Microstructure and mechanical properties of siliceous rock/A356 composites for construction prepared by spray forming
LI Kui1, ZHANG Zhaofang1, MA Nan2, LI Ming3
1. Henan Vocational College of Architecture, Department of Civil Engineering, Zhengzhou 450064, China; 2. School of Information and Business, Zhongyuan University of Technology, Xinzheng 450007, China; 3. Henan Institute of Building Science Co., Ltd., Zhengzhou 450064, China
Abstract The A356 aluminum alloys and siliceous rock particles reinforced A356 aluminum matrix composites (mass fraction of siliceous rock particles is 4.5%) were prepared by spray molding. The interface structure, aluminum matrix structure and mechanical properties were compared. The results showed that all of the siliceous rock particles could be captured and uniformly distributed in the aluminum matrix during the spray forming. The siliceous rock particles formed a good mosaic structure in the aluminum matrix, and did not fall off during the double-spray electrolysis. Many dislocations were formed in the area close to the particle/matrix interface. The Si content in the Al matrix near the interface was higher, while the amount of other elements remained unaltered. Compared with A356 aluminum alloy, the tensile strength of siliceous rock/A356 composites increased from 603 MPa to 662 MPa, and the elongation increased from 3.52% to 3.92%. Both of the A356 alloy and siliceous rock/A356 composite were ductile fracture. The tensile fracture surface of siliceous rock/A356 composites was pitted by the pulled-out grains of siliceous rock, and many debris were generated.
LI Kui,ZHANG Zhaofang,MA Nan, et al. Microstructure and mechanical properties of siliceous rock/A356 composites for construction prepared by spray forming[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 358-362.
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2020, Vol. 25 
