A carbon nanotubes (CNTs)-reinforced Al–Mg–Si alloy composite was made and shot peened. After shot peening, a compressive residual stress field was generated in shot peened layer. The change law of residual stress and microhardness with annealing time at elevated temperatures (150 °C, 200 °C, and 250 °C) was investigated. An Al–Mg–Si alloy without CNT addition is prepared in the same process to compare with the CNTs/Al–Mg–Si alloy composite to verify the effect of CNTs on residual stress relaxation. Results showed that for the both materials, macro and micro residual stresses in the shot-peened layers decreased firstly due to thermal recovery and then trend to be stable during annealing process. Increasing the annealing temperature could accelerate the speed of stress release and increase the decrement rate. Specially, the addition of CNTs could improve the thermal stability of the macro residual stress created by shot peening.

制成了碳纳米管（CNTs）增强的Al-Mg-Si合金复合材料，并对其进行了喷丸处理。喷丸处理后，在喷丸处理层中产生压缩残余应力场。研究了在高温（150°C，200°C和250°C）下残余应力和显微硬度随退火时间的变化规律。在相同的过程中制备了不添加CNT的Al-Mg-Si合金，以与CNTs / Al-Mg-Si合金复合材料进行比较，以验证CNTs对残余应力松弛的影响。结果表明，对于这两种材料，喷丸硬化层中的宏观和微观残余应力首先由于热恢复而降低，然后在退火过程中趋于稳定。升高退火温度可以加快应力释放的速度并增加减量速率。特别，