Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第1期    总第58期    2004年1月

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文章编号:1004-0609(2004)01-0069-05
Al-Cu-Li合金搅拌摩擦焊接头的微观组织和力学性能
王大勇, 冯吉才, 刘会杰, 狄 欧

(哈尔滨工业大学 现代焊接生产技术国家重点实验室,
哈尔滨 150001
)

摘 要: 采用搅拌摩擦焊方法对2mm厚的Al-Cu-Li合金轧制板进行了焊接。 接头内形成了焊核区、 热机影响区和热影响区。 焊核区由细等轴再结晶组织构成; 热机影响区内的组织发生较大的弯曲变形, 并在热循环的作用下发生了回复反应; 热影响区形成了粗大的板条状组织。 实验结果表明: 在200mm/min的焊接速度下, 接头的拉伸强度最高, 达到393MPa, 断裂形式为韧性和脆性的混合型断裂; 在500mm/min的焊接速度下, 接头强度为267.7MPa, 断裂形式为脆性断裂。

 

关键字: 搅拌摩擦焊; Al-Cu-Li合金; 接头组织; 力学性能

Microstructures and mechanical properties of friction-stir welding joint of Al-Cu-Li alloy
WANG Da-yong, FENG Ji-cai, LIU Hui-jie, DI Ou

State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China

Abstract: Friction-stir welds of Al-Cu-Li aluminum rolled sheet material in 2mm thickness were completed and the joint microstructures could be divided into there regions, namely, welded nugget zone(WNZ), thermal-mechanically affected zone(TMAZ) and heat affected zone(HAZ). And there are much difference for microstructures among the above three zones: the microstructures within the WNZ, in which dynamic recrystallization occurred, consist of refined, equiaxed grains; those within the TMAZ, in which recovery occurred, consist of highly deformed grains; those within the HAZ consist of coarse lath grains. Mechanical property measurement and fracture analysis demonstrate that the peak tensile strength of the joint is 393MPa at 200mm/min and the fracture mode is ductile/brittle mixed fracture; and at 500mm/min, tensile strength of the joint is 267.7MPa, and the fracture mode is brittle fracture.

 

Key words: friction-stir welding; Al-Cu-Li alloy; joint microstructures; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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