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首页> 外文期刊>Materials Science and Engineering >Micro-plastic deformation behavior of Al-Zn-Mg-Cu alloy subjected to cryo-cycling treatment
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Micro-plastic deformation behavior of Al-Zn-Mg-Cu alloy subjected to cryo-cycling treatment

机译：低温循环处理Al-Zn-Mg-Cu合金的微塑性变形行为

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摘要

The micro-plastic deformation behavior of Al-Zn-Mg-Cu alloy subjected to cryo-cycling treatment was investigated experimentally in the present work. Micro-plastic deformation was produced by continuous loading-unloading method with applied stress far below the yield strength of this alloy, and the deformation characteristics of grains were detected by Optical Microscope (OM) and Scanning Electron Microscope (SEM). The results showed that cryo-cycling treatment reduced the residual strain (epsilon(p)) after each cycle of loading-unloading, and the degree of grain deformation was decreased apparently, which indicated that cryo-cycling treatment enhanced the capacity of resistance to micro-plastic deformation. Transmission Electron Microscope (TEM) was employed to reveal the mechanisms of cryo-cycling treatment on Al-Zn-Mg-Cu alloy. The results showed that higher content of homogenous eta phases precipitated in the matrix and grain boundaries of Al-Zn-Mg-Cu alloy after cryo-cycling treatment. Meanwhile, no clear precipitate-free zones (PFZs) can be observed in the microstructure of cryo-treated specimen. The changes of microstructure had great contribution to improve the pinning effect of dislocations during micro-plastic deformation. Internal stress was released by the cryo-cycling treatment which was demonstrated by the in-suit cryogenic X-Ray (XRD) measurement, as a result, the stability of dislocation was improved. Cryo-cycling treatment had no obvious influence on the tensile strength and yield strength of Al-Zn-Mg-Cu alloy, while elongation and fracture toughness were improved by the extent of 7% and 10.3% respectively, compared to those of the untreated specimen.
机译：在本工作中，对经过低温循环处理的Al-Zn-Mg-Cu合金的微观塑性变形行为进行了实验研究。通过连续加载-卸载方法产生微塑性变形，施加的应力远低于该合金的屈服强度，并通过光学显微镜（OM）和扫描电子显微镜（SEM）检测晶粒的变形特性。结果表明，低温循环处理降低了每个加载-卸载循环后的残余应变（ε（p）），并且晶粒变形程度明显降低，这表明低温循环处理增强了抗微生物能力。 -塑性变形。利用透射电子显微镜（TEM）揭示了Al-Zn-Mg-Cu合金的低温循环处理机理。结果表明，经过低温循环处理后，Al-Zn-Mg-Cu合金的基体和晶界中均析出了较高的均相η相。同时，在冷冻处理的样品的微观结构中没有观察到清晰的无沉淀区（PFZs）。微观结构的变化对改善微塑性变形过程中位错的钉扎效果有很大的贡献。通过体内低温X射线（XRD）测量证明，通过低温循环处理释放了内部应力，结果，提高了位错的稳定性。低温循环处理对Al-Zn-Mg-Cu合金的拉伸强度和屈服强度没有明显影响，而伸长率和断裂韧性分别比未处理试样提高了7％和10.3％。 。

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