Effect of Ca and Rare Earths on Compressive Creep Behavior of Mg-4Al Alloy
The effect of Ca and rare earths on compressive creep behavior of Mg-4Al alloy was investigated with a special apparatus.The microstructures were analyzed by OM, XRD, SEM and EDS before and after compressive creep test.The results reveal that a small amount of Ca was added into AE41 alloy in order to refine the crystalline structure and improve the creep resistance.Comparing with NdPr rare earths alloy, the creep resistance of LPC rare earths alloy decreases, but is still better than AE41 alloy.The as-cast microstructure of AE41 alloy is mainly composed of α-Mg matrix and Al11Nd3 phase.The acicular Al11Nd3 phase is prone to decompose at high temperature, which leads to the poor creep resistance of AE41 alloy.The acicular Al11RE3 phase is gradually replaced by Al2Ca and Al2RE with Ca addition into AE41.LPC rare-earth mixture is in cluster at grain boundaries so that the creep resistance is worse than that of alloy containing NdPr rare-earth mixture.
AE41 alloy Ca Rare Earths compressive creep creep resistance
DU Chun-ping XU Dao-fen WANG Bin-wu
Guilin University of Aerospace Technology,Guilin Guangxi 541104,China
国际会议
the 3nd International Conference on Digital Manufacturing & Automation (第三届数字制造与自动化国际会议(ICDMA 2012))
桂林
英文
457-461
2012-08-01（万方平台首次上网日期，不代表论文的发表时间）