Abstract
The effects of melt mixing with high-temperature and low-temperature melts on Au-20Sn(mass fraction,%)eutectic alloy solidification microstructures have been studied.The solidification microstructure evolutions of Au-20Sn eutectic alloy by the temperatures of high-temperature melt were investigated.Melt mixing with high-temperature and low-temperature melts can effectively improve the solidification microstructure of Au-20Sn alloy.Adopting an appropriate melt mixing condition,which is high-temperature melt with 350℃and low-temperature melt with 283℃,the precipitation of primary phaseζ'-Au_5Sn will be inhibited during solidification process,and the full lamellar eutectic microstructure was obtained.When the temperature of high-temperature melt is high (360℃)or low(340℃),the primary phaseζ'-Au_5Sn will also exist in the solidification microstructure. Melt mixing with high-temperature and low-temperature melts can effectively decrease the Au atom segregation and modify the precipitation behavior of primary phaseζ'-Au_5Sn.The compressive behavior at 220℃exhibits a low yielding stress and a low stress platform for the alloy with full lamellar eutectic microstructure prepared by melt mixing,which indicates that the hot-workability of Au-20Sn alloy can be improved by melt mixing.
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