东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (1): 112-117.DOI: 10.12068/j.issn.1005-3026.2018.01.023

• 机械工程 • 上一篇    下一篇

铝合金搅拌摩擦裂纹修复区的显微组织及力学性能

任俊刚1, 2， 谢里阳1, 2， 王磊3， 张占昌4   

  1. (1. 东北大学 机械工程与自动化学院， 辽宁 沈阳110819; 2. 东北大学 航空动力装备振动及控制教育部重点实验室， 辽宁 沈阳110819； 3. 沈阳航空航天大学 机电工程学院， 辽宁 沈阳110136; 4. 沈阳飞机工业(集团)有限公司45厂， 辽宁 沈阳110850)
  • 收稿日期:2016-07-21 修回日期:2016-07-21 出版日期:2018-01-15 发布日期:2018-01-31
  • 通讯作者: 任俊刚
  • 作者简介:任俊刚(1982-)， 男， 安徽淮南人， 东北大学博士研究生； 谢里阳(1962-)，男，安徽岳西人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51335003)； 国家自然科学基金青年基金资助项目(51405309).

Microstructure and Mechanical Properties of Crack Repairing Zone of Aluminum Alloy Through Friction Stir

REN Jun-gang1,2， XIE Li-yang1,2， WANG Lei3， ZHANG Zhan-chang4   

  1. 1. School of Mechanical Engineering & Automation， Northeastern University， Shenyang 110819， China; 2. Key Laboratory of Vibration and Control of Aero-Propulsion System， Ministry of Education， Northeastern University， Shenyang 110819，China; 3. Department of Electromechanical Engineering， Shenyang Aerospace University， Shenyang 110136， China; 4. Workshop 45， Shenyang Aircraft Corporation， Shenyang 110850， China.
  • Received:2016-07-21 Revised:2016-07-21 Online:2018-01-15 Published:2018-01-31
  • Contact: REN Jun-gang
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摘要： 对表面预制了0.8mm深、0.5mm宽裂纹的2A12铝合金进行搅拌摩擦修复，修复后对其修复区显微组织变化规律和力学性能进行了详细研究.结果表明:在合理修复工艺下，实现了裂纹的修复，修复区的平均抗拉强度R○m、屈服强度ReL可达到母材的90.1%和92.2%.修复区存在3个组织变化区，其中修复核心区的晶粒被反复碎化、长大及动态再结晶；热机影响区晶粒具有明显的塑性变形，与晶粒显著长大的热影响区共同构成组织软化区；表面硬度与截面上部硬度曲线相似，截面硬度上部依次高于下部；修复核心区存在大量的小角晶粒，并且内部存在一定密度的位错，在晶粒四周均匀分布细小强化相.

关键词: 搅拌摩擦, 2A12铝合金, 裂纹修复, 微观组织, 力学性能

Abstract: Aviation aluminum alloy 2A12 containing the prefabricated 0.8mm deep and 0.5mm horizontal cracks was repaired by the friction stir method， and the microstructure evolution and mechanical properties of the healing zone were observed and analyzed in details. The results showed that the crack repairing is realized in the reasonable healing process， and the tensile strength Rm and the yield strength ReL can reach 90.1% and 92.2% of the base metal. The healing zone consists of three different evolution zones， and in the core zone the cracks are repaired by grain fragmentation， growth and recrystallization. The structural softened zone consists of the thermo-mechanically affected zone with obvious plastic deformation and the heat affected zone with obvious grain growth. The surface hardness is similar to that of the upper cross section with the upper section being harder than that of the lower section. The healing core zone consists of many small angle crystals with dislocated lines inside and tiny strengthening phases around.

Key words: friction stir, aluminum alloy 2A12, crack repairing, microstructure, mechanical property

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