【摘要】 用粉末冶金工艺制备了Al-Si共晶合金与Zr-2合金扩散偶,研究了不同等温热处理温度和时间条件下扩散偶的相容性。采用扫描电镜(SEM)、能谱分析(EDS)和X射线衍射(XRD)技术分析了扩散偶界面处的微观形貌和元素分布,讨论了扩散层形成机理。结果表明,环境温度及材料状态显著影响扩散偶之间的相容性。650℃时,液态Al-Si合金对Zr-2合金的浸润和扩散形成了较明显的以Zr3A1化合物为主的扩散层;560℃时,扩散元素之间仅产生固态扩散,形成的扩散层很薄;350℃时,扩散系数更小,几乎未发生扩散和形成扩散层,Al-Si共晶合金与Zr-2合金之间具有良好的相容性。更多还原

【Abstract】 To investigate the compatibility of Al-Si eutectic alloy and Zr-2 at different heat-treatment temperature for different time,the couple of them was prepared by powder-metallurgy method.The micro-structure and element distribution have been measured with SEM,EDS,and XRD.It is shown that the heat-treatment temperature and the state of Al-Si alloy greatly influence the compatibility.At 650℃×40h,the dramatic diffusion layer has been formed due to the infiltration and diffusion of liquid Al-Si alloy.At 560℃×240h,the diffusion layer is very thin because there exists a solid state diffusion only.At 350℃×240h,due to a much smaller diffusion coefficient,almost no diffusion layer occurs,which means a good compati-bility between Al-Si eutectic alloy and Zr-2 at this temperature.更多还原