Melting characteristics of magnesium—lithium alloys |
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| Authors: | R K Singh B Sudhakar C R Chakravorty S N Tiwari |
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| Affiliation: | 1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500 258, India;2. Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India |
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| Abstract: | Mg-Li-Al alloys containing 4–14 wt% Li and 1.5 wt% Al have been prepared by melting Mg/Mg-Al master alloy and Li separately under MgCl2 + KCl + MgO + CaF2 and LiCl + LiF flux covers, respectively, and mixing the two together. The observed lithium loss and the pick-up of impurity elements in the melt have been correlated with various physico-chemical phenomena occurring during melting. The effect of holding time on melt composition was also examined. The results indicate that it is possible to control the alloy composition within specified limits by the selection of proper melting fluxes and crucible materials and by restricting the holding time to the minimum possible. These findings suggest that flux-cover melting is a viable route for the production of sound cast ingots of highly reactive magnesium—lithium alloys. |
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| Keywords: | Zn-Al base alloys ZA27 alloy antimony Sb |
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