为了明确固溶、时效、以及固溶＋时效处理对挤压变形Al-4%Mg-1.0%Ce合金循环变形行为的影响,针对不同处理状态的挤压变形Al-4%Mg-1.0%Ce合金进行了总应变幅控制下的低周疲劳实验。结果表明,挤压变形Al-4%Mg-1.0%Ce合金经过热处理后,循环变形抗力降低;不同处理状态的挤压变形Al-4%Mg-1.0%Ce合金均可呈现出循环硬化和循环稳定;在较高的外加总应变幅下,不同处理状态的挤压变形Al-4%Mg-1.0%Ce合金均会发生动态应变时效;固溶处理可以显著降低挤压变形Al-4%Mg-1.0%Ce合金的应变疲劳参数K＇和n＇,时效处理能够明显提高合金的K＇和n＇,而固溶＋时效处理对合金的K＇和n＇影响不大。
In order to clarify the influence of solid solution, aging and solid solution plus aging treatments on cyclic deformation behavior of extruded A14% Mg-1.0% Ce alloy, the low-cycle fatigue tests controlled by total strain amplitude were carried out for the alloy in different treating states. The results show that the cyclic deformation resistance of the extruded A14% Mg-1.0% Ce alloy decreases after heat treatments. The extruded A14% Mg-l. 0% Ce alloy in different treating states exhibits cyclic hardening and stability. At higher applied total strain amplitudes, the dynamic strain aging （DSA） occurs for the extruded Al-4% Mg-1.0% Ce alloy in different treating states. The solid solution treatment reduces the strain fatigue parameters K＇ and n＇ of the alloy significantly, and the aging treatment enhances the K＇ and n＇ of the alloy obviously. Meanwhile, the solid solution plus aging treatment has little effect on the K＇ and n＇ of the alloy.
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