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Modelling of work-hardening behaviour for laser welded magnesium alloy

  • X. Cao , M. Jahazi , H. Al-Kazzaz und M. Medraj
Veröffentlicht/Copyright: 1. März 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 99 Heft 2

Abstract

To investigate the reliability of the laser welding process for the magnesium alloy ZE41A-T5, eight butt joints were welded using the same processing parameters. These joints were tensile tested in the as-welded and aged conditions and the tensile data were analyzed from work-hardening characteristics. The flow curves cannot entirely be satisfactorily described by the Kocks–Mecking model; however, the model is still applicable to the high strain zone of the flow curves where work-hardening rate decreases linearly with flow stress. The reproducibility of the initial work-hardening rate and saturation stress is statistically analyzed. The initial work-hardening rates for the base castings and welded joints vary from approximately 4000 to 7000 MPa, i. e. 1/4 to 1/3 of the base material shear modulus. The as-welded joints have slightly higher initial work-hardening rates than the base castings. Artificial aging produces lower initial work-hardening rates compared with the base material. The saturation stress ranges approximately from 260 to 320 MPa, i. e. about 2 % of the shear modulus. The saturation stress for the welded joints is lower than that for the base material. Compared with the as-weld joints, aging decreases initial work-hardening rate but slightly increases saturation stress. Both initial work-hardening rate and saturation stress become more scattered after aging.

Keywords:: Nd: YAG laser welding; Magnesium alloy; Work hardening; Kocks–Mecking model; Tensile property
1 Correspondence address: Dr. Xinjin Cao, Research Officer, Aerospace Manufacturing Technology Center, Institute for Aerospace Research, National Research Council Canada, 5145 Decelles Avenue, Montreal, Quebec, Canada, H3T 2B2, Tel.: +1 514 283 9047, Fax: +1 514 283 9445. E-mail:

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Received: 2007-05-17
Accepted: 2007-05-22
Published Online: 2013-03-01
Published in Print: 2008-02-01

© 2008, Carl Hanser Verlag, Munich

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  2. Contents
  3. Editorial
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  5. Basic
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  12. On recrystallization texture formation in polycrystalline fcc alloys with low stacking fault energies
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  14. Applied
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  18. Study of hydrogen absorption of aluminum melt
  19. Modelling of work-hardening behaviour for laser welded magnesium alloy
  20. Tribological behavior of short carbon fiber or hybrid with SiCp reinforced Al alloy composites
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  22. Notifications
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https://doi.org/10.3139/146.101622
Schlagwörter für diesen Artikel
Nd: YAG laser welding; Magnesium alloy; Work hardening; Kocks–Mecking model; Tensile property

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Editorial
  4. IJMR wishes all its readers and contributors a belated Happy New Year
  5. Basic
  6. Experimental study of the phase relations in the Fe–Zn–Cr system at 600°C
  7. Thermodynamic description of the ternary Pd–Sn–Zn system
  8. The morphology of nitrided iron–chromium alloys; influence of chromium content and nitrogen supersaturation
  9. The surface tension and density of Ag–Bi–Sn alloys
  10. Density and thermal expansion of liquid binary Al–Ag and Al–Cu alloys
  11. Hardening precipitation and mechanical properties in new Mg–Mn–Y–Gd alloys
  12. On recrystallization texture formation in polycrystalline fcc alloys with low stacking fault energies
  13. A numerical study of grain size effects on the strength and elongation of Al polycrystals using strain gradient plasticity theory
  14. Applied
  15. Thermodynamic simulation of the Bayer process
  16. The anisotropy of deformation for friction stir processed Mg alloy due to the existence of onion rings
  17. A study of the Si-phase growth mechanismin thixocast (A356) alloy during hot deformation
  18. Study of hydrogen absorption of aluminum melt
  19. Modelling of work-hardening behaviour for laser welded magnesium alloy
  20. Tribological behavior of short carbon fiber or hybrid with SiCp reinforced Al alloy composites
  21. Elevated temperature compressive behavior of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf alloy with minor Ho addition
  22. Notifications
  23. News
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