High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy

Creep and superplasticity were investigated by testing a fine-grained extruded Mg–Zn–Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 30...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 28; no. 5; pp. 407 - 413
Main Authors Spigarelli, S., Mehtedi, M. El, Regev, M., Gariboldi, E., Lecis, N.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2012
Subjects
Creep
Creep (materials)
Dislocation mobility
Extrusion
Magnesium alloy
Magnesium base alloys
Mathematical models
Strain rate
Stresses
Superplasticity
晶界滑移
测试调查
温度范围
超塑性行为
锆合金
镁合金
高应变率
高温蠕变
Creep
Superplasticity
Magnesium alloy
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Summary:Creep and superplasticity were investigated by testing a fine-grained extruded Mg–Zn–Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 300 ℃, where superplasticity was attained even under relatively high strain rates （5×10-3 s-1 ）. By contrast, for lower temperatures, the straining process was controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was developed to describe the strain rate dependence on applied stress.
Bibliography:Creep and superplasticity were investigated by testing a fine-grained extruded Mg–Zn–Zr magnesium alloy under a wide range of applied stress in the temperature range between 100 and 300 ℃. Grain boundary sliding became the dominating mechanism at 200 ℃, leading to a true superplastic behaviour at 300 ℃, where superplasticity was attained even under relatively high strain rates （5×10-3 s-1 ）. By contrast, for lower temperatures, the straining process was controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was developed to describe the strain rate dependence on applied stress.
S. Spigarelli 1） , M. El Mehtedi 1） , M. Regev 2） , E. Gariboldi 3） and N. Lecis 3） 1） Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universit Politecnica delle Marche, Via Brecce Bianche, Ancona 60131, Italy 2） Mechanical Engineering Dept., ORT Braude College, Karmiel 21982, Israel 3） Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy
21-1315/TG
Creep; Superplasticity; Magnesium alloy
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1005-0302
1941-1162
DOI:10.1016/S1005-0302(12)60076-0