Broad-beam laser cladding of Al–Cu alloy coating on AZ91HP magnesium alloy

Obvious physical process differences exist between overlapping area and non-overlapping area by broad-beam laser cladding,also the parallel and vertical interface of RP.By comparing the microstructure and performance, the result shows: the microstructure of overlapping area has broken crystal,the size of overlapping area crystal is bigger than the non-overlapping one.Repeated heating makes overlapping area secondary dissolving out and having higher rigidity;Between layer and layer of broad-beam laser cladding RP is metallurgical combination completely,the degree of uniformity of central microstructures performance is good,hardness of the bow shape area between overlapping layer and matrix is greatly increased.

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Wear and Corrosion Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy Coating Deposited on AZ91D Magnesium Alloy by Laser Cladding

Entropy ◽

10.3390/e20120915 ◽

2018 ◽

Vol 20 (12) ◽

pp. 915 ◽

Cited By ~ 4

Author(s):

Kaijin Huang ◽

Lin Chen ◽

Xin Lin ◽

Haisong Huang ◽

Shihao Tang ◽

...

Keyword(s):

Wear Resistance ◽

Corrosion Resistance ◽

Magnesium Alloy ◽

Laser Cladding ◽

Alloy Coating ◽

High Entropy Alloy ◽

High Entropy ◽

Az91d Magnesium Alloy ◽

Wear And Corrosion ◽

Wear And Corrosion Resistance

In order to improve the wear and corrosion resistance of an AZ91D magnesium alloy substrate, an Al0.5CoCrCuFeNi high-entropy alloy coating was successfully prepared on an AZ91D magnesium alloy surface by laser cladding using mixed elemental powders. Optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction were used to characterize the microstructure of the coating. The wear resistance and corrosion resistance of the coating were evaluated by dry sliding wear and potentiodynamic polarization curve test methods, respectively. The results show that the coating was composed of a simple FCC solid solution phase with a microhardness about 3.7 times higher than that of the AZ91D matrix and even higher than that of the same high-entropy alloy prepared by an arc melting method. The coating had better wear resistance than the AZ91D matrix, and the wear rate was about 2.5 times lower than that of the AZ91D matrix. Moreover, the main wear mechanisms of the coating and the AZ91D matrix were different. The former was abrasive wear and the latter was adhesive wear. The corrosion resistance of the coating was also better than that of the AZ91D matrix because the corrosion potential of the former was more positive and the corrosion current was smaller.

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Composition Design and Laser Cladding of Cu-Zr-Al Alloy Coating on the Magnesium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.1872 ◽

2010 ◽

Vol 654-656 ◽

pp. 1872-1875 ◽

Cited By ~ 2

Author(s):

Cun Shan Wang ◽

Ting Li ◽

Biao Yao ◽

Rui Wang ◽

Qing Wang

Keyword(s):

Wear Resistance ◽

Magnesium Alloy ◽

Laser Cladding ◽

High Hardness ◽

Alloy Coating ◽

Relative Content ◽

Al Alloy ◽

Optimized Design ◽

Clad Layer ◽

Metallurgical Bond

The cluster line criterion was used for optimized design of a Cu-Zr-Al alloy used as coating on the AZ91HP magnesium alloy by laser cladding. Results show that the coating mainly consists of an amorphous, Cu8Zr3, and Cu10Zr7 phases, of which the relative content of amorphous phase is estimated to be 61 %. The formation of the amorphous and intermetallics composite structure results in high hardness, good wear resistance and corrosion resistance. The interface between the clad layer and the substrate has good metallurgical bond.

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