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

材料科学技术（英文）, 2012, 28(5): 407-413.

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

^1, , ^2, , ^3, , ^4, , ^5,

1.Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universita Politecnica delle Marche, Via Brecce Blanche, Ancona 60131, Italy

2.Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universita Politecnica delle Marche, Via Brecce Blanche, Ancona 60131, Italy

3.Mechanical Engineering Dept., ORT Braude College, Karmiel 21982, Israel

4.Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

5.Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

基金项目: partly financially supported by Ort Braude College of Engineering, Israel

关键词：超塑性行为 , 高温蠕变 , 镁合金 , 锆合金 , 温度范围 , 高应变率 , 测试调查 , 晶界滑移

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

S. Spigarelli ^1, , M. El Mehtedi ^2, , M. Regev ^3, , E. Gariboldi ^4, , N. Lecis ^5,

1.Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universita Politecnica delle Marche, Via Brecce Blanche, Ancona 60131, Italy

2.Dipartimento di Ingegneria Industriale e Scienze Matematiche, Universita Politecnica delle Marche, Via Brecce Blanche, Ancona 60131, Italy

3.Mechanical Engineering Dept., ORT Braude College, Karmiel 21982, Israel

4.Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

5.Dipartimento di Meccanica, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

Keywords： Creep , Superplasticity , Magnesium 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 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.

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