invar behavior is due to such HM stabilization. In Invar (Fe 65 Ni 35 ) and at near-Invar compositions, we observe temperature-induced changes in electronic ... follow the spontaneous magnetization curves and find that Invar is predominantly a HM phase at all temperatures where an Invar effect occurs. We show that LM phase thermal excitation cannot cause the Invar effect and that such excitation would cause a ...
Tópico(s): Microstructure and Mechanical Properties of Steels
2002 - Taylor & Francis | Phase Transitions
Bin Wang, Yanbao Guo, Zheng Zhang, Xiaohong Yi, Deguo Wang,
... bearings has become a huge challenge for researchers. Invar 36 alloy, as a low expansion nickel-titanium ... properties. In this work, the tribological performance of Invar 36 alloy is mainly investigated against Si3N4 ceramic ... with a minimum value of −196 °C. The Invar 36 alloy exhibits excellent tribological properties, whose COF ... and compared under the same conditions, proving that Invar 36 alloy exhibits better tribological properties than G95Cr18 ... to its extremely low coefficient of thermal expansion, Invar 36 alloy exhibits higher toughness and strength than ...
Tópico(s): Metal Alloys Wear and Properties
2023 - Elsevier BV | Wear
Eider Aldalur, Alfredo Suárez, Fernando Veiga,
Invar 36 alloy is of high interest in various industrial sectors, due to its reduced thermal expansion ... a valid method for manufacturing aerospace tooling in Invar 36. The main novelty and the objective of this work is to study the properties of Invar deposited by WAAM technology and to provide guidelines ... To do so, the thermal expansion behaviour of Invar specimens manufactured using Gas Metal Arc Welding (GMAW)- ... comparison with the values obtained from the laminated Invar sample used as the reference specimen. A wall ...
Tópico(s): Welding Techniques and Residual Stresses
2022 - Elsevier BV | Journal of Materials Research and Technology
... doped indium oxide (ITO) films sputtered on flexible invar metal foil covered with an insulating SiO2 layer ... and microstructure of the ITO films on SiO2/invar substrate are investigated as a function of the ... at room temperature. In particular, high reflectance of invar metal substrate could enhance the power conversion efficiency ... perovskite solar cell fabricated on the ITO/SiO2/invar substrate. In addition, critical bending radius of the ... to show flexibility of the ITO film on invar metal substrate. This suggests that the ITO/SiO2/ ...
Tópico(s): Organic Electronics and Photovoltaics
2019 - Multidisciplinary Digital Publishing Institute | Metals
Yun Zou, Binghui Ma, Haichao Cui, Fenggui Lu, Peiquan Xu,
To strengthen Invar alloy, nanostructured carbide-strengthened cobalt-based cladding layers were fabricated on an Invar alloy by laser cladding. The cladding layers contained ... improved the wear and oxidation resistance of the Invar alloy without changing its coefficient of thermal expansion. ... decreased by 28.6% compared with that of Invar substrate. The oxide layers of samples with cladding ... 1073 K, which was thinner than that of Invar substrate (88.38 μm). Cr3C2 displayed higher oxidation ... believed to be the surface strengthening mechanism of Invar alloys.
Tópico(s): Metal and Thin Film Mechanics
2019 - Elsevier BV | Surface and Coatings Technology