Segregation-induced grain boundary premelting in nickel-doped tungsten
2005; American Institute of Physics; Volume: 87; Issue: 23 Linguagem: Inglês
10.1063/1.2138796
ISSN1520-8842
AutoresJian Luo, Vivek K. Gupta, Dang‐Hyok Yoon, Harry M. Meyer,
Tópico(s)Advanced materials and composites
ResumoHigh-resolution transmission electron microscopy and Auger spectroscopy have revealed the formation of nanometer-thick, Ni-enriched, disordered, grain boundary layers in Ni-doped W specimens at 95 °C below the bulk eutectic temperature. The stabilization of subeutectic liquid-like grain boundary cores in this model two-component metallic alloy is phenomenologically analogous to the long-sought phenomenon of grain boundary premelting. The existence of such disordered nanostructures at metallic grain boundaries provides insights to resolve several long-standing controversies in interpreting the unique grain boundary diffusion∕migration kinetics and mechanical properties for this system, and can have technological importance for a broader range of materials.
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