Strain rate effect on the cyclic deformation response of UFG Al alloys

被引：6

作者：

Malekjani, Shokoufeh ^{[1
]}

Hodgson, Peter D. ^{[1
]}

Cizek, Pavel ^{[1
]}

Hilditch, Timothy B. ^{[2
]}

机构：

[1] Deakin Univ, Ctr Mat & Fibre Innovat, Geelong, Vic 3216, Australia

[2] Deakin Univ, Sch Engn, Geelong, Vic 3216, Australia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 548卷

基金：

澳大利亚研究理事会;

关键词：

Grain refinement; Strain rate effect; Shear bands; Fatigue; Aluminium alloys; ULTRAFINE-GRAINED ALUMINUM; MECHANICAL-PROPERTIES; NANOSTRUCTURED METAL; TENSILE DEFORMATION; RATE SENSITIVITY; BEHAVIOR; FATIGUE; COPPER; TEMPERATURE; DUCTILITY;

D O I：

10.1016/j.msea.2012.03.085

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Commercially pure aluminium and 2024 Al alloy were cryo-rolled and annealed to produce ultrafine grained (UFG) microstructures. Both materials were cyclically deformed under a fully reversed total strain amplitude control condition at different frequencies to study strain rate effects. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to identify microstructural changes and explain the mechanical properties. The cyclic stress response showed significant softening in commercial purity Al that was due to shear band formation and grain coarsening within these shear bands. While there was no strain rate sensitivity for commercial purity Al in terms of the mechanical response, the shear bands became noticeably more defined at lower strain rates. 2024 Al alloy had a cyclically stable response and microstructure that was not affected by strain rate. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：69 / 74

页数：6

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