Study On Melt Heat Treating And Solidification Of CuSb And SnSb Alloy

By diffraction and measuring structure-sensitive parameters, it has been found that some topology and chemical short-range orders (CSRO) existed in liquid alloys. Especially for compound-forming melts, there are more complex interactions between like-atoms and unlike-atoms.In this paper, the effects of melt heating treating on solidification of Sn-Sb alloy and Cu-Sb alloy are investigated by forced cooling and common solidification method. The results are as follows:First, the effects of different melt heat treating on solidification behavior and solidification structures of Cu-Sb alloy are investigated. By the contrast of solidification structures and the analysis of solidification behavior, it is found that the rate of cooling affects solidification remarkably, but the effects of different superheat degrees on solidification are complex, so the preference of holding temperature is blindfold.Then, we investigate the effects of temperature induced liquid-liquid structure transition on solidification of Sn-Sb alloy. The results show that the CSROs have significant effects on solidification. Especially, the CSROs with crystal structure in melts are coherent with the primary compound phase in solidification, which decrease super-cooling degrees in solidification and promote nucleating and growing of primary phase, further to inhibit peritectic reaction and finally influence the solidification structure.In addition, the kinetics of liquid-liquid structure transition process in Sn-Sb melt by the measurements of electrical resistivity is investigated to helping preferences of holding temperature in the solidification experiment of Sn-Sb alloy.