Microstructure and Property of Friction Stir Welding Joint of 7075Al and AZ31BMg

doi:10.1007/s12204-012-1345-2

摘要/Abstract

摘要： Microstructure and forming quality of friction stir welding joints of 7075Al and AZ31BMg with different welding parameters were analyzed. The results show that, good welded joint is obtained when the rotating frequency is 13 r/s and the welding speed is 30 mm/min. An irregular area is formed in the welding center. Meanwhile, the river pattern and eddy-like distribution are found in the weld nugget zone. Besides, brittle intermetallic compounds Al12Mg17 and Al3Mg2 are found in the welded joint. They cause the increase of microhardness of welded joint. The maximum tension stress of welded joint is 112MPa.

关键词: friction stir welding, aluminum alloy, magnesium alloy, microstructure, tension stress

Abstract: Microstructure and forming quality of friction stir welding joints of 7075Al and AZ31BMg with different welding parameters were analyzed. The results show that, good welded joint is obtained when the rotating frequency is 13 r/s and the welding speed is 30 mm/min. An irregular area is formed in the welding center. Meanwhile, the river pattern and eddy-like distribution are found in the weld nugget zone. Besides, brittle intermetallic compounds Al12Mg17 and Al3Mg2 are found in the welded joint. They cause the increase of microhardness of welded joint. The maximum tension stress of welded joint is 112MPa.

Key words: friction stir welding, aluminum alloy, magnesium alloy, microstructure, tension stress

中图分类号:

TG 453

LI Da1,2 (李达), CUI Zhan-quan2 (崔占全), YANG Qing-xiang2* (杨庆祥),SUN Bing1 (孙兵), SUN. Microstructure and Property of Friction Stir Welding Joint of 7075Al and AZ31BMg[J]. 上海交通大学学报（英文版）, 2012, 17(6): 679-683.

LI Da1,2 (李达), CUI Zhan-quan2 (崔占全), YANG Qing-xiang2* (杨庆祥),SUN Bing1 (孙兵), SUN Ming-hui2 (孙明辉). Microstructure and Property of Friction Stir Welding Joint of 7075Al and AZ31BMg[J]. Journal of shanghai Jiaotong University (Science), 2012, 17(6): 679-683.

参考文献

[1] Su J Q, Nelson T W, Mishra R, et al. Microstructure investigation of friction stir welded 7050-T651 aluminum [J]. Acta Materialia, 2003, 51(3): 713-729.
[2] Sharma C, Dwivedi D K, Kumar D. Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy [J]. Materials and Design, 2012, 36:379-390.
[3] Khodaverdizadeh H, Mahmoudi A, Heidarzadeh A, et al. Effect of friction stir welding (FSW) parameters on strain hardening behavior of pure copper joints [J]. Materials and Design, 2012, 35: 330-334.
[4] Palanivel R, Mathews D K, Murugan N, et al. Effect of tool rotational speed and pin profile on microstructure and tensile strength of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys [J]. Materials and Design, 2012, 40: 7-16.
[5] Jamshidi Aval H, Serajzadeh S, Kokabi A H. Thermo-mechanical and microsturcture issues in dissimilar friction stir welding of AA5086-AA6061 [J]. Journal of Materials Science, 2011, 46(10): 3258-3268.
[6] Jamshidi Aval H, Serajzadeh S, Kokabi A H. Evolution of microstructures and mechanical properties in similar and dissimilar friction stir welding of AA5086 and AA6061 [J]. Materials Science and Engineering A, 2011, 528: 8071-8083.
[7] Liu D, Nishio H, Nakata K. Anisotropic property of material arrangement in friction stir welding of dissimilar Mg alloys [J]. Materials and Design, 2011, 32:4818-4824.
[8] Park S K, Hong S T, Park J H, et al. Effect of material locations on properties of friction stir welding joints of dissimilar aluminum alloys [J]. Science and Technology of Welding and Joining, 2010, 15: 331-336.
[9] Malarvizhi S, Balasubramanian V. Influences of tool shoulder diameter to plate thickness ratio (D/T) on stir zone formation and tensile properties of friction stir welded dissimilar joints of AA6061 aluminum-AZ31B magnesium alloys [J]. Materials and Design, 2012, 40: 453-460.
[10] Cao X, Jahazi M. Effect of welding speed on the quality of friction stir welded butt joints of a magnesium alloy [J]. Materials and Design, 2009, 30: 2033-2042.
[11] Kostka A, Coelho R S, Santos J D, et al. Microstructure of friction stir welding of aluminium alloy to magnesium alloy [J]. Scripta Materialia, 2009, 60:953-956.
[12] Somasekharan A C, Murr L E. Microstructure in friction-stir welded dissimilar magnesium alloys and magnesium alloys to 6061-T6 aluminum alloy [J]. Materials Characterization, 2004, 52: 49-64.
[13] Yan J C, Xu Z W, Li Z Y, et al. Microstructure characteristics and performance of dissimilar welds between magnesium alloy and aluminum formed by friction stirring [J]. Scripta Materialia, 2005, 53: 585-589.
[14] Kwon Y J, Shigematsu I, Saito N. Dissimilar friction stir welding between magnesium and aluminum alloys [J]. Materials Letters, 2008; 62: 3827-3829.
[15] Chang W S, Rajesh S R, Chun C K, et al. Microstructure and mechanical properties of hybrid laserfriction stir welding between AA6061-T6 Al alloy and AZ31 Mg alloy [J]. Journal of Materials Science and Technology, 2011, 27(3): 199-204.
[16] Mofid M A, Abdollah-Zadeh A, Malek Ghaini F. The effect of water cooling during dissimilar friction stir welding of Al alloy to Mg alloy [J]. Materials and Design, 2012, 36: 161-167.
[17] Li Da, Sun Ming-hui, Cui Zhan-quan. Effect of parameters on friction stir welding joint of 7075Al and AZ31Mg [J]. Transactions of the China Welding Institution,2011, 32(8): 97-100 (in Chinese).
[18] Liu H J, Zhang H J, Yu L. Effect of welding speed on microstructures and mechanical properties of underwater friction stir welded 2219 aluminum alloy [J].Materials and Design, 2011, 32: 1548-1553.
[19] Sarkari Khorrami M, Kazeminezhad M, Kokabi A H. Microstructure evolutions after friction stir welding of severely deformed aluminum sheets [J]. Materials and Design, 2012, 40: 364-372.
[20] Hao Shi-ming. Alloying of magnesium alloys and phase diagram [J]. Journal of Materials and Metallurgy, 2002, 1(3): 166-170 (in Chinese).