LD31LF6铝合金搅拌摩擦焊接头组织与性能.pdfVIP

LD31- LF6 15 1 1 1 1 2 LD31- LF6 ( 1., 330063; 2. ! , 471003) [] ; ;; [ ] LF6/LD31, , , , , LF6 LD31, , , , 316MPa, , LD31 [] TG457. 14 [] A [] 1001- 4926( 2008) 01- 0015- 05 The organization and performance ofLD31- LF6 alum inium alloy friction stir welding 1 1 1 1 2 LI Ge- ping, H ANG Chun- ping, X ING Li, KE Li- m ing, CHEN Chang- qing ( 1. N anchang Hangkong University, N anchang 330063China; 2. Luoyang CAMA RealE state Packing Co. , L t . , Luoyang 471003China) K ey words: friction stirwelding; dissmi ilar metal joining; m icrostructure; property Abstract: Dissmi ilar materials, LD31 and LF6 alum inium alloy were joined by friction stirwelding, and the effects of the position for the pin to be inserted on theweld appearance, m icrostructure and mechanicalproperties of jointwere analyzed. The results show that a defect- free jointw ith goodweld surface appearance can be obtained with suitablewelding conditions for lock joint of the dissmi ilar materials. Opticalm icroscopy reveals the stir zone presents particularly fine equiaxed grains, resulting in dynamic recrystallization. In the stir zone, them icrostructure presents lamella alternately on the lower part. The maxmi um tensile strength of the jointwas about 100% of that of the LF6 alum inium alloy basemetal. The tensile failure happened at the boundary between the nugget and thermome chanically affected zone of the LD31 alum inium alloy, indicating that theweld has a higher joining strength. ( friction stirwelding, FSW ) , , , ,, , [] 2007- 11- 18 [] 2007- 12- 17 [](0450090), ( BC200201014) []( 1954- ), , , 2008 3