Segregation-induced grain boundary premelting in nickel-doped tungsten
Segregation-induced grain boundary premelting in nickel-doped tungsten
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DOI：
10.1063/1.2138796
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发表时间：
2005-12-05
影响因子：
4
通讯作者：
Meyer, HM
中科院分区：
文献类型：
--
作者：
Luo, J;Gupta, VK;Meyer, HM
高分辨率透射电子显微镜和俄歇能谱揭示了在低于本体共晶温度95摄氏度的Ni掺杂W试样中形成纳米厚的、Ni富集的、无序的晶界层。在该模型的双组分金属合金中，亚共沸液体状晶界核心的稳定化在现象上类似于长期寻求的晶界预熔化现象。这种无序的纳米结构在金属晶界的存在提供了见解，以解决几个长期存在的争议，在解释独特的晶界扩散/迁移动力学和机械性能，为这个系统，并可以有更广泛的材料的技术重要性。(c)2005年美国物理学会。
High-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 degrees 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. (c) 2005 American Institute of Physics.