Structural Evolution on the Cross-Section of an AZ31 Magnesium Alloy Processed by High-Pressure Torsion

被引：8

作者：

Figueiredo, Roberto B. ^{[1
]}

Langdon, Terence G. ^{[2
,3
,4
]}

机构：

[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-31270901 Belo Horizonte, MG, Brazil

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

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

[4] Univ Southampton, Sch Engn Sci, Mat Res grp, Southampton SO17 1BJ, Hants, England

来源：

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION: NANOSPD5, PTS 1 AND 2 | 2011年 / 667-669卷

基金：

美国国家科学基金会;

关键词：

magnesium alloys; high-pressure torsion; microhardness; flow localization; GRAIN-REFINEMENT;

D O I：

10.4028/www.scientific.net/MSF.667-669.247

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Disks of an AZ31 magnesium alloy were processed by High-Pressure Torsion (HPT) at 463 K to different numbers of rotations. The grain structure was evaluated along the cross-section of the disks using optical microscopy. Significant heterogeneities in the average grain size were observed in areas of the disks which were located at similar distances to the center but at different distances from the surface. Moreover, different grain structures were observed in neighboring areas and shear bands occurred at several locations in the disks. Microhardness tests revealed differences in the strength of the material as a function of the distance to the surface. An analysis of the grain structure and hardness distribution suggests the occurrence of flow localization in HPT processing.

引用

页码：247 / +

页数：2

共 7 条

[1] Grain refinement and mechanical behavior of a magnesium alloy processed by ECAP [J].

Figueiredo, Roberto B. ;

Langdon, Terence G. .

JOURNAL OF MATERIALS SCIENCE, 2010, 45 (17) :4827-4836

[2] The nature of grain refinement in equal-channel angular pressing: a comparison of representative fcc and hcp metals [J].

Figueiredo, Roberto B. ;

Langdon, Terence G. .

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 2009, 100 (12) :1638-1646

[3] Principles of grain refinement in magnesium alloys processed by equal-channel angular pressing [J].

Figueiredo, Roberto B. ;

Langdon, Terence G. .

JOURNAL OF MATERIALS SCIENCE, 2009, 44 (17) :4758-4762

[4] DYNAMIC RECRYSTALLIZATION AND THE DEVELOPMENT OF MICROSTRUCTURE DURING THE HIGH-TEMPERATURE DEFORMATION OF MAGNESIUM [J].

ION, SE ;

HUMPHREYS, FJ ;

WHITE, SH .

ACTA METALLURGICA, 1982, 30 (10) :1909-1919

[5]

Kawasaki M., 2010, ACTA MAT IN PRESS

[6] Developing high-pressure torsion for use with bulk samples [J].

Sakai, G ;

Nakamura, K ;

Horita, Z ;

Langdon, TG .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 406 (1-2) :268-273

[7] Using high-pressure torsion for metal processing: Fundamentals and applications [J].

Zhilyaev, Alexander P. ;

Langdon, Terence G. .

PROGRESS IN MATERIALS SCIENCE, 2008, 53 (06) :893-979

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