Investigation on the Microstructures and Properties of Vacuum Diffusion Brazed Joints for SiCp/A356 Composites with High SiC Content
WANG Peng1, GAO Zeng1, CHENG Dongfeng1, NIU Jitai1,2
1 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003; 2 Henan Jingtai High-Novel Materials Ltd. of Science and Technology, Jiaozuo 454003
Abstract: Using (Al-33.3Cu-6.0Mg)-xNi (wt.% x=0, 0.5, 1.0, 2.0, 3.0, 4.0, 5.0) filler metal foils obtained by rapidly melt-spun technique, vacuum brazed joints of 55% SiCp/A356 composites with and without electroless Ni-P alloy coating were obtained, and their microstructures and bonding strength were analyzed by SEM, EDS and shearing test respectively. Results show that the solidus-liquidus temperatures of the developed foils are close to 504—522 ℃. Without Ni-P alloy coating and using(Al-33.3Cu-6.0Mg)-3Ni filler metal, compact joints were obtained at 570 ℃ and soaking time of 30 min and its shear strength achieved to 64.97 MPa. In the case, proper interdiffusion and dissolution between A356 matrix/filler metal interfaces occurred rather than defect of melting corrosion at 585 ℃, and reaction layer was obtained along the part of filler metal/SiCp interfaces because of chemical reaction with active Mg element effect. While with Ni-P alloy coating, compact reaction layers rich in Al and Ni elements tended to be formed along the A356 matrix/Ni-P alloy coating/filler metal foil interfaces at 570 ℃ and soaking time of 30 min. Consequently, the joint adhesion was improved significantly and a higher shear strength of 79.96 MPa was obtained by using (Al-33.3Cu-6.0Mg)-4Ni filler metal foil.
王鹏,高增,程东锋,牛济泰,. 高体积比SiCp/A356复合材料真空扩散钎焊接头组织与性能研究*[J]. 材料导报编辑部, 2017, 31(22): 75-78.
WANG Peng, GAO Zeng, CHENG Dongfeng, NIU Jitai,. Investigation on the Microstructures and Properties of Vacuum Diffusion Brazed Joints for SiCp/A356 Composites with High SiC Content. Materials Reports, 2017, 31(22): 75-78.
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2017, Vol. 31 
