Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面


Transactions of Nonferrous Metals Society of China

Vol. 29    No. 4    April 2019

[PDF Download]        


Effect of pulsed current on AZ31B magnesium sheets during annealing
Kai LIU1,2, Xiang-huai DONG1, Wen SHI1

1. National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China;
2. Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China

Abstract:The annealing tests heated by pulsed current (PC) or furnace for AZ31B magnesium sheets were carried out, and the effects of PC on the microstructure and dislocation density of the alloy were analyzed. The results show that PC strengthens the migration of boundaries, and then the twin grains, most of which distribute in the coarse grains, “spheroidize” to equiaxed grains, thus separating the coarse grains and refining the microstructure. This process homogenizes the initial microstructure and eliminate the typically lamellar twin grains. Moreover, PC also strengthens the dislocation annihilation. When the specimens were annealed by PC at 300 °C for 4 min, the dislocation density was even lower than that annealed by furnaces at 400 °C for 3 h before deformation. Furthermore, dislocation annihilation is enhanced with the increase of peak current density and the decrease of pulsed frequency.


Key words: pulsed current; AZ31B magnesium alloy; annealing; microstructure evolution; twinning; dislocation annihilation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱