Acta Metallurgica Sinica (English Letters) >
Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy
Received date: 2008-05-28
Revised date: 2008-08-20
Online published: 2009-10-10
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 . DOI: 10.1016/S1006-7191(08)60085-X
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