A three-dimensional heat transfer and material flow-based model using experimentally measured thermo-physical properties has been developed for friction stir welding (FSW) of Cu-0.8Cr-0.1Zr alloy. CuCrZr alloy is a precipitation-hardened copper alloy with good electrical and thermal conductivity and moderate strength at elevated temperatures. The temperature-dependent specific heat, thermal conductivity, and yield strength of the alloy were determined experimentally to develop a reliable and accurate numerical model. The results from numerical model were validated by performing suitable experiments for numerous tool rotational speeds and welding speeds during joining of 3-mm-thick CuCrZr alloy on a dedicated FSW machine. The temperature evolution across the welds was measured using thermocouples. The results from the developed numerical model were validated by comparing it with the measured weld thermal cycles, peak temperatures, and thermo-mechanically-affected zone (TMAZ) for various welds. Validation was also supported with microstructural evidences from the weld nugget zone and TMAZ. The developed model showed the capability to simulate FSW of CuCrZr alloy and predict the important results with reasonably good accuracy

利用Cu-0.8Cr-0.1Zr合金的搅拌摩擦焊（FSW），使用实验测量的热物理性质，建立了基于三维传热和材料流的模型。CuCrZr合金是一种沉淀硬化的铜合金，在高温下具有良好的导电性和导热性，强度适中。通过实验确定了合金的温度相关比热，导热系数和屈服强度，以建立可靠而准确的数值模型。数值模型的结果通过在专用FSW机器上接合3毫米厚的CuCrZr合金期间对众多工具旋转速度和焊接速度进行适当的实验而得到验证。使用热电偶测量焊缝上的温度变化。通过将开发的数值模型与各种焊接的实测热循环，峰值温度和热机械影响区（TMAZ）进行比较，可以验证其结果。焊接熔核区和TMAZ的微观结构证据也支持验证。所开发的模型具有模拟CuCrZr合金FSW的能力，并能以相当好的精度预测重要结果