Microstructural evolution and grain growth kinetics of GZ31 magnesium alloy

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• 作者：M. Roostaei^a ; ^{miladroustaei68@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; M. Shirdel^a ; ^{mshirdel1989@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; M.H. Parsa^a ; ^b ; ^c ; ^{mhparsa@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; R. Mahmudi^a ; ^b ; ^{mahmudi@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; H. Mirzadeh^a ; ^{hmirzadeh@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Grain growth ; Magnesium alloy ; Rare earth elements ; Activation energy
• 刊名：Materials Characterization
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：118
• 期：Complete
• 页码：584-592
• 全文大小：3966 K

文摘

Grain growth behavior of Mg–3Gd–1Zn (GZ31) magnesium alloy was studied in a wide range of annealing time and temperature to clarify the kinetics of grain growth, microstructural evolution and related metallurgical phenomena. This material exhibited typical normal grain growth mode under annealing conditions with annealing temperature of lower than 300 °C and soaking time of lower than 240 min. However, the abnormality in grain growth was also evident at annealing temperature of 400 °C and 500 °C. The dependence of abnormal grain growth (AGG) at mentioned annealing temperatures upon microstructural features such as dispersed precipitates, which were rich in Zn and Gd, was investigated by optical micrographs, X-ray diffraction patterns, scanning electron microscopy images, and energy dispersive X-ray analysis spectra. The bimodality in grain-size distribution histograms also signified the occurrence of AGG. Based on the experimental data on grain growth obtained by annealing treatments, the grain growth exponent and the activation energy were also figured out.