研究目的
To solve the problems of low hardness and corrosion resistance of magnesium alloys by laser cladding Al-TiC cladding layer with different mass ratio and adding different content of rare earth Y2O3 powder on the surface of magnesium alloys.
研究成果
1) Al-TiC laser cladding coatings with different mass ratios are metallurgically bonded with AZ63-Er alloy matrix, no defects such as porosity and cracks are found at the interface. The main phases of Al-TiC laser cladding layers with different mass ratios are Ti3AlC, TiC, Mg2Al3, Al3Mg2, Al, Mg, AlMg and Ti6O.
2) The hardness of laser cladding layer are about 2.75, 3.24 and 3.94 times of AZ63-Er alloy substrate when the mass ratio of Al:TiC is 8:1, 4:1 and 2:1, respectively. The corrosion resistance of laser cladding layer is higher than that of the AZ63-Er alloy substrate, and the coating with the mass ratio of Al:TiC is 8:1 has the best corrosion resistance.
3) Al3Y and Al4MgY phases are newly formed in the Al-TiC-Y2O3 cladding layer after adding Y2O3, while Ti3AlC, Ti6O phases and various Al-Mg intermetallic compounds still exist, and the hardness of Al-TiC-Y2O3 cladding layer is increased by adding Y2O3. The Al-TiC-Y2O3 composite cladding layer has the best hardness and corrosion resistance when the Y2O3 content is 0.6%.
研究不足
The study focuses on the effects of Al:TiC mass ratio and Y2O3 addition on the properties of the cladding layer, but does not explore the effects of other potential additives or different laser cladding parameters.
1：Experimental Design and Method Selection:
Laser cladding technology was used to prepare Al-TiC and Al-TiC-Y2O3 cladding layers on the AZ63-Er alloy. The effects of Al:TiC mass ratio and Y2O3 addition on the microstructure, phase composition, hardness and corrosion resistance of the cladding layer were studied.
2：Sample Selection and Data Sources:
The experimental material is the die-cast AZ63-Er alloy. The sizes of the selected base materials is 25 mm × 20 mm × 4 mm.
3：List of Experimental Equipment and Materials:
LASKIT-500 multifunctional solid-state laser, CNC2000 laser processing numerical control system, high purity argon (99.99%), 300 mesh Al powder (99.4%), 1000 mesh TiC powder (99.96%), and 200 mesh Y2O3 powder (99.92%).
4：99%), 300 mesh Al powder (4%), 1000 mesh TiC powder (96%), and 200 mesh Y2O3 powder (92%).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Mixed powders were fully stirred and evenly mixed, and then mixed into water glass to obtain the award. The powders were evenly coated on the surface of AZ63-Er alloy substrate until the coating thickness was about 0.45 mm, and then it dries naturally in the air for 48 h. The laser cladding was carried out by using LASKIT-500 multifunctional solid-state laser.
5：45 mm, and then it dries naturally in the air for 48 h. The laser cladding was carried out by using LASKIT-500 multifunctional solid-state laser.
Data Analysis Methods:
5. Data Analysis Methods: The microhardness of cladding layer and base material was measured by HMV-G21ST microhardness tester. The electrochemical corrosion characteristics were carried out in Princeton P4000A electrochemical workstation with the standard three-electrode system.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
