金属学报  2012, Vol. 48 Issue (9): 1109-1115    DOI: 10.3724/SP.J.1037.2012.00163

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焊接参数对AlCuLi合金搅拌摩擦焊接头微观结构和力学性能的影响

王东1), 董春林2), 肖伯律1), 高崇2), 何淼2), 栾国红2), 马宗义1)

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) 中航工业北京航空制造工程研究所, 北京 100024

EFFECT OF WELDING PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED AlCuLi ALLOY JOINTS

WANG Dong1),  DONG Chunlin2), XIAO Bolv1), GAO Cong2),  HE Miao2),  LUAN Guohong2),  MA Zongyi1)

1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 2) AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024

王东 董春林 肖伯律 高崇 何淼 栾国红 马宗义. 焊接参数对AlCuLi合金搅拌摩擦焊接头微观结构和力学性能的影响[J]. 金属学报, 2012, 48(9): 1109-1115.
, , , , , . EFFECT OF WELDING PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED AlCuLi ALLOY JOINTS[J]. Acta Metall Sin, 2012, 48(9): 1109-1115.

摘要 参考文献 相关文章 Metrics 全文: PDF(4841 KB)   摘要: 在不同的搅拌头转速及焊接速度下, 对2 mm厚AlCuLi合金进行了搅拌摩擦焊接. 结果表明, 焊核区由细小等轴再结晶晶粒组成. 随搅拌头转速增加, 晶粒尺寸逐渐增加; 随焊接速度增加, 晶粒尺寸略有减小. TEM分析表明, 焊核区的析出相大部分溶解, 在随后的冷却过程中形成粗大的析出相, 而在热影响区析出大量的粗大平衡相. 在较低的焊接速度(80 mm/min)下, 接头在热影响区的硬度最低点发生断裂, 随搅拌头转速增加, 接头强度逐渐升高, 最高可达母材的87%, 延伸率约为10%. 而在较高的焊接速度(200 mm/min)下, 搅拌头转速较低时, 焊核区材料流动不充分, 样品在焊核处发生断裂, 强度较低, SEM分析表明, 断口出现材料流动不充分导致的缺陷; 随搅拌头转速增加, 断口处缺陷明显减少, 对强度影响不显著, 接头强度可达母材的84%. 关键词 ： 搅拌摩擦焊,  Al-Li合金,  力学性能,  显微组织,  再结晶     Abstract：Friction stir welding (FSW) of a novel AlCuLi alloy was conducted to investigate the effect of welding parameters on the microstructure and mechanical properties of the joints. The fine and equiaxed dynamically rotation rate increased, the size of the grains in the NZ increased. However, with increasing the welding speed, the size of the grains in the NZ decreased slightly. TEM analyses indicated that most of the precipitates in the NZ dissolved into the matrix during FSW and some coarse precipitates formed during subsequent cooling process. Moreover, many coarse precipitates were observed in the heat affected zone (HAZ) due to the FSW thermal cycle. At a low welding speed of 80 mm/min, the ultimate tensile strength of the joints increased as the rotation rate increased, and could reach up to 442 MPa which was 87% of that of the base metal. All of the joints failed in the lowest hardness zone of the HAZ. At a high welding speed of 200 mm/min, some defects resulting from insufficient material flow were observed on the fracture surfaces. At a low rotation rate, the joints failed along the defects in the NZ and exhibited a low strength. As the rotation rate increased, the size and number of the defects decreased. Therefore, the effect of the defects on the strength of the joints was significantly reduced, and a joint efficiency of 84% was obtained. Key words： friction stir welding    Al-Li alloy    mechanical property    microstructure    recrystallization 收稿日期: 2012-03-31      ZTFLH:  TG 146. 2   基金资助: 总装预研基金资助项目9140A18050109HK55 作者简介: 王东, 男, 1980年生, 助理研究员, 硕士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王东 董春林 肖伯律 何淼 栾国红 马宗义 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00163      或      https://www.ams.org.cn/CN/Y2012/V48/I9/1109 [1] Wang Z T, Tian R Z. Handbook of Aluminum Alloy and Processing. 3rd Ed., Changsha: Central South University Press, 2005: 317 (王祝堂, 田荣璋, 铝合金及其加工手册. 第3版, 长沙: 中南大学出版社, 2005: 317) [2] Wang S C, Starink M J. Int Mater Rev, 2005; 50: 193 [3] Kostrivas A, Lippold J C. Int Mater Rev, 1999; 44: 217 [4] Mishra R S, Ma Z Y. Mater Sci Eng, 2005; R50: 1 [5] Wang D, Liu J, Xiao B L, Ma Z Y. Acta Metall Sin, 2010; 46: 589 (王东, 刘杰, 肖伯律, 马宗义. 金属学报, 2010; 46: 589) [6] Xie G M, Ma Z Y, Geng L. 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