Grain refinement of AZ31 magnesium alloy by Al-Ti-C-Y master alloy

详细信息    查看全文

• 作者：Chunxiang XU ; Binfeng LU ; Zhengling LÜ ; Wei LIANG
• 关键词：Al-Ti-C-Y master alloy ; grain refinement ; AZ31 ; magnesium alloy ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：26
• 期：4
• 页码：604-608
• 全文大小：1559 K

文摘

Al-Ti-C-Y master alloy was prepared by combining SHS technique and melting-casting method. The microstructure of master alloy and its grain-refining effect on AZ31 alloy were investigated by means of OM, XRD, SEM and EDS. Experimental results indicated that the prepared master alloy consisted of α-Al, TiAl₃, TiC and Al₃Y phases, and exhibited good grain-refining performance of AZ31 alloy. Morphology of α-Mg changed from coarse dendritic to fine equiaxed and the average grain size of α-Mg matrix reduced from the original 580 to 170 μm after adding 1.0 wt. % master alloy. The grain refining efficiency of Al-Ti-C-Y master alloy on AZ31 alloy was mainly attributed to heterogeneous nucleation of TiC particles and grain growth restriction of Al-Y compound or TiC at grain boundaries.