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Grain refinement of Mg-Li-Al cast alloys by adding typical master alloys |
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| Authors: | Bin JIANG Qing-shan YANG Ming-xing ZHANG Dong QIU Rui-hong LI and Fu-sheng PAN |
| Institution: | Bin JIANG~(1,2),Qing-shan YANG~2,Ming-xing ZHANG~3,Dong QIU~3,Rui-hong LI~2,Fu-sheng PAN~(1,2) 1.National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China,2.College of Materials Science and Engineering,3.Division of Materials,School of Mechanical and Mining Engineering,The University of Queensland,St Lucia,QLD 4072,Australia |
| Abstract: | Commercial Al-3Ti-1C and Al-5Ti-1B master alloys were added in order to refine the grains of Mg-Li-Al alloys. The effects of their addition levels on grain refinement of Mg-Li-Al cast alloy were investigated and the mechanism of the grain refinement was discussed. The results showed that the addition of Al-3Ti-1C master alloy reduced the grain size of LA141 cast alloy from 900 μm to 400 μm, while the addition of Al-5Ti-1B master alloy reduced the grain size of LA51 cast alloy from 500 μm to 240 μm. The grain refining mechanism was the heterogeneity nucleation of TiC and TiB2, because of less than 10% mismatches of TiC/β-Li and TiB2/α-Mg. |
| Keywords: | magnesium lithium alloy master alloy grain refinement |
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