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Ce元素对Mg-6Zn-1Mn变形镁合金显微组织和力学性能的影响

ISSN号：1003-6326
期刊名称：《中国有色金属学报：英文版》
时间：0
分类：TG146[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]重庆大学材料科学与工程学院,重庆400045, [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044, [3]重庆科技学院冶金与材料工程学院,重庆401331
相关基金：Project（2007CB613700）supported by the National Basic Research Program of China; Project（2007BAG06B04）supported by the National Key Technology R＆D Program; Project（CSTC 2009AB4008）supported by the Chongqing Sci＆Tech Program; Project（50725413）supported by the National Natural Science Foundation of China; Project（CDJXS10132202）supported by the Fundamental Research Funds for the Central Universities China

作者：张丁非[1,2], 齐福刚[1,2], 兰伟[3], 石国梁[1,2], 赵霞兵[1,2]

关键词： Mg-6Zn-1Mn合金, 铈, 显微组织, 力学性能, Mg-6Zn-1Mn alloy, cerium, microstructure, mechanical properties

中文摘要：

利用光学显微镜、X射线衍射、扫描电镜和差热分析等手段研究添加Ce对Mg-6Zn-1Mn镁合金在不同状态下的微观组织和相组成的影响,并对合金的室温力学性能进行测试和比较。结果表明：添加的Ce元素以Mg12Ce相存在于合金中,主要分布在晶界和枝晶间,铸态晶粒得到细化;添加Ce元素能够明显地提高挤压态Mg-6Zn-1Mn合金的屈服强度和伸长率,这是由于热挤压过程中弥散分布在晶界上的Mg12Ce相能够有效钉扎晶界,抑制再结晶晶粒长大,从而得到更加细小的热变形晶粒组织;然而,添加Ce元素恶化了时效态Mg-6Zn-1Mn合金的力学性能,这是因为热处理不能使这些Mg12Ce相固溶于基体中,在拉伸断裂时Mg12Ce相表面形成微裂纹,导致力学性能下降。

英文摘要：

The effects of Ce addition on the microstructure of Mg-6Zn-1Mn alloy during casting, homogenization, hot extrusion, T4, T6 and T4＋two-step aging were investigated. The mechanical properties of alloys with and without Ce were compared. The results showed that Ce had an obvious effect on the microstructure of ZM61-0.5Ce alloy by restricting the occurrence of dynamic recrystallization and restraining the grain growth during extrusion and heat treatment subsequently. A new binary phase Mg 12 Ce was identified in ZM61-0.5Ce alloy, which distributed at grain boundaries and was broken to small particles distributed at grain boundaries along extrusion direction during extrusion. The mechanical properties of as-extruded ZM61-0.5Ce alloy were improved with the addition of Ce. The improved tensile properties of as-extruded ZM61-0.5Ce alloy were due to the finer grain sizes as compared to ZM61 alloy. However, the UTS and YS decreased severely and the elongation increased when ZM61-0.5Ce was treated by T6 and T4＋two-step aging. Brittle Mg 12 Ce phase, which was distributed at the grain boundary areas and cannot dissolve into the Mg matrix after solution treatment, became crack source under tensile stress.