Effect of the valence electron concentration on the yield strength of Ti–Zr–Nb–V high-entropy alloys
2021; Elsevier BV; Volume: 868; Linguagem: Inglês
10.1016/j.jallcom.2021.159190
ISSN1873-4669
AutoresJie Wang, Shuxin Bai, Yu Tang, Shun Li, Xiyue Liu, Jinhao Jia, Yicong Ye, Li’an Zhu,
Tópico(s)Titanium Alloys Microstructure and Properties
ResumoTo reveal the effect of the valence electron concentration on the yield strength of high-entropy alloys (HEAs), a series of Ti–Zr–Nb–V HEAs with the same atomic size mismatch were designed and prepared. Experimental results including X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) show that the alloys with a low V/Zr ratio presents a single-phase body-centred cubic (BCC) solid solution structure, while a small amount of V2Zr phase appears in the alloys with a high V/Zr ratio. The Ti25Zr25Nb25V25 alloy presented high mechanical properties (tensile yield strength σy = 876 MPa and elongation of 20.7%), and the yield strength of the Ti–Zr–Nb–V alloys increases with an increasing V/Zr ratio. Based on the analysis of all of the potential strengthening mechanisms and the intrinsic strength of the solution alloy with the metallic bonds, a positive linear relationship was proposed between the intrinsic strength and the product of the square of the valence electron concentration and the inverse of the average atomic size.
Referência(s)