Microstructure analysis of magnesium alloy melted by laser irradiation

Liu, S.Y.; Hu, Jiejun; Yang, Yanan; Guo, Zuoxing; Wang, H.Y.

doi:10.1016/j.apsusc.2005.03.110

Cited by 50 publications

(27 citation statements)

References 14 publications

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“…11, predicted quenching rate on the melting zone exceeded 10 4 • C/s. This result is in accordance with those of Liu et al (2005).…”

Section: Resultssupporting

confidence: 82%

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Finite element simulation of magnesium alloys laser beam welding

Belhadj¹,

Bessrour²,

Masse³

et al. 2010

Journal of Materials Processing Technology

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tIn this paper, a three-dimensional finite element model is developed to simulate thermal history magnesium-based alloys during laser beam welding. Space-time temperature distributions in weldments are predicted from the beginning of welding to the final cooling. The finite element calculations were performed using Cast3M code with which the heat equation is solved considering a non-linear transient behaviour. The applied loading is a moving heat source that depends on process parameters such as power density, laser beam dimensions and welding speed, and it is associated to moving boundary conditions. Experiments were carried out to determine temperature evolution during welding and to measure the laser weld width. By comparing the thermal model answers with the measurements, it is found that numerical simulations results are in a good agreement with the experimental data.

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“…11, predicted quenching rate on the melting zone exceeded 10 4 • C/s. This result is in accordance with those of Liu et al (2005).…”

Section: Resultssupporting

confidence: 82%

“…The molten zone was characterized by a dendritic microstructure. Liu et al (2005) had observed this structure with high solidification rate of as-cast magnesium alloys melded by laser radiation.…”

Section: Resultsmentioning

confidence: 99%

Finite element simulation of magnesium alloys laser beam welding

Belhadj¹,

Bessrour²,

Masse³

et al. 2010

Journal of Materials Processing Technology

View full text Add to dashboard Cite

show abstract

“…The average Al concentration in the laser-treated layer was calculated as 11.7 wt.%, which was higher than the Al concentration of 9.0 wt.% in the as-received material. The increased average Al concentration in the melted zone is likely due to more Mg evaporation during the laser process [14,19,20].…”

Section: Microstructuresmentioning

confidence: 98%

Effect of laser surface melting on corrosion behaviour of AZ91D Mg alloy in simulated-modified body fluid

2009

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High corrosion rate in physiological environment of the body is the major drawback of magnesium alloys for their successful applications as biodegradable orthopaedic implants. In the present study, corrosion behaviour of AZ91D magnesium alloy after laser surface melting (LSM) was studied in modified-simulated body fluid at 37°C. The improved corrosion resistance of AZ91D alloy using LSM was found to depend on the solidification microstructure in the laser-melted zone. The general and pitting corrosion resistance of laser-treated surface was significantly enhanced due to the refined continuous network of b-Mg 17 Al 12 phases and the increased Al concentration in the laser-melted zone.

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“…And it is confirmed that the LPSO phase can be prepared by conventional casting method, in whose unit cell six close-packed planes of the magnesium crystal with a stacking sequence of ABCBCB¢ where A and B¢ layers are significantly enriched by Zn and Y. In fact, the LPSO phase is identified as X-Mg 12 YZn phase in the PDF file Card 36-1273 by the Joint Committee on Powder Diffraction Standards ( Ref 6).…”

Section: Introductionmentioning

confidence: 53%

Microstructure and Dry Sliding Wear Behavior of Mg-Y-Zn Alloy Modified by Laser Surface Melting

Liu

Wang

et al. 2010

J. of Materi Eng and Perform

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Mg-11Y-2.5Zn alloy was surface-melted using a 6.0 kW continuous wave CO 2 laser as a heat-generating source. X-ray diffractometer, laser optical microscopy, and Vickers hardness indentation were used to characterize the microstructure and hardness of the Mg-11Y-2.5Zn alloy. The results show that the microstructure in the laser-melted zone can be greatly refined and hardness is slightly improved. Dry sliding tests were performed on the as cast and laser surface-melted Mg-11Y-2.5Zn alloys using a pin-ondisk configuration. Coefficients of friction and wear rates were measured within a load range of 20-320 N at a sliding velocity of 0.785 m/s. Laser surface-melted Mg-11Y-2.5Zn alloy exhibited good wear resistance when compared with the as cast one under given applied load conditions, which has been explained by refining of the microstructure in the melted zone. Morphologies of worn surface on the as cast and laser surface-melted Mg-11Y-2.5Zn alloys were examined using scanning electron microscopy. Four wear mechanisms, namely abrasion, delamination, thermal softening, and melting, have operated.

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Microstructure analysis of magnesium alloy melted by laser irradiation

Cited by 50 publications

References 14 publications

Finite element simulation of magnesium alloys laser beam welding

Finite element simulation of magnesium alloys laser beam welding

Effect of laser surface melting on corrosion behaviour of AZ91D Mg alloy in simulated-modified body fluid

Microstructure and Dry Sliding Wear Behavior of Mg-Y-Zn Alloy Modified by Laser Surface Melting

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