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On the Microstructural and Mechanical Characterization of Hybrid Laser-Welded Al-Zn-Mg-Cu Alloys

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Abstract

Butt-welded 2-mm-thick high-strength aluminum alloys have been welded using a hybrid fiber laser and pulsed arc heat source system with the ER5356 filler. The microstructure, size of precipitates, texture, grain size and shape, change of strengthening elements, mechanical properties, and surface-based fatigue fracture characteristics of hybrid-welded joints were investigated in detail. The results indicate that the hybrid welds and the unaffected base materials have the lowest and largest hardness values, respectively, compared with the heat-affected zone. It is resonably believed that the elemental loss, coarse grains, and changed precipitates synthetically produce the low hardness and tensile strengths of hybrid welds. Meanwhile, the weaker grain boundary inside welds appears to initiate a microcrack. Besides, there exists an interaction of fatigue cracks and gas pores and microstructures.

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Acknowledgments

The authors are grateful for the financial support from the Fundamental Research Funds for the Central Universities (No.: 2682013CX030), the China Postdoctoral Science Foundation (No.: 2013M531980) and  the Open Research Fund Program of the State Key Lab. of Traction Power (No.: TPL1302).

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Authors and Affiliations

  1. State Key Lab. of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

    S. C. Wu, Y. N. Hu & J. F. Peng

  2. State Key Lab. for Advanced Metals and Materials, Beijing University of Science and Technology, Beijing, 100083, China

    X. P. Song

  3. Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, 201204, China

    Y. L. Xue

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  1. S. C. Wu
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  2. Y. N. Hu
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Correspondence to S. C. Wu.

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Wu, S.C., Hu, Y.N., Song, X.P. et al. On the Microstructural and Mechanical Characterization of Hybrid Laser-Welded Al-Zn-Mg-Cu Alloys. J. of Materi Eng and Perform 24, 1540–1550 (2015). https://doi.org/10.1007/s11665-015-1408-2

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  • DOI: https://doi.org/10.1007/s11665-015-1408-2

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