Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading

被引：117

作者：

Zhou, Xin ^{[1
,2
]}

Li, Xiuyan ^{[1
]}

Lu, K. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 12期

基金：

美国国家科学基金会;

关键词：

MICROSTRUCTURAL EVOLUTION; PLASTIC-DEFORMATION; THERMAL-STABILITY; SURFACE-LAYER; NANOCRYSTALLINE; GROWTH; TEMPERATURE; RELAXATION; COPPER; CU;

D O I：

10.1103/PhysRevLett.122.126101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The greatly increased grain boundary (GB) mobility in nanograined metals under mechanical loading is distinguished from that in their coarse-grained counterparts. The feature leads to softening of nanograined materials and deviation of strength from the classical Hall-Petch relationship. In this Letter, grain size dependences of GB migration in nanograined Ag, Cu, and Ni under tension were investigated quantitatively in a wide size range. As grain size decreases from submicron, GB migration intensifies and then diminishes below a critical grain size. The GB migration peaks at about 80, 75, and 38 nm in Ag, Cu, and Ni, respectively. The suppression of GB migration below a critical size can be attributed to GB relaxation during sample processing or by postthermal annealing. With relaxed GBs the governing deformation mechanism of nanograins shifts from GB migration to formation of through-grain twins or stacking faults. GB relaxation, analogous to GB segregation, offers a novel approach to stabilizing nanograined materials under mechanical loading.

引用

页数：6

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