李劲风,陈永来,张绪虎,郑子樵.2195-T8铝锂合金板材摩擦搅拌焊接头组织与力学性能[J].稀有金属材料与工程,2018,47(3):780~787.[Li Jin-feng,Chen Yong-lai,Zhang Xu-hu,Zheng Zi-qiao.Mechanical Property and Structures of Friction-Stir Weld Joint of 2195-T8 Al-Li Alloy Plate[J].Rare Metal Materials and Engineering,2018,47(3):780~787.]
2195-T8铝锂合金板材摩擦搅拌焊接头组织与力学性能
投稿时间:2016-03-31  修订日期:2016-06-17
中文关键词:  2195 铝锂合金  摩擦搅拌焊  力学性能  组织
基金项目:国家高技术研究发展计划(863计划)
中文摘要:
      采用圆柱状搅拌针及带螺纹圆柱状搅拌针,进行了5 mm厚度2195-T8铝锂合金板材的摩擦搅拌焊接,研究了旋转速度及焊接速度对接头拉伸性能的影响,并检测了接头组织。采用圆柱状搅拌针(旋转速度1000 r/min)进行焊接,当焊接速度不当时,产生贯穿焊缝的连续孔洞,导致接头强度较低。采用带螺纹圆柱状搅拌针进行焊接(焊接速度120 mm/min)时,可消除上述孔洞缺陷,且随旋转速度由700 r/min增加至1100 r/min,接头强度增加。焊核区晶粒发生再结晶,但晶粒尺寸分布不均匀;从焊核区顶部至底部,晶粒尺寸降低;紧邻热机影响区的焊核区晶粒尺寸小于中心焊核区。焊核区T1 (Al2CuLi)相和q¢ (Al2Cu)相完全溶解,而热机影响区所有q¢相及大部分T1相溶解。另外,在焊核心区形成较多位错。
Mechanical Property and Structures of Friction-Stir Weld Joint of 2195-T8 Al-Li Alloy Plate
英文关键词:2195 Al-Li alloy  friction stir weld (FSW)  mechanical Properties  structures
英文摘要:
      The tensile properties of friction stir weld (FSW) joint of 2195-T8 Al-Li alloy plate with 5 mm thickness prepared by straight cylindrical pin and threaded cylindrical pin at different rotational speed and welding speed were investigated. The structures of the FSW joint were detected. As prepared by straight cylindrical pin at improper welding speed, continuous hole was formed in the FSW joint along the welding direction, leading to lower joint strength. Threaded cylindrical pin alleviated the formation of hole in the weld, and the joint strength was increased with the rotational speed increasing from 700 r/min to 1100 r/min. The grains in the nugget zone (NZ) were recrystallized, and their size was decreased along the direction from the top to the bottom. Meanwhile, the grain size in the NZ adjacent to the thermo-mechanically affect zone (TMAZ) was smaller than that in the central NZ. The precipitates of T1 (Al2CuLi) and q¢ (Al2Cu) in the NZ were completely dissolved. All q¢ precipitates but most T1 precipitates were dissolved in the TMAZ. Meanwhile, dislocations were formed in the NZ.
作者单位E-mail
李劲风 中南大学材料科学与工程学院 lijinfeng@csu.edu.cn 
陈永来 航天材料及工艺研究所  
张绪虎 航天材料及工艺研究所  
郑子樵 中南大学材料科学与工程学院  
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