Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy

doi:10.1016/S1006-7191(08)60085-X

Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (3): 167-173.DOI: 10.1016/S1006-7191(08)60085-X

• Research paper • Previous Articles Next Articles

Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy

Yali GAO¹,Dangsheng XIONG¹, Cunshan WANG², Yongzhe CHEN²

1. School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2. State Key Laboratory for Materials Modification, Dalian University of Technology, Dalian 116024, China

Received:2008-05-28 Revised:2008-08-20 Online:2009-06-09 Published:2009-10-10
Contact: Yali GAO

Abstract

Abstract:

Al-Si alloy coatings were prepared on AZ91HP magnesium alloy by broad-beam laser cladding; the influences of the powers on the microstructure and properties of the coatings were discussed. It was found that the microstructure of the coatings at the powers of 3 and 3.5kW was characterized by Mg₂Si dendrites, and needle-like Mg₂Al₃(hcp) dispersing in the Mg₁₇Al₁₂ matrix, whereas the coating at the power of 2.5 kW was composed of the petal-like Mg₂Al₃(fcc) as well as the needle-like Mg₂Al₃(hcp). The coating at the power of 4 kW appeared as α-Mg solid solution and Mg₂Si, Mg₁₇Al₁₂, as well as Mg₂Al₃(hcp). The coatings with the powers of 3 and 3.5　kW exhibited higher microhardness and better wear resistance because of more Mg₂Si and Mg₁₇Al₁₂. However, the coating at the power of 2.5 kW displayed better corrosion resistance.

Key words: Magnesium alloy, Al-Si alloy, Laser cladding, Laser power

Yali GAO,Dangsheng XIONG,Cunshan WANG,Yongzhe CHEN. Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy[J]. Acta Metallurgica Sinica (English Letters), 2009, 22(3): 167-173.

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Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy

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