The role of Al_(2)Y in grain refinement in Mg-Al-Y alloy system

作     者：H.-W.Chang D.Qiu J.A.Taylor M.A.Easton M.-X.Zhang 

作者机构：Division of MaterialsSchool of Mechanical and Mining EngineeringUniversity of QueenslandSt LuciaBrisbaneQLD 4072Australia School of Physics and Materials EngineeringMonash UniversityClaytonVIC 3800Australia 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2013年第1卷第2期

页      面：115-121页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors would like to thank the CSIRO Flagship in Light Metals and the CAST Cooperative Research Centre(CAST CRC)for financial support 

主　　题：Grain refinement Mg alloys Thermal analysis 

摘      要：A series of Mge10(AlþY)alloys with various weight ratios of Al to Y were cast to investigate the role of Al_(2)Y in grain refinement in MgeAleY ternary *** analysis combined with microstructural and EDX analysis was used to determine the phase transformation temperatures during solidification *** results show that when the Al content is below 4 wt%,a peritectic reaction,LþAl_(2)Y/a-Mg,occurs after the intermetallic Al_(2)Y forms directly from the melt as a pro-peritectic *** the Al content is above 4 wt%,an eutectic reaction occurs at a lower *** presence of the pro-peritectic phase can lead to nucleation of a-Mg directly through a peritectic reaction although grain refining efficiency is also closely related to the active particle *** the case where solidification does not involve a peritectic reaction,the growth restriction factor,quantitatively the Q-value,governs the grain refining *** Q-value corresponds to finer grains.