Developing constitutive equations of flow stress for hot deformation of AZ31 magnesium alloy under compression, torsion, and tension

被引：23

作者：

Mirzadeh, Hamed ^{[1
]}

机构：

[1] Univ Tehran, Sch Met & Mat Engn, Coll Engn, POB 11155-4563, Tehran, Iran

来源：

INTERNATIONAL JOURNAL OF MATERIAL FORMING | 2019年 / 12卷 / 04期

关键词：

Hot working; Flow stress; Deformation mode; Thermomechanical processing; Constitutive modeling; DYNAMIC RECRYSTALLIZATION; MICROSTRUCTURE EVOLUTION; CONTROLLING MECHANISMS; PROCESSING MAPS; PLASTIC-FLOW; STRAIN-RATE; AS-CAST; BEHAVIOR; WORKING; CREEP;

D O I：

10.1007/s12289-018-1440-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A comparative study was carried out on AZ31 (Mg-3Al-1Zn) magnesium alloy to understand the effect of deformation mode on the hot flow stress. Accordingly, the peak flow stress resulted from hot compression, hot tension, and hot torsion tests were correlated to the Zener-Hollomon parameter using the Sellars-McTegart approach. Based on the analysis, by applying the lattice self-diffusion activation energy of magnesium (135kJ/mol) as the deformation activation energy, the hyperbolic sine exponents were determined to be similar to 5. Consequently, by consideration of creep exponent of 5, some reliable semi-empirical constitutive equations were proposed for high-temperature deformation of AZ31 alloy and the effect of deformation mode was quantified.

引用

页码：643 / 648

页数：6

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