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采用高能球磨与热压烧结相结合的方法制备了5wt%n-Si C/7075铝基复合材料,研究了5wt%n-Si C对7075铝合金组织与性能的影响。结果表明:高能球磨后,5wt%n-Si C/7075铝基复合粉体较7075合金粉体明显细化。当转速350 r/min,球料比20:1,球磨时间20 h时,n-Si C均匀分布到7075合金颗粒中。由于n-Si C的均匀分布对7075铝合金产生细晶强化与弥散强化的作用,使得热压烧结温度为620℃,加压100 MPa,保温保压1h制备的5wt%n-Si C/7075铝基复合材料的致密度、硬度及抗压强度均优于相同工艺制备的7075铝合金,尤其抗压强度较7075铝合金提高约58.4%。
The effects of 5 wt% n-Si C on the microstructure and properties of 7075 aluminum alloy were investigated by using a combination of high energy ball milling and hot pressing sintering. The results show that 5wt% n-Si C / 7075 aluminum-based composite powder is obviously refined than 7075 alloy powder after high-energy ball milling. When the rotating speed of 350 r / min, the ball material ratio of 20: 1, ball milling time of 20 h, n-Si C uniformly distributed into the 7075 alloy particles. Due to the uniform distribution of n-Si C, the effect of fine grain strengthening and dispersion strengthening on 7075 aluminum alloy was achieved, and the hot-pressed sintering temperature was 620 ℃, the pressure was 100 MPa, The density, hardness and compressive strength of aluminum matrix composites are better than that of 7075 aluminum alloy prepared by the same process, especially the compressive strength is about 58.4% higher than 7075 aluminum alloy.