Influence of structure of grain boundaries and size distribution of grains on the yield strength at quasistatic and dynamical loading

被引：14
作者：
Borodin, Elijah N. [1 ,2 ,3 ]
Mayer, Alexander E. [1 ,4 ]
机构：
[1] Chelyabinsk State Univ, Bratyev Kashirinykh Str 129, Chelyabinsk 454001, Russia
[2] Ural Fed Univ, Lenin Ave 51, Ekaterinburg 620083, Russia
[3] RAS, Inst Problems Mech Engn, VO, Bolshoj Pr 61, St Petersburg 199178, Russia
[4] South Ural State Univ, Lenin Ave 76, Chelyabinsk 454080, Russia
来源：
MATERIALS RESEARCH EXPRESS | 2017年 / 4卷 / 08期
关键词：
grain boundary sliding; inverse Hall-Petch relation; high strain rates; grain size distribution; grain boundary viscosity; nanostructured metals; PLASTIC-DEFORMATION; NANOCRYSTALLINE MATERIALS; ATOMISTIC SIMULATION; STRESS; METALS; COPPER; DEPENDENCE; MODEL; RELAXATION; FRACTURE;
D O I：
10.1088/2053-1591/aa8514
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dependences of the yield strength of metals on the grain size and the dispersion of the grain size are discussed for quasistatic and dynamic conditions of loading. In these two cases, the size distribution of grains influences differently on the slope of the Hall-Petch curve. The presence of wide size distribution of grains shifts the maximal yield strength to smaller grains, which can obstruct an observation of the inverse Hall-Petch effect. According to our analyses, the role of the grain boundary structure is significant both at low strain rate in the coarse-grained materials and at high strain rate in the fine-grained materials.
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页数：9
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