主要是采用盲孔法和拉伸试验法研究了冷热循环处理对ZL205A过渡环应力消除和力学性能的影响。结果表明:冷热循环处理使得过渡环的残余应力有所减小,且第二次冷热循环处理后,残余应力下降了近20%。经冷热循环处理后,ZL205A由于在低温下铝基体晶格发生收缩,导致空位浓度降低,且在深冷低温下原子扩散十分困难,在基体周围近距离析出了第二相,呈弥散分布。随着深冷处理时间的延长,析出的第二相增多,其分布也更加均匀、致密,晶粒得到细化从而提高了材料的抗拉强度和屈服强度。 Blind hole method and tensile test method are mainly used to study the effect of hot and cold cycle on stress relief and mechanical properties of ZL205A transition ring. The results show that the residual stress decreases by nearly 20% after the second cooling and heating cycle. After hot and cold cycle treatment, ZL205A has the effect of reducing the vacancy concentration due to the shrinkage of the lattice of the aluminum matrix at low temperature, and it is very difficult for atoms to diffuse at cryogenic temperature. A second phase precipitates near the matrix with a diffuse distribution. With the prolonging of cryogenic treatment time, the second phase precipitated increased, its distribution was more uniform and dense, and the grains were refined to improve the tensile strength and yield strength of the material.