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| 铝合金超声辅助搅拌摩擦焊接接头组织性能研究 |
| Microstructure and Properties of Aluminium Alloy Welding Joint by Ultrasonic-assisted Friction Stir Welding |
| Received:July 09, 2018 Revised:September 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.05.005 |
| 中文关键词: 超声辅助搅拌摩擦焊 组织 性能 |
| 英文关键词: ultrasonic-assisted friction stir welding microstructure property |
| 基金项目:国家自然科学基金（51265042）；江西省优势科技创新团队建设专项计划（20171BCB24007）；江西省青年科学家培养计划（20153BCB23038）；航空科学基金（2017ZE56010） |
| Author Name | Affiliation | | CHEN Chao | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330036, China | | YU Lang | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330036, China | | CHEN Yu-hua | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330036, China | | CHEN Wei | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330036, China | | ZHANG Ti-ming | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330036, China |
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| 中文摘要: |
| 目的 探究超声振动对铝合金搅拌摩擦焊的作用效果。方法 分别采用普通搅拌摩擦焊和超声辅助搅拌摩擦焊方法，对7075铝合金进行焊接试验，并对焊接接头的微观组织、力学性能、断口形貌进行分析。结果 普通搅拌摩擦焊焊缝中生成了隧道型缺陷，施加超声振动后，缺陷消失，形成了无缺陷的良好接头，且与普通搅拌摩擦焊相比，超声辅助搅拌摩擦焊焊缝热影响区晶粒长大程度较小，焊核晶粒细化。接头强度明显提高，达到铝合金母材强度的71.5%，接头断裂模式为韧窝和准解理的混合断裂形式。结论 超声振动促进了塑性金属的流动，能有效抑制孔洞、隧道型缺陷等的形成，同时超声振动能在提升金属塑性的同时，降低焊缝的热输入。 |
| 英文摘要: |
| The paper aims to explore effects of ultrasonic vibration on friction stir welding of aluminum alloy. Microstructure, mechanical property and fracture surface of 7075-T6 aluminum alloy were analyzed through ordinary friction stir welding and ultrasonic-assisted friction stir welding respectively. A tunnel-type defect was generated in the ordinary friction stir welding. After the ultrasonic vibration was applied, the defect disappeared and a good joint without defect was formed. Compared with the ordinary friction stir welding, the degree of growth of heat affected zone grains welded by ultrasonic-assisted friction stir welding was small, the grain size of the weld nugget was refined, the joint strength was obviously improved, and it reached 71.5% of the strength of the aluminum alloy base metal. The joint fracture mode was a mixed fracture mode of dimple and quasi-cleavage. Ultrasonic vibration promotes the flow of plastic metal, which can effectively inhibit the formation of holes, tunnel-type defects, etc. At the same time, ultrasonic vibration can increase the plasticity of the metal and reduce the heat input of the weld. |
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