Acta Metall Sin  2012, Vol. 48 Issue (9): 1109-1115    DOI: 10.3724/SP.J.1037.2012.00163

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EFFECT OF WELDING PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED AlCuLi ALLOY JOINTS

WANG Dong1),  DONG Chunlin2), XIAO Bolv1), GAO Cong2),  HE Miao2),  LUAN Guohong2),  MA Zongyi1)

1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 2) AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024

WANG Dong DONG Chunlin XIAO Bolv GAO Cong HE Miao LUAN Guohong MA Zongyi. EFFECT OF WELDING PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED AlCuLi ALLOY JOINTS. Acta Metall Sin, 2012, 48(9): 1109-1115.

Abstract References Related Articles Recommended Metrics Download:  PDF(4841KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Friction stir welding (FSW) of a novel AlCuLi alloy was conducted to investigate the effect of welding parameters on the microstructure and mechanical properties of the joints. The fine and equiaxed dynamically rotation rate increased, the size of the grains in the NZ increased. However, with increasing the welding speed, the size of the grains in the NZ decreased slightly. TEM analyses indicated that most of the precipitates in the NZ dissolved into the matrix during FSW and some coarse precipitates formed during subsequent cooling process. Moreover, many coarse precipitates were observed in the heat affected zone (HAZ) due to the FSW thermal cycle. At a low welding speed of 80 mm/min, the ultimate tensile strength of the joints increased as the rotation rate increased, and could reach up to 442 MPa which was 87% of that of the base metal. All of the joints failed in the lowest hardness zone of the HAZ. At a high welding speed of 200 mm/min, some defects resulting from insufficient material flow were observed on the fracture surfaces. At a low rotation rate, the joints failed along the defects in the NZ and exhibited a low strength. As the rotation rate increased, the size and number of the defects decreased. Therefore, the effect of the defects on the strength of the joints was significantly reduced, and a joint efficiency of 84% was obtained. Key words:  friction stir welding      Al-Li alloy      mechanical property      microstructure      recrystallization      Received:  31 March 2012      ZTFLH:  TG 146. 2   Fund:  Supported by GAD Pre-research Foundation of China (No.9140A18050109HK55) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors YU Dong DONG Chun-Lin XIAO Ba-Lv HE Miao LUAN Guo-Hong MA Zong-Xi URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00163     OR     https://www.ams.org.cn/EN/Y2012/V48/I9/1109 [1] Wang Z T, Tian R Z. Handbook of Aluminum Alloy and Processing. 3rd Ed., Changsha: Central South University Press, 2005: 317 (王祝堂, 田荣璋, 铝合金及其加工手册. 第3版, 长沙: 中南大学出版社, 2005: 317) [2] Wang S C, Starink M J. Int Mater Rev, 2005; 50: 193 [3] Kostrivas A, Lippold J C. Int Mater Rev, 1999; 44: 217 [4] Mishra R S, Ma Z Y. Mater Sci Eng, 2005; R50: 1 [5] Wang D, Liu J, Xiao B L, Ma Z Y. 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