Microstructural evolution and mechanical properties of Mg95.5Y3Zn1.5 alloy processed by extrusion and ECAP

被引：16
作者：
Chen, Bin [1 ]
Lu, Chen [1 ]
Lin, Dongliang [1 ]
Zeng, Xiaoqin [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
来源：
METALS AND MATERIALS INTERNATIONAL | 2014年 / 20卷 / 02期
基金：
中国国家自然科学基金;
关键词：
alloys; extrusion; microstructure; transmission electron microscopy (TEM); equal channel angular pressing (ECAP); LOW-TEMPERATURE SUPERPLASTICITY; CHANNEL-ANGULAR EXTRUSION; MAGNESIUM ALLOY; MG ALLOY; BEHAVIOR;
D O I：
10.1007/s12540-014-2025-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A Mg95.5Y3Zn1.5 alloy processed via a two-step processing route of extrusion plus ECAP has been investigated. It was found that the ECAP processed Mg95.5Y3Zn1.5 alloy contained ultrafine grains and exhibited excellent mechanical properties. After ECAP, the average grain size of Mg95.5Y3Zn1.5 alloy was refined to about 300 nm. The highest strengths, with yield strength of 444.6 MPa and ultimate tensile strength of 472.7 MPa, were obtained after 1 pass at 623 K. The SAED patterns indicated that the microstructure after ECAP consisted of both high angle and low angle grain boundaries. The fraction of high-angle boundaries increased with increasing numbers of ECAP passes. The Mg95.5Y3Zn1.5 alloy contained a high volume fraction of X-Mg12ZnY phase due to high yttrium and zinc addition. And, it accelerated the growth and coalescence of cracks during tensile testing, resulting in premature fracture and lower elongation of alloy.
引用
收藏
页码：285 / 290
页数：6
相关论文
共 18 条
[1]   Elevated temperature mechanical behavior of Mg-Y-Zn alloys [J].
Chen, Bin ;
Lin, Dongliang ;
Zeng, Xiaoqin ;
Lu, Chen .
2006 BIMW: 2006 BEIJING INTERNATIONAL MATERIALS WEEK, PTS 1-4: MAGNESIUM, 2007, 546-549 :237-+
[2]   Microstructure and mechanical properties of ultrafine grained Mg97Y2Zn1 alloy processed by equal channel angular pressing [J].
Chen, Bin ;
Lin, Dongliang ;
Zeng, Xiaoqin ;
Lu, Chen .
JOURNAL OF ALLOYS AND COMPOUNDS, 2007, 440 (1-2) :94-100
[3]   Characterization of microstructure in high strength Mg96Y3Zn1 alloy processed by extrusion and equal channel angular pressing [J].
Chen Bin ;
Lu Chen ;
Lin Dongliang ;
Zeng Xiaoqin .
JOURNAL OF RARE EARTHS, 2011, 29 (09) :902-906
[4]   Low-temperature superplasticity and internal friction in microcrystalline Mg alloys processed by ECAP [J].
Chuvil'deev, VN ;
Nieh, TG ;
Gryaznov, MY ;
Sysoev, AN ;
Kopylov, VI .
SCRIPTA MATERIALIA, 2004, 50 (06) :861-865
[5]   Effect of ECAP on microstructure and mechanical properties of ZE41 magnesium alloy [J].
Ding, Rengen ;
Chung, Chuanwei ;
Chiu, Yulung ;
Lyon, Paul .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (16-17) :3777-3784
[6]   A two-step processing route for achieving a superplastic forming capability in dilute magnesium alloys [J].
Horita, Z ;
Matsubara, K ;
Makii, K ;
Langdon, TG .
SCRIPTA MATERIALIA, 2002, 47 (04) :255-260
[7]   Texture development and its effect on mechanical properties of an AZ61 Mg alloy fabricated by equal channel angular pressing [J].
Kim, WJ ;
Hong, SI ;
Kim, YS ;
Min, SH ;
Jeong, HT ;
Lee, JD .
ACTA MATERIALIA, 2003, 51 (11) :3293-3307
[8]   Mechanical properties of a two-phase alloy Mg-8%Li-1%Al processed by equal channel angular pressing [J].
Liu, T ;
Zhang, W ;
Wu, SD ;
Jiang, CB ;
Li, SX ;
Xu, YB .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 360 (1-2) :345-349
[9]   Low temperature superplasticity in an AZ91 magnesium alloy processed by ECAE [J].
Mabuchi, M ;
Iwasaki, H ;
Yanase, K ;
Higashi, K .
SCRIPTA MATERIALIA, 1997, 36 (06) :681-686
[10]   Effects of rare earth elements and Ca additions on high temperature mechanical properties of AZ31 magnesium alloy processed by ECAP [J].
Masoudpanah, S. M. ;
Mahmudi, R. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (16-17) :3685-3689
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