Grain boundary sliding and rotational mechanisms of intragranular deformation at different creep stages of high-purity aluminum polycrystals at various temperatures and stresses

被引：10

作者：

Panin, V. E. ^{[1
,2
]}

Surikova, N. S. ^{[1
]}

Elsukova, T. F. ^{[1
]}

Vlasov, I. V. ^{[1
]}

Borisyuk, D., V ^{[1
,2
]}

机构：

[1] Inst Strength Phys & Mat Sci SB RAS, Tomsk 634055, Russia

[2] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 733卷

基金：

俄罗斯基础研究基金会;

关键词：

Creep; High-purity aluminum polycrystals; Grain boundary sliding; Plasticity methods; Grains and interfaces; Fracture; PLASTIC-DEFORMATION; PHYSICAL MESOMECHANICS; DIFFUSIONAL CREEP; DISLOCATION CREEP; DENUDED ZONES; SOLIDS; FRACTURE;

D O I：

10.1016/j.msea.2018.07.038

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In the paper we show that grain boundary sliding dominates in the creep of A999 aluminum polycrystals and is accommodated by rotation modes of intragranular deformation. Accommodation mechanisms strongly depend on the applied stress a and creep temperature T. At low sigma and T, accommodation occurs by dislocation glide and mesoscale fragmentation. At high sigma and T, there appears lattice curvature, which causes the development of shear bands, multiscale fragmentation, and formation of a quasi-neck with nanosized subgrains and plastic microrotations. Noncrystallographic shears in their subboundaries propagate in local lattice curvature zones under tau(max) by the plastic distortion mechanism.

引用

页码：276 / 284

页数：9

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