Grain refinement of AZ31 magnesium alloy by Al-Ti-C-Y master alloy
来源期刊：JOURNAL OF RARE EARTHS2008年第4期
论文作者：LIANG Wei XU Chunxiang L LU Binfeng
Key words：Al-Ti-C-Y master alloy; grain refinement; AZ31; magnesium alloy; rare earths;
Abstract: 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.
LIANG Wei1，XU Chunxiang1，L2，LU Binfeng1
(1.School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.U) Zhengling(School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Abstract: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.
Key words:Al-Ti-C-Y master alloy; grain refinement; AZ31; magnesium alloy; rare earths;
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