Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis

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	Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis
	Wu, S. C.; Yu, X.; Zuo, R. Z.; Zhang, W. H.; Xie, H. L.; Jiang, J. Z.
	2013
Source Publication	WELDING JOURNAL
ISSN	0043-2296
Volume	92 Issue:3 Pages:64s-71s
Abstract	The severe strength loss of hybrid welded Al-Zn-Mg-Cu alloy joints such as 7075-T6 has been characterized using high-resolution synchrotron radiation X-rays and theoretical modeling. To elucidate the physical causes of this static strength change, the distribution of strengthening elements such as Zn and Cu and the three-dimensional gas porosity were mapped. The interesting findings included the following: 1) Hybrid welds only reach approximately 53% of the ultimate tensile strength of the base phase, and the lowest strength is situated in the central fusion zone; 2) because of the excessive evaporation of elemental Zn and the significant inverse segregation of elemental Cu in cenral fusion welds, the major strengthening elements gather near the heat-affected zone; 3) the elastic modulus of hybrid welds is slightly larger than that of their base alloys, probably as a result of the inhomogeneity in their chemical composition, microstructure, geometry, and residual stress; 4) the pore size ranges from below 0.01 mu m to approximately 107 mu m, and it is modeled by the Schwartz-Saltykov method to reveal its damaging effects on the static strength; 5) a strength model of 7075-T6 welded butt joints is established to correlate with the elastic modulus, porosity, and heat inputs, and it coincides well with the computational and experimental results; and 6) in principle, the porosity has little influence on the static strength of hybrid welds, and the modified strengthening structure markedly dominates the overall mechanical properties.
Indexed By	SCI
Language	英语
Funding Project	应物所项目组
Document Type	期刊论文
Identifier	http://ir.sinap.ac.cn/handle/331007/13857
Collection	中科院上海应用物理研究所2011-2019年
Recommended Citation GB/T 7714	Wu, S. C.,Yu, X.,Zuo, R. Z.,et al. Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis[J]. WELDING JOURNAL,2013,92(3):64s-71s.
APA	Wu, S. C.,Yu, X.,Zuo, R. Z.,Zhang, W. H.,Xie, H. L.,&Jiang, J. Z..(2013).Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis.WELDING JOURNAL,92(3),64s-71s.
MLA	Wu, S. C.,et al."Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis".WELDING JOURNAL 92.3(2013):64s-71s.

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