EFFECTS OF MELT MIXING WITH HIGH AND LOW TEMPERATURE MELTS ON SOLIDIFACATION MICROSTRUCTURES OF Au-20Sn EUTECTIC ALLOY
Received date: 2012-06-20
Revised date: 2012-07-20
Online published: 2012-11-11
Supported by
Supported by National Natural Science Foundation of China (Nos.50964014 and 51161024)
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 phase ζ'-Au5Sn 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 phase ζ'-Au$_{5}$Sn 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 phase ζ'-Au5Sn. 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.
Key words： melt mixing; Au-20Sn eutectic; alloy; solidification microstructure; primary phase
GUO Deyan SONG Jiajia CAI Liang MAO Yong . EFFECTS OF MELT MIXING WITH HIGH AND LOW TEMPERATURE MELTS ON SOLIDIFACATION MICROSTRUCTURES OF Au-20Sn EUTECTIC ALLOY[J]. Acta Metall Sin, 2012 , 48(11) : 1387 -1393 . DOI: 10.3724/SP.J.1037.2012.00365
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