Wear and corrosion properties of laser cladded Cu47Ti34Zr11Ni8/SiC
amorphous composite coatings on AZ91D magnesium alloy
amorphous composite coatings on AZ91D magnesium alloy
(1. State Key Laboratory of Materials Processing and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China;
2. State Key Laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China;
3. State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams,
Dalian University of Technology, Dalian 116024, China;
4. Guangxi Key Laboratory of Information Materials,
Guilin University of Electronic Technology, Guilin 541004, China)
Huazhong University of Science and Technology, Wuhan 430074, China;
2. State Key Laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China;
3. State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams,
Dalian University of Technology, Dalian 116024, China;
4. Guangxi Key Laboratory of Information Materials,
Guilin University of Electronic Technology, Guilin 541004, China)
Abstract: To improve the wear and corrosion properties of AZ91D magnesium alloys, Cu-based amorphous composite coatings were fabricated on AZ91D magnesium alloy by laser cladding using mixed powders of Cu47Ti34Zr11Ni8 and SiC. The wear and corrosion behaviours of the coatings were investigated. The wear resistance of the coatings was evaluated under dry sliding wear condition at room temperature. The corrosion resistance of the coatings was tested in 3.5% (mass fraction) NaCl solution. The coatings exhibit excellent wear resistance due to the recombined action of amorphous phase and different intermetallic compounds. The main wear mechanisms of the coatings and the AZ91D sample are different. The former is abrasive wear and the latter is adhesive wear. The coatings compared with AZ91D magnesium alloy also exhibit good corrosion resistance because of the presence of the amorphous phase in the coatings.
Key words: magnesium alloy; AZ91D alloy; laser cladding; wear; corrosion; amorphous phase