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. 22    No. 7    July 2012

[PDF Download]        


Grain refining technique of AM60B magnesium alloy by MgCO3
CHEN Ti-jun, WANG Rui-quan, HUANG Hai-jun, MA Ying, HAO Yuan

Key Laboratory of Gansu Advanced Nonferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China

Abstract:The effects of grain refining parameters on microstructure of AM60B magnesium alloy with MgCO3 were investigated and then a refining technique was developed. Simultaneously, the corresponding mechanisms were discussed. The results indicate that increasing addition temperature of MgCO3 or pouring temperature is beneficial for obtaining fine grains. There is an optimal addition amount of 1.2% at the addition temperature of 790 °C. Prolonging holding time at 790 °C will increase grain size. The grain refining technique that 1.2% MgCO3 is added at 790 °C followed by holding for 10 min and pouring can decrease the grain size from 348 µm of the un-refined alloy to 69 µm. The nucleation substrates are actually the Al4C3 particles formed from reactions between the MgCO3 and alloying elements in the melt. Besides the heterogeneous nucleation regime, growth restriction of the Al4C3 particles agglomerated at growing front is the other mechanism.


Key words: AM60B magnesium alloy; grain refinement; MgCO3

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