The contributions of grain size, dislocation density and twinning to the strength of a magnesium alloy processed by ECAP

被引：71

作者：

Balogh, Levente ^{[4
]}

Figueiredo, Roberto B. ^{[3
]}

Ungar, Tamas ^{[4
]}

Langdon, Terence G. ^{[1
,2
,3
]}

机构：

[1] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[2] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[3] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England

[4] Eotvos Lorand Univ, Dept Mat Phys, H-1518 Budapest, Hungary

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 528卷 / 01期

基金：

美国国家科学基金会;

关键词：

Dislocation density; Equal-channel angular pressing; Magnesium alloy; Twinning; X-ray line profile analysis; MECHANICAL-PROPERTIES; TEXTURE EVOLUTION; CHANNEL; REFINEMENT; DEFORMATION; PRINCIPLES; BEHAVIOR; MICROSTRUCTURE; CONTRAST; SUPERPLASTICITY;

D O I：

10.1016/j.msea.2010.09.048

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes at 473 K and the evolution of strength and microstructural parameters were determined using hardness testing and X-ray line profile analysis. The results show the subgrain size and twin boundary density increase between 1 and 2 passes and then decrease, the dislocation density continuously decreases up to 8 passes and the measured microhardness remains reasonably constant between 1 and 8 passes of ECAP. The results are interpreted using a model based on the additive effects of the dislocation density and an average size factor incorporating the effects of both the twin and the subgrain boundaries. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：533 / 538

页数：6

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