Grain-scale creep processes in Mg-Al-Ca base alloys: Implications for alloy design

被引：44

作者：

Saddock, N. D. ^{[1
,4
]}

Suzuki, A. ^{[1
,2
]}

Jones, J. W. ^{[1
]}

Pollock, T. M. ^{[1
,3
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Gen Elect Global Res, Niskayuna, NY 12309 USA

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[4] ATI Allvac, Monroe, NC 28110 USA

来源：

SCRIPTA MATERIALIA | 2010年 / 63卷 / 07期

关键词：

Mg-Al-Ca; Casting; Creep; Solidification; MAGNESIUM ALLOYS; MICROSTRUCTURE; PRECIPITATION; PHASES;

D O I：

10.1016/j.scriptamat.2010.03.055

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Grain-scale creep straining processes in die-cast and permanent-mold-cast Mg-Al-Ca alloys have been studied. High-temperature strain mapping with electron backscattered diffraction analysis reveals favorably oriented grains deforming preferentially during creep. Displacements of microstructural-scale markers applied along grain boundaries and within grain interiors demonstrate no significant contribution of grain boundary sliding to creep. Creep rates at 175 degrees C display an inverse dependence on grain size, with fine-grained die-cast material possessing the highest creep resistance. Implications for the design of future alloys are discussed. (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：692 / 697

页数：6

共 28 条

[1]

Bakke P, 2005, MAGNESIUM TECHNOLOGY 2005, P291

[2] Elevated Temperature Mg-Al-Sr: Creep Resistance, Mechanical Properties, and Microstructure [J].

Eric Baril ;

Pierre Labelle ;

Mihriban Pekguleryuz .

JOM, 2003, 55 (11) :34-39

[3] A method for measuring microstructural-scale strains using a scanning electron microscope:: Applications to γ-titanium aluminides [J].

Biery, N ;

De Graef, M ;

Pollock, TM .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (10) :2301-2313

[4] Influence of microstructure and strain distribution on failure properties in intermetallic TiAl-based alloys [J].

Biery, NE ;

De Graef, M ;

Pollock, TM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 319 :613-617

[5]

BRAUN AH, 1979, METALS HDB, V2, P553

[6]

DARGUSCH M, 1998, MINING MINERALS MAT, P164

[7]

LUO A, 1998, 980086 SAE

[8] Recent magnesium alloy development for elevated temperature applications [J].

Luo, AA .

INTERNATIONAL MATERIALS REVIEWS, 2004, 49 (01) :13-30

[9] Creep and microstructure of magnesium-aluminum-calcium based alloys [J].

Luo, AA ;

Balogh, MP ;

Powell, BR .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2002, 33 (03) :567-574

[10]

LUO AA, 2003, MATER SCI FORUM, V57, P419

← 1 2 3 →