The improvement of mechanical properties of friction-stir-welded A356 Al alloy

被引:161
作者
Lee, WB
Yeon, YM
Jung, SB
机构
[1] Sungkyunkwan Univ, Dept Adv Mat Engn, Micro Syst Packaging Lab, Suwon 440746, South Korea
[2] Suwon Sci Coll, Dept Automat Welding Engn, Suwon 440746, South Korea
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 355卷 / 1-2期
关键词
friction stir welding; A356 Al alloy; Si particles;
D O I
10.1016/S0921-5093(03)00053-4
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The joint characteristics of friction-stir-welded A356 alloys, especially concerning the improvement of mechanical properties at the weld zone, were observed with various FSW (friction stir welding) speeds. The microstructures of the weld zone are composed of SZ (stir zone), TMAZ (thermo-mechanical affected zone) and BM (base metal). The BM shows the hypoeutectic Al-Si dendrite structure. The microstructure of the SZ is very different from that of the BM. The eutectic Si particles are dispersed homogeneously in primary Al solid solution. TMAZ, where the original microstructure was greatly deformed, is characterized by dispersed eutectic Si particles aligned along the rotational direction of the welding tool. These regions are mainly formed at the advancing side and the upper region of the retreating side. The mechanical properties of the weld zone are greatly improved in comparison to that of the BM. The hardness of the weld zone shows more uniform distribution than that of the BM because some defects are remarkably reduced and the eutectic Si particles are dispersed over the SZ. The tensile strength of the SZ is also greatly elevated and shows over 178 MPa, i.e. almost 120% that of the BM. Therefore, the FSW is well applied to the joining of the cast Al alloys. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:154 / 159
页数:6
相关论文
共 15 条
[1]  
[Anonymous], P 3 INT S FRICT STIR
[2]  
DAWES CJ, 1995, TWI B, V6, P138
[3]  
JUHAS M, 2001, P 3 INT S FRICT STIR
[4]   On the formation of onion rings in friction stir welds [J].
Krishnan, KN .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 327 (02) :246-251
[5]  
Lederich RJ, 2001, FRICTION STIR WELDING AND PROCESSING, P71
[6]   Microstructural aspects of the friction-stir welding of 6061-T6 aluminum [J].
Liu, G ;
Murr, LE ;
Niou, CS ;
McClure, JC ;
Vega, FR .
SCRIPTA MATERIALIA, 1997, 37 (03) :355-361
[7]  
LOCKYER SA, 2001, P 3 INT S FRICT STIR
[8]   Properties of friction-stir-welded 7075 T651 aluminum [J].
Mahoney, MW ;
Rhodes, CG ;
Flintoff, JG ;
Spurling, RA ;
Bingel, WH .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (07) :1955-1964
[9]   A TEM study of precipitation and related microstructures in friction-stir-welded 6061 aluminium [J].
Murr, LE ;
Liu, G ;
McClure, JC .
JOURNAL OF MATERIALS SCIENCE, 1998, 33 (05) :1243-1251
[10]   Effects of friction stir welding on microstructure of 7075 aluminum [J].
Rhodes, CG ;
Mahoney, MW ;
Bingel, WH ;
Spurling, RA ;
Bampton, CC .
SCRIPTA MATERIALIA, 1997, 36 (01) :69-75