QUASI-SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT β SOLID SOLUTION Mg-11Li-3Zn ALLOY

被引：3

作者：

Cao Furong ^{[1
]}

Ding Hua ^{[1
]}

Wang Zhaodong ^{[2
]}

Li Yinglong ^{[1
]}

Guan Renguo ^{[1
]}

Cui Jianzhong ^{[3
]}

机构：

[1] Northeastern Univ, Coll Mat & Met, Shenyang 110819, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Tandem Rolling Automat, Shenyang 110819, Peoples R China

[3] Northeastern Univ, Key Lab Mat Electromagnet Proc Res, Minist Educ, Shenyang 110819, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2012年 / 48卷 / 02期

关键词：

Mg-Li-Zn alloy; quasi-superplasticity; mechanical property; microstructure; deformation mechanism; DOMINANT DIFFUSION PROCESS; WT-PERCENT-LI; MICROSTRUCTURAL EVOLUTION; DISLOCATION CREEP; TEMPERATURE CREEP; BEHAVIOR; FLOW; CAVITATION; MAP;

D O I：

10.3724/SP.J.1037.2011.00721

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

1.2 mm thickness sheets of ultralight Mg-11Li-3Zn alloy with a density of 1.43 g/cm(3) was obtained by casting and rolling, the elongation to failure is 200% at 573K with 1.67x 10(-2) s(-1) tensile rate, which indicates high strain rate quasi-superplasticity. Significant dynamic recrystallization and grain refinement occur at 573 K and 1.67x10(-2) s(-1) under which the grain size turns from initial 27 mu m into 9 mu m, the stress exponent is 4.4 and the activation energy for flow is 112.6 kJ/mol. It is considered that the deformation mechanism of Mg-11Li-3Zn alloy at 573 K and 1.67x 10(-2) s(-1) is dislocation climb controlled by lattice diffusion.

引用

页码：250 / 256

页数：7

共 46 条

[1] A N.-H.A., 1984, B ALLOY PHASE DIAGR, V5, P365, DOI DOI 10.1007/BF02872951
[2] FIRST REPORT ON DEFORMATION-MECHANISM MAPS
ASHBY, MF
[J]. ACTA METALLURGICA, 1972, 20 (07): : 887 - +
[3] Cadek J, 1988, CREEP METALLIC MAT, P161
[4] Superplasticity, dynamic grain growth and deformation mechanism in ultra-light two-phase magnesium-lithium alloys
Cao, F. R.
Ding, H.
Li, Y. L.
Zhou, G.
Cui, J. Z.
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (09): : 2335 - 2341
[5] CAO FR, 1999, THESIS NE U SHENYANG
[6] Cao Furong, 1999, Acta Metallurgica Sinica, V35, P770
[7] Cao FR, 2010, ACTA METALL SIN, V46, P715, DOI [10.3724/SP.J.1037.2009.00582, 10.3724/SP.J.1037.2010.00715]
[8] Superplasticity-like deformation of a coarse-grained Al5052 alloy
Chow, KK
Chan, KC
[J]. ADVANCES IN ENGINEERING PLASTICITY, PTS 1-2, 2000, 177-1 : 601 - 606
[9] Superplastic gas pressure forming of fine-grained AZ61 magnesium alloy sheet
Chung, SW
Higashi, K
Kim, WJ
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 372 (1-2): : 15 - 20
[10] Using ab initio calculations in designing bcc Mg-Li alloys for ultra-lightweight applications
Counts, W. A.
Friak, M.
Raabe, D.
Neugebauer, J.
[J]. ACTA MATERIALIA, 2009, 57 (01) : 69 - 76

← 1 2 3 4 5 →