时效处理对含Gd的AZ31镁合金显微组织和力学性能的影响  

Effect of Aging Treatment on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Containing Gd

作　　者：渠治波 张金玲[1,2] 张晓敏 孙文君 戴玥 王社斌[1,2] QU Zhibo;ZHANG Jinling;ZHANG Xiaomin;SUN Wenjun;DAI Yue;WANG Shebin(Sch ool of Material Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]新材料界面科学与工程教育部重点实验室,山西太原030024

出　　处：《热加工工艺》2021年第10期122-126,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51371122);国家自然科学基金项目(61604104);山西省自然科学基金项目(201801D221138)。

摘　　要：研究了时效处理对含Gd的AZ31镁合金显微组织和力学性能的影响,通过SEM,EDS对合金的显微结构进行了表征。结果表明,AZ31镁合金中添加Gd后,优先形成了高熔点的Al2Gd相,抑制了Mg17Al12相的生成;且随Gd含量的增加铸态合金的显微硬度呈现先增加后减小的趋势。对AZ31-xGd合金进行时效硬度分析,由时效硬化曲线确定了最佳T6处理工艺(500℃,16 h)+(200℃,32 h)。在时效过程中,Al2Gd相从颗粒状变为针状,再转变为短杆状最后团聚变成块状。铸态和时效态合金的力学性能随Gd含量的增加呈先增加后减小的趋势,这是由于时效析出的Al2Gd相具有弥散强化和析出强化的作用。The effects of aging treatment on the microstructure and mechanical properties of AZ31 magnesium alloy containing Gd were studied.The microstructure of the alloy was characterized by SEM and EDS.The results show that,when Gd is added to AZ31 magnesium alloy,Al2Gd phase with high melting point is formed,which inhibits the formation of Mg17Al12 phase.The microhardness of cast alloy increases first and then decreases with the increase of Gd content.The aging hardness of AZ31-xGd alloys was analyzed and the optimum T6 treatment process(500℃,16 h)+(200℃,32 h)was determined through the aging hardening curve.During the aging process,the phase of Al2Gd changes from granular to acicular,then to short rod and finally agglomerate to block.The mechanical properties of cast and aged alloys increase first and then decrease with the increase of Gd content,which is due to the dispersion strengthening and precipitation strengthening of Al2Gd phase during aging.

关 键 词：AZ31-xGd镁合金 时效处理 显微组织 弥散强化 析出强化 

分 类 号：TG166.4[金属学及工艺—热处理]