镁稀土合金疲劳性能的研究进展  

Research Progress in Fatigue Properties of Mg-RE Alloys

作　　者：戚方舟 张小龙[1,2] 吴国华 张亮[1,2] 刘文才[1,2] 丁文江[1,2] Qi Fangzhou;Zhang Xiaolong;Wu Guohua;Zhang Liang;Liu Wencai;Ding Wenjiang(National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiaotong University;The State Key Laboratory of Metal Matrix Composites,Shanghai Jiaotong University)

机构地区：[1]上海交通大学轻合金精密成型国家工程中心,上海200240 [2]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《特种铸造及有色合金》2021年第5期629-637,共9页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(U2037601,51775334,51821001);国家重点研发计划资助项目(2016YFB0701205)。

摘　　要：作为一种超轻质、比强度高、耐热性好的工程结构材料,镁稀土合金在航空航天、空天飞行器、轨道交通等领域的应用前景广阔,而实际服役过程中承受的交变载荷对其疲劳性能提出了严苛的要求。为了保证承力结构件的耐久性和安全性,深入研究其疲劳行为和断裂失效机理具有重要意义。首先综述了镁稀土合金疲劳性能的研究进展;重点阐述了镁稀土合金疲劳裂纹萌生、扩展的微观机理;随后总结了热处理、晶粒细化、表面强化等多种提高镁稀土合金疲劳性能的方法;最后对镁稀土合金疲劳行为的研究方向进行了展望。As an engineering structural material with ultra-light weight,high specific strength and good heat resistance,rare-earth containing magnesium alloys(Mg-RE alloys)have been acknowledged as one of the most promising candidate for aircraft,aerospace and railway transportation applications.The alternating load in actual service puts forward a strict requirement on the fatigue performance of Mg-RE alloys.In order to ensure the durability and safety of load-bearing structural parts,it is of great significance to understand their fatigue behavior and fracture failure mechanism in depth.The research progress in the fatigue properties of Mg-RE alloys was expounded,focusing on the microscopic mechanism of fatigue crack initiation and propagation.After that,the heat treatment,grain refinement,surface strengthening and many other ways were described to improve the fatigue properties of Mg-RE alloys.Finally,essential futuristic works devoted to the research of fatigue behavior were prospected.

关 键 词：镁稀土合金 疲劳行为 裂纹萌生与扩展 微观组织调控 

分 类 号：TG146.22[一般工业技术—材料科学与工程]