Compression-creep response of magnesium alloy DieMag422 containing barium compared with the commercial creep-resistant alloys AE42 and MRI230D

被引：56

作者：

Dieringa, Hajo ^{[1
]}

Huang, Yuanding ^{[1
]}

Wittke, Philipp ^{[2
]}

Klein, Martin ^{[2
]}

Walther, Frank ^{[2
]}

Dikovits, Martina ^{[3
]}

Poletti, Cecilia ^{[3
]}

机构：

[1] Helmholtz Zentrum Geesthacht, Ctr Mat & Coastal Res, MagIC, Inst Mat Res, D-21502 Geesthacht, Germany

[2] TU Dortmund, Fac Mech Engn, Dept Mat Test Engn WPT, D-44227 Dortmund, Germany

[3] Graz Univ Technol, Inst Mat Sci & Welding, A-8010 Graz, Austria

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 585卷

基金：

奥地利科学基金会;

关键词：

Compression creep; Magnesium alloys; Barium; AE42; MRI230D; Threshold stress; STEADY-STATE CREEP; THRESHOLD STRESSES; DISLOCATION CLIMB; HARD PARTICLES; CAST MAGNESIUM; BEHAVIOR; ALUMINUM; MICROSTRUCTURE; THERMODYNAMICS; TEMPERATURES;

D O I：

10.1016/j.msea.2013.07.041

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The development of creep-resistant magnesium alloys that avoid the use of rare-earth alloying elements is an important area of research. The creep response of Mg-Al-Ca alloy containing barium (DieMag422) was compared to that of commercially available creep resistant magnesium alloys AE42 and MRI230D. The creep tests were performed between 175 degrees C and 240 degrees C at stresses between 60 MPa and 120 MPa. From the temperature and stress dependence of the minimum creep rate, the apparent activation energy Q(c) and the stress exponent n for creep were calculated. The concept of a threshold stress was applied. True stress exponents n(t) close to 5 were calculated. Microstructural investigations and phase analysis were performed on the as-cast materials as well as after creep. Fine precipitates could be identified that justified application of the concept of threshold stress. The DieMag422 alloy shows an improvement in creep resistance at low stresses compared with the other two alloys AE42 and MRI230D. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：430 / 438

页数：9

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