Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

被引：61

作者：

Pereira, Pedro Henrique R. ^{[1
,2
]}

Wang, Ying Chun ^{[3
]}

Huang, Yi ^{[1
]}

Langdon, Terence G. ^{[1
]}

机构：

[1] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton S017 1BJ, Hants, England

[2] Minist Educ Brazil, CAPES Fdn, BR-70040020 Brasilia, DF, Brazil

[3] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 685卷

基金：

欧洲研究理事会; 中国国家自然科学基金;

关键词：

Aluminium alloys; Dynamic testing; Equal-channel angular pressing; Hall-Petch relationship; Superplasticity; HALL-PETCH RELATIONSHIP; SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; RATE SENSITIVITY; RATE SUPERPLASTICITY; ALUMINUM-ALLOYS; BOUNDARY SEGREGATION; THERMAL-STABILITY; HIGH-STRENGTH;

D O I：

10.1016/j.msea.2017.01.020

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was similar to 300 mu m and this was reduced to similar to 250 mu m by ECAP and then increased to similar to 600 mu m by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from similar to 10(-4) to similar to 10(3) s(-1). The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy.

引用

页码：367 / 376

页数：10

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