Formation of Stable Schwarz Crystals in Polycrystalline Copper at the Grain Size Limit

被引：29
作者：
Jin, Zhaohui [1 ]
Li, Xiuyan [1 ]
Lu, K. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 13期
关键词：
EXACT COMPUTATION; SURFACES;
D O I：
10.1103/PhysRevLett.127.136101
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A prototype Schwarz crystal (SC) structure of dividing-space minimal grain boundaries (GBs) constrained by coherent twin boundaries (CTBs) was recently discovered in extremely fine-grained polycrystalline Cu. In this Letter, constraining effects of 3D CTB network on the formation and thermostability of SC are addressed via atomistic simulations. GB migration and evolution of CTB network trigger formation of SC diamond. CTB constraints are critical to generate GBs of zero mean curvature underlying vanishing capillary pressure, and to counterbalance the elastic driving forces of lattice. GB motion can be suppressed at temperatures close to the melting point with GB aperture down to 3 nm.
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页数：7
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