Microstructure and Cryogenic Mechanical Properties of AA5083 Joints Prepared by Friction Stir Welding

Abstract:

In this study, 5083 aluminum alloy plates with a thickness of 3mm are friction stir welded and the microstructure and mechanical properties of the joints were characterized. In particular, tensile behavior of the joints is examined at 77K. It is found that defect-free joints can be obtained under a tool rotational rate of 800rpm and a welding speed of 60mm/min. The friction stirring welds exhibit finer microstructure and higher hardness than that of the base material due to the grain refinement. The ultimate tensile strength (UTS) and elongation of the joints measured at 298K are 316MPa and 21.3%, which are nearly equal to those of the base material. With the tensile test temperature decreasing to 77K, UTS and elongation of both the base material and joints increase. Comparing with tensile testing at 298K, dimples on the fracture surface of the samples tested at 77K are more uniform in distribution. The improvement of the mechanical properties of specimens at low temperature is related to the inactivation of planar slip and the strengthening of strain hardening.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 243-248
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.243
• Online since: April 2014
• Authors: Bao Kang Gu*, Da Tong Zhang
• Keywords: AA5083 Aluminum Alloy, Cryogenic Mechanical Properties, Friction Stir Welding (FSW), Microstructure

References

[1] Huang K, Lui T, Chen L. Effect of microstructural feature on the tensile properties and vibration fracture resistance of friction stirred 5083 Alloy[J], Journal of Alloys and Compounds. 2011, 509(27): 7466-7472.

DOI: 10.1016/j.jallcom.2011.04.080

[2] Zhang M Y, Wang X M, Zhang M A, et al. Fracture analysis of 5083 aluminum alloy used in high-speed wind shield installing seat[J], Electric Welding Machine. 2013, 43(4)67-71.

[3] LI S X, Chen J, Wang Q, et al. TIG Welding Procedure Test of Aluminum Magnesium Alloy 5083[J], Petro-Chemical Equipment. 2013, 42(1)5-8.

[4] Zhang H C, Hua J. I. Gou G Q, et al. Research on thermal cycle and residual stress of A5083P-O aluminum alloy MIG welding on high speed train[J], Electric Welding Machine. 2011, 41(11)30-34.

[5] Bisadi H, Tavakoli A, Tour Sangsaraki M, et al. The influences of rotational and welding speeds on microstructures and mechanical properties of friction stir welded Al5083 and commercially pure copper sheets lap joints[J], Materials and Design, 2013, 43: 80-88.

DOI: 10.1016/j.matdes.2012.06.029

[6] Mishra R S, Ma Z Y. Friction stir welding and processing[J]. Materials Science and Engineering: R: Reports. 2005, 50(1–2): 1-78.

DOI: 10.1016/j.mser.2005.07.001

[7] Choi D, Ahn B, Quesnel D J, et al. Behavior of β phase (Al3Mg2) in AA 5083 during friction stir welding[J], Intermetallics, 2013, 35: 120-127.

DOI: 10.1016/j.intermet.2012.12.004

[8] Yazdipour A R, Shafieim A, Aval H J, An investigation of the microstructures and properties of metal inert gas and friction stir welds in aluminum alloy 5083[J], Sadhana - Academy Proceedings in Engineering Sciences. 2011, 36(4): 505-514.

DOI: 10.1007/s12046-011-0032-6

[9] Han M, Lee S, Park J, et al. Optimum condition by mechanical characteristic evaluation in friction stir welding for 5083-O Al alloy[J]. Transactions of Nonferrous Metals Society of China (English Edition). 2009, 19(SUPPL. 1): s17-s22.

DOI: 10.1016/s1003-6326(10)60238-5

[10] Chen Z W, Pasang T, Qi Y. Shear flow and formation of Nugget zone during friction stir welding of aluminium alloy 5083-O[J]. Materials Science and Engineering A. 2008, 474(1-2): 312-316.

DOI: 10.1016/j.msea.2007.05.074

[11] Rao D, Huber K, Heerens J, et al. Asymmetric mechanical properties and tensile behaviour prediction of aluminium alloy 5083 friction stir welding joints[J]. Materials Science and Engineering A. 2013, 565: 44-50.

DOI: 10.1016/j.msea.2012.12.014

[12] Liu Y, Zhang X, Li H, et al. Tensile properties of 2519 aluminum alloy at low temperature[J], Journal of Central South University (Science and Technology), 2006, 37(4): 641-645.

[13] Liu Y, Zhang X, Li H, et al. Tensile properties of three kinds of aluminum alloys at low temperature[J]. Heat Treatment of Metals, 2007, 32(1): 53-56.