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金属学报  2015, Vol. 51 Issue (12): 1449-1456    DOI: 10.11900/0412.1961.2015.00154
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7B04铝合金薄板的搅拌摩擦焊接及接头低温超塑性研究*
杨超1,2,王继杰2,马宗义1,倪丁瑞1(),付明杰3,李晓华3,曾元松3
1 中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳 110016
2 沈阳航空航天大学材料科学与工程学院, 沈阳 110036
3 北京航空制造工程研究所金属成形技术研究室, 北京 100024
FRICTION STIR WELDING AND LOW-TEMPERATURE SUPERPLASTICITY OF 7B04 Al SHEET
Chao YANG1,2,Jijie WANG2,Zongyi MA1,Dingrui NI1(),Mingjie FU3,Xiaohua LI3,Yuansong ZENG3
1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 College of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110036
3 Metal Forming Technology Department, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024
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摘要: 

在转速1600 r/min, 焊速200 mm/min; 转速800 r/min, 焊速200 mm/min; 转速400 r/min, 焊速400 mm/min 3组参数下对2 mm厚的退火态7B04铝合金薄板进行搅拌摩擦焊接, 研究了焊接参数对焊缝质量及微观组织的影响, 并分析了焊核区的低温超塑性变形行为. 结果表明, 通过控制焊接参数, 可获得良好的焊接质量, 接头强度系数达100%. 焊核区发生动态再结晶, 生成细小等轴晶, 母材晶粒尺寸约为300 μm, 转速为1600, 800和 400 r/min时晶粒尺寸分别为2, 1和0.6 μm. 这种细晶组织有利于焊核区超塑变形, 在300 ℃, 焊核区在1×10-3和3×10-4 s-1应变速率下获得了160%~590%的延伸率, 在350 ℃, 1×10-3 s-1条件下获得高达790%的最大延伸率, 在约400 ℃时超塑性变形行为消失.

关键词 超高强铝合金搅拌摩擦焊接超塑性微观组织    
Abstract

Annealed 7B04 Al sheets in thickness of 2 mm were subjected to friction stir welding (FSW) under three rotation rate and welding speed parameters of 1600 r/min, 200 mm/min; 800 r/min, 200 mm/min and 400 r/min, 400 mm/min, respectively. The effect of welding parameters on the tensile property and microstructure of the FSW joints were investigated, with more efforts focusing on the low-temperature superplasticity of the nugget zones (NZs). The results showed that FSW joints with high quality could be produced by controlling welding parameters, with a joint strength coefficient of 100% being obtained. Dynamic recrystallization took place in the NZs with fine and equiaxed grains generated. The grain size of the base material was about 300 μm, while it was significantly decreased in the NZs with decreasing the rotation rate: about 2, 1 and 0.6 μm for the above three samples, respectively. The fine grain structure of the NZs could facilitate their superplastic deformation. The NZs exhibited superplastic elongations ranged from 160% to 590% at 300 ℃ at strain rates of 1×10-3 and 3×10-4 s-1. The maximum superplasticity of 790% was obtained at 350 ℃ at the strain rate of 1×10-3 s-1. The ability to superplastic deformation disappeared in the NZs at 400 ℃.

Key wordsultra-high strength aluminium alloy    friction stir welding    superplasticity    microstructure
     出版日期: 2016-02-22
基金资助:* 国家自然科学基金资助项目51331008

引用本文:

杨超,王继杰,马宗义,倪丁瑞,付明杰,李晓华,曾元松. 7B04铝合金薄板的搅拌摩擦焊接及接头低温超塑性研究*[J]. 金属学报, 2015, 51(12): 1449-1456.
Chao YANG,Jijie WANG,Zongyi MA,Dingrui NI,Mingjie FU,Xiaohua LI,Yuansong ZENG. FRICTION STIR WELDING AND LOW-TEMPERATURE SUPERPLASTICITY OF 7B04 Al SHEET. Acta Metall, 2015, 51(12): 1449-1456.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2015.00154      或      http://www.ams.org.cn/CN/Y2015/V51/I12/1449

图1  搅拌摩擦焊(FSW)接头室温拉伸样品和焊核区超塑性拉伸样品尺寸
Direction Tensile strength / MPa Yield strength / MPa Elongation / %
Lengthways 210.0 90.0 16.5
Crosswise 211.0 98.0 16.3
表1  7B04铝合金母材(BM)的室温拉伸性能
Specimen Ratation rate rmin-1 Welding speed mmmin-1 Tensile strength MPa Yield strength MPa Elongation %
400-400 400 400 213.5 76.0 14.5
800-200 800 200 216.5 98.5 14.7
1600-200 1600 200 212.5 78.5 16.5
表2  7B04铝合金薄板FSW接头的室温拉伸性能
图2  不同参数下7B04铝合金薄板FSW焊缝和宏观显微组织的OM像
图3  7B04铝合金BM显微组织的OM像
图4  7B04铝合金BM和FSW焊核区显微组织的TEM像
图5  7B04铝合金BM与样品400-400 FSW焊核区的XRD谱
图6  FSW 7B04铝合金的超塑性拉伸性能
图7  7B04铝合金FSW焊核区样品超塑性拉伸断后形貌
图8  样品400-400超塑性拉伸断口附近的SEM像
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