Grain refinement of AZ31 magnesium alloy by Al-Ti-C-Y master alloy |
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Authors: | XU Chunxiang LU Binfeng L Zhengling LIANG Wei |
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Affiliation: | XU Chunxiang,LU Binfeng,L(U) Zhengling,LIANG Wei |
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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. |
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Keywords: | Al-Ti-C-Y master alloy grain refinement AZ31 magnesium alloy rare earths |
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