挤压前的时效处理对AZ80镁合金组织和力学性能的影响（英文）

发布时间：2018-04-20 02:09

本文选题：镁合金 + 再结晶　；参考：《稀有金属材料与工程》2017年07期

【摘要】：主要研究了挤压前的时效处理工艺对AZ80镁合金显微组织和力学性能的影响,同时利用扫描电子显微镜对试样断口进行分析。结果表明:挤压前时效处理可以明显细化晶粒;时效过程中析出的Mg_(17)Al_(12)粒子弥散分布在晶界处,在动态再结晶过程中起到阻碍晶界移动、阻止晶粒长大、细化组织的作用;随着时效时间的延长或者时效温度的升高,晶粒细化效果减弱;对时效后合金进行挤压,试样的屈服强度、抗拉强度和延伸率均提高。通过对断口形貌的分析发现,早期裂纹产生于晶界处粗大的第二相周围,导致了拉伸过程中延伸率的下降。挤压前时效处理对AZ80的强化效果为高性能镁合金的设计和开发提供了一种全新的思路。
[Abstract]:The effect of aging treatment before extrusion on microstructure and mechanical properties of AZ80 magnesium alloy was studied. The fracture surface of AZ80 magnesium alloy was analyzed by scanning electron microscope (SEM). The results show that the aging treatment before extrusion can obviously refine the grains, and the MgS17 / AlS-1) particles distributed at the grain boundaries during aging, which hinder the movement of grain boundaries, prevent the grain growth and refine the microstructure during the dynamic recrystallization. With the prolongation of aging time or the increase of aging temperature, the grain refinement effect is weakened, and the yield strength, tensile strength and elongation of the alloy after aging are increased. By analyzing the fracture morphology, it is found that the early cracks occur around the coarse second phase at grain boundaries, which leads to the decrease of elongation during the tensile process. The strengthening effect of pre-extrusion aging treatment on AZ80 provides a new way for the design and development of high performance magnesium alloys.
【作者单位】：重庆大学材料科学与工程学院;重庆大学国家镁合金材料工程技术研究中心;重庆市科学技术研究院;
【基金】：National Great Theoretic Research Project(2013CB632200) National Natural Science Foundation of China(51474043) Chongqing Municipal Government Project(CSTC2013JCYJC60001)
【分类号】：TG146.22;TG166.4;TG379

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