Abstract: 0.02 mm thick Cu foil was used as tracer material when 7075-T6 aluminum alloy thick plates with a thickness of 20 mm were friction stir welded using the tool with a triangle plane tapered pin. The vertical temperature distribution was measured and the distribution of tracer material in the weld seam was observed, and the plastic flow characteristic of the local material was analyzed. The results show that the peak temperature decreases gradually along the vertically downward direction of the weld seam, and the temperature difference between the top and the root is about 90 ℃. Also, the temperature on the advancing side (AS) is 15 ℃ higher than that on the retreating side (RS) for two symmetric points at the same thickness of the weld. Moreover, on the weld top the Cu foil is broken up into small particles and distributed in the nugget zone (NZ), while Cu with flake structure is presented on the weld root of the NZ on the AS. It is interesting that the NZ consists of many onion rings, and in NZ the metal shows textured structure, which might be ascribed to the change of material flow along the vertical direction of the weld seam.
毛育青,柯黎明,陈玉华,刘奋成. 铝合金厚板搅拌摩擦焊焊缝局部金属的塑性流动特征[J]. 《材料导报》期刊社, 2017, 31(24): 145-149.
MAO Yuqing, KE Liming, CHEN Yuhua, LIU Fencheng. Plastic Flow Characteristic of Local Material in the Friction Stir Weld Seam of Aluminum Alloy Thick Plates. Materials Reports, 2017, 31(24): 145-149.
1 Fuller C B, Mahoney M W, Calabrese M, et al. Evolution of microstructure and mechanical properties in naturally aged 7050 and 7075 Al friction stir welds[J]. Mat Sci Eng A, 2010,527(9):2233. 2 Mao Y Q, Ke L M, Liu F C, et al. Effect of tool pin eccentricity on microstructure and mechanical properties in friction stir welded 7075 aluminum alloy thick plate[J]. Mater Des, 2014,62(62):334. 3 Ke Liming, Xing Li, Xu Weiping. Microstructure and properties of welding joints for cast magnesium alloy AZ81A[J]. J Mater Eng, 2005(1):41(in Chinese). 柯黎明, 邢丽, 徐卫平. AZ81A镁合金焊接接头的组织与性能[J]. 材料工程, 2005,(1):41. 4 Xing Li, Ke Liming, Liu Geping, et al. Microstructure and mechanical properties of a friction stir welded LD10 Aluminum[J]. Trans China Weld Inst, 2002,23(6):55(in Chinese). 邢丽, 柯黎明, 刘鸽平, 等. 铝合金LD10的搅拌摩擦焊组织及性能分析[J]. 焊接学报, 2002,23(6):55. 5 Sharma C, Dwivedi D K, Kumar P. Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy[J]. Mater Des, 2012,36:379. 6 Palanivel R, Koshy Mathews P, Murugan N, et al. Effect of tool rotational speed and pin profile on microstructure and tensile strength of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys[J]. Mater Des, 2012,40:7. 7 Wang Xiaodong, Ke Liming, Xing Li, et al. Effects of thread number of stirring pin and pluge depth on transfer of metal in weld thickness direction[J]. Chin J Nonferrous Met, 2012,20(1):100(in Chinese). 王晓东, 柯黎明, 邢丽, 等. 搅拌针表面螺纹头数与轴肩下压量对金属轴向迁移的影响[J]. 中国有色金属学报, 2012,20(1):100. 8 Ghetiya N D, Patel K M, Patel Anup B. Prediction of temperature at weld line in air and immersed friction stir welding and its experimental validation[J]. Int J Adv Manuf Tech, 2015,79(5):1239. 9 Xu W F, Liu J H, Luan G H, et al. Temperature evolution, microstructure and mechanical properties of friction stir welded thick 2219-O aluminum alloy joints[J]. Mater Des, 2009,30(6):1886. 10Canaday Clinton T, Moore Matthew A, Tang W, et al. Through thickness property variations in a thick plate AA7050 friction stir welded joint[J]. Mat Sci Eng A, 2013,559(3):678. 11Ke Liming, Pan Jiluan, Xing Li, et al. Influence of pin shape on weld transverse morphology in friction stir welding[J]. Trans China Weld Inst, 2007,28(5):16(in Chinese). 柯黎明, 潘际銮, 邢丽, 等. 搅拌针形状对搅拌摩擦焊焊缝截面形貌的影响[J]. 焊接学报, 2007,28(5):16. 12Khodaverdizadeh H, Heidarzadeh A, Saeid T. Effect of tool pin profile on microstructure and mechanical properties of friction stir welded pure copper joints[J]. Mater Des, 2013,45(7):265. 13Wu Hongyan. The influence of material property on the welding plastic metal flow of friction stir welding[D]. Nanchang: Nanchang Hangkong University, 2011:22(in Chinese). 吴鸿燕. 材料性能对铝合金搅拌摩擦焊焊缝塑性金属流动行为的影响[D]. 南昌: 南昌航空大学, 2011:22. 14Trueba Jr L, Heredia G, Rybicki D, et al. Effect of tool shoulder features on defects and tensile properties of friction stir welded aluminum 6061-T6[J]. J Mater Process Tech, 2015,219:271. 15Schneider J A, Nunes A C. Characterization of plastic flow and resulting microtextures in a friction stir weld[J]. Metall Mater Trans B, 2004,35(4):777. 16Ke Liming, Pan Jiluan, Xing Li, et al. Sucking-extruding theory for the material flow in friction stir welds[J]. J Mech Eng, 2009,45(4):89(in Chinese). 柯黎明, 潘际銮, 邢丽, 等. 搅拌摩擦焊焊缝金属塑性流动的抽吸-挤压理论[J]. 机械工程学报, 2009,45(4):89. 17Ke Liming, Xing Li, Indacochea J E. The materials flow pattern and model in the friction stir welding of aluminum alloy[C]∥Materials Solutions 2001.Indianapolis,USA,2001.
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2017, Vol. 31 
