Deformation Behavior of AM30 Magnesium Alloy
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JMEPEG (2018) 27:4900–4910 https://doi.org/10.1007/s11665-018-3567-4
Deformation Behavior of AM30 Magnesium Alloy A. Bisht, V. Yadav, S. Suwas, and U.S. Dixit (Submitted December 13, 2017; in revised form July 22, 2018; published online August 13, 2018) In this study, deformation behavior of AM30 magnesium alloy is investigated in the hot working regime and empirical relations are developed. Compression tests were performed in the 0.001-10 s21 strain rate range and 423-623 K temperature range to obtain the mechanical properties. The compression curves were fitted using two approaches, viz. piecewise linear fitting and a Johnson–Cook type relation. Piecewise linear fit is found to be appropriate for describing the mechanical behavior in the dynamic recrystallization (DRX) regime as compared to the proposed Johnson–Cook type relation. The Johnson–Cook type model is not able to capture the essential feature of DRX, particularly at high strain rates. Keywords
AM30 magnesium alloy, compression test, deformation energy, dynamic recrystallization, empirical relation, microstructure
1. Introduction AM30 magnesium alloy is an important alloy of magnesium that has been developed for automobile application. This alloy is characterized by good deformability and durability at high temperature. However, the formability of AM30 magnesium alloy is less than that of steel and aluminum alloys at room temperature due to hexagonal-close-packed (HCP) crystal structure of a-Mg, which is a predominant phase in AM30 (Ref 1). The limitation of formability has been a major difficulty to manufacture micro- or macro-components for aerospace and automotive industries. In view of this, the present work aims to study the deformation behavior of AM30 magnesium alloy at various temperatures and strain rates. Investigations related to the deformation of AM30 magnesium alloy have been carried out by a number of researchers. Jiang et al. (Ref 2) carried out the uniaxial compression test of AM30 magnesium alloy at three levels of strain rate, viz. 0.1, 0.01 and 0.001 s1, for temperatures ranging from 25 to 300 C. They observed that the flow stress decreased with temperature and increased with strain rate. Jiang et al. (Ref 3) studied the twinning for AM30 and AZ31 magnesium alloys under uniaxial, compression and ring hoop tension tests. The flow stresses measured during compression and ring hoop tension tests were less than that during uniaxial tensile test at low strain, but increased significantly with deformation. Luo and Sachdev (Ref 1) also studied the formability of AM30 and AZ31 magnesium alloys at different temperatures and strain rates and found that the ductility of AM30 magnesium alloy is 50% more at room temperature and 30% more at 200 C than that of AZ31 magnesium alloy. They also observed the absence A. Bisht and S. Suwas, Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India; V. Yadav, Department of Mechanical Engineering, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, In
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