【摘 要】
：
The growth mechanism of the peritectic η phase involving the peritectic reaction and peritectic transformation in Cu-70%Sn alloy was investigated under directi
【机 构】
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State Key Laboratory of Solidification Processing
论文部分内容阅读
The growth mechanism of the peritectic η phase involving the peritectic reaction and peritectic transformation in Cu-70%Sn alloy was investigated under directional solidification. The results show that a major growth mechanism in thickening of the peritectic η-layer is not the peritectic reaction but the peritectic transformation. The transformation temperature and isothermal time play crucial roles in determining the volume fraction and the thickness of the peritectic η phase. With the increase of the temperature and isothermal time, the volume fraction of the peritectic η phase increases. The regressed data show that the relationship between the thickness of η phase (△x) and the transformation temperature (T) meets the following equation ln △x=6.5-16731/T. Additionally, there exists a relationship between the thickness of the η phase (△x) and the isothermal time (t) at the 9 mm solidification distance below the peritectic reaction interface, △x =0.72t1/2, which is consistent with the theoretical model.
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