Microstructure and mechanical properties of ultrafine grained Mg97Y2Zn1 alloy processed by equal channel angular pressing

被引：55

作者：

Chen, Bin

Lin, Dongliang ^{[1
]}

Zeng, Xiaoqin

Lu, Chen

机构：

[1] Shanghai Jiao Tong Univ, Key Lab Educ Minist High Temperature Mat & Testin, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 440卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

microstructure; mechanical property; ultrafine grain; Mg97Y2Zn1; long-period stacking structure; equal channel angular pressing;

D O I：

10.1016/j.jallcom.2006.09.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The Mg(97)y(2)Zn(1) alloy processed by equal channel angular pressing (ECAP) has been investigated. It was found that the blocks of secondary phase were broken into uniform distributed sections after ECAP The Mg97Y2Zn1 alloy processed by ECAP obtained ultrafine grains and exhibits excellent mechanical properties. The average grain size of about 330 nm, yield strength (YS) of 400.3 MPa and ultimate tensile strength (UTS) of 450.0 MPa were obtained by two-step ECAP of 4 passes at 623 K and 2 passes at 603 K. The long-period stacking (LPS) structures contribute to the formation of ultrafine grains in ECAP processed Mg97Y2Zn1 alloy. The results demonstrate that ECAP instead of rapid solidified powder metallurgy (RS/PM) can refine grain size and enhance the strength of Mg97Y2Zn1 alloy. It was also found that the elongation of alloy is decreased with increasing pass number. It was found that cracks were preferentially initiated and propagated in the interior of X-phase during the process of ECAP. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：94 / 100

页数：7

共 21 条

[1] Long-period ordered structure in a high-strength nanocrystalline Mg-1 at% Zn-2 at% Y alloy studied by atomic-resolution Z-contrast STEM [J].

Abe, E ;

Kawamura, Y ;

Hayashi, K ;

Inoue, A .

ACTA MATERIALIA, 2002, 50 (15) :3845-3857

[2]

[Anonymous], UNPUB

[3] Microstructure development during equal channel angular drawing of Al at room temperature [J].

Chakkingal, U ;

Suriadi, AB ;

Thomson, PF .

SCRIPTA MATERIALIA, 1998, 39 (06) :677-684

[4] Single roll drive equal channel angular process - a potential severe plastic deformation (SPD) process for industrial application [J].

Chen, B ;

Lin, DL ;

Zeng, XQ ;

Lu, C .

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION, 2006, 503-504 :557-560

[5] Novel hexagonal structure and ultrahigh strength of magnesium solid solution in the Mg-Zn-Y system [J].

Inoue, A ;

Kawamura, Y ;

Matsushita, M ;

Hayashi, K ;

Koike, J .

JOURNAL OF MATERIALS RESEARCH, 2001, 16 (07) :1894-1900

[6] Long period stacking structures observed inMg97Zn1Y2 alloy [J].

Itoi, T ;

Seimiya, T ;

Kawamura, Y ;

Hirohashi, M .

SCRIPTA MATERIALIA, 2004, 51 (02) :107-111

[7] The process of grain refinement in equal-channel angular pressing [J].

Iwahashi, Y ;

Horita, Z ;

Nemoto, M ;

Langdon, TG .

ACTA MATERIALIA, 1998, 46 (09) :3317-3331

[8] Mechanical properties and microstructure of AZ31 Mg alloy processed by two-step equal channel angular extrusion [J].

Jin, L ;

Lin, DL ;

Mao, DL ;

Zeng, XQ ;

Ding, WJ .

MATERIALS LETTERS, 2005, 59 (18) :2267-2270

[9] Microstructure evolution of AZ31 Mg alloy during equal channel angular extrusion [J].

Jin, Li ;

Lin, Dongliang ;

Mao, Dali ;

Zeng, Xiaoqing ;

Chen, Bin .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 423 (1-2) :247-252

[10] 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

← 1 2 3 →