Microstructural evolution and mechanical properties of a two-phase Cu-Ag alloy processed by high-pressure torsion to ultrahigh strains

被引：117
作者：
Tian, Y. Z. [1 ]
Wu, S. D. [1 ]
Zhang, Z. F. [1 ]
Figueiredo, R. B. [2 ]
Gao, N. [3 ]
Langdon, T. G. [3 ,4 ,5 ]
机构：
[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
[2] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-31270901 Belo Horizonte, MG, Brazil
[3] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
[4] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[5] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Cu-Ag alloy; High-pressure torsion; Microstructure; Hardness; Fracture; GRAIN-REFINEMENT; NANOSTRUCTURED MATERIALS; TENSILE PROPERTIES; ALUMINUM-ALLOY; PURE ALUMINUM; DEFORMATION; HOMOGENEITY; STRENGTH; METALS; COPPER;
D O I：
10.1016/j.actamat.2011.01.017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Disks of a coarse-grained Cu-28 wt.% Ag alloy were processed by high-pressure torsion up to 20 revolutions to reveal the microstructural evolution and mechanical properties. The eutectic shows a faster evolution process than the Cu matrix. A banded structure forms in the Cu matrix, and both the eutectic spacing and the band width decrease with increasing shear strain. After 20 revolutions, the substructure may even diminish in the Cu matrix. The microhardness increases with increasing revolutions, and a saturation microhardness is ultimately achieved. After 20 revolutions, the tensile strength was improved to similar to 1420 MPa, and the failure mode of the sample was transferred from necking to full shearing without plasticity. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2783 / 2796
页数：14
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