Abstracts Structural stability of nanograined (NG) metals at elevated temperatures or under mechanical loadings is much reduced relative to that of their coarse-grained counterparts, bottlenecking their processing and applications. In this paper, we present recent progress in stabilization of NG metals with grain boundary (GB) relaxation mediated by interactions of GBs and partial dislocations. Two strategies for inducing GB relaxation were identified in NG and submicro-grained pure metals: plastic deformation of nanograins below critical sizes and rapid heating for forming annealing twins. With the GB relaxation, both thermal stability and mechanical stability of nanograins in several pure metals are enhanced significantly.

中文翻译：

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通过晶界松弛稳定金属中的纳米晶粒

摘要 纳米晶粒 (NG) 金属在高温或机械载荷下的结构稳定性相对于粗晶粒金属的结构稳定性大大降低，从而阻碍了它们的加工和应用。在本文中，我们介绍了通过 GB 和部分位错的相互作用介导的晶界 (GB) 弛豫稳定 NG 金属的最新进展。在 NG 和亚微晶纯金属中确定了两种诱导 GB 弛豫的策略：低于临界尺寸的纳米晶粒的塑性变形和用于形成退火孪晶的快速加热。随着 GB 弛豫，纳米颗粒在几种纯金属中的热稳定性和机械稳定性均显着增强。