挤压铸造对Al-Si-Cu合金组织与性能的影响  

Effect of Squeeze Casting Process on Microstructure and Mechanical Properties of Al-Si-Cu Alloy

作　　者：刘翊军[1] 周涛 

机构地区：[1]西华大学,四川成都610039 [2]四川创源建材工程有限公司,四川成都610039

出　　处：《铸造技术》2016年第11期2429-2432,共4页Foundry Technology

摘　　要：对体育器械用Al-Si-Cu合金进行了挤压铸造处理,研究了不同挤压铸造比压对合金硬度和显微组织的影响,并分析了挤压铸造合金不同区域的初生硅和枝晶形态。结果表明,随着挤压铸造比压的增加,合金的布氏硬度呈现先增加而后降低的趋势,在挤压铸造比压为630 MPa时取得硬度最大值;不同挤压铸造比压下的合金中都主要为块状的初生硅相、珊瑚状的共晶硅相、短棒状的Al2Cu相和鱼骨状的Al Si Cu Mg相;随着挤压铸造比压的增加,合金中的α-Al枝晶不断增大,而枝晶间距不断减小,同时初生硅的尺寸有所细小、棱角逐渐钝化。A1-Si-Cu alloy for sports equipment was prepared by squeeze casting process, the effect of different squeeze casting pressure on the hardness and microstructure of the alloy were studied, and the primary silicon and the dendrite morphology of the squeeze casting alloy in different regions were analyzed. The results show that, with the increase of squeeze casting pressure, the BrineU hardness of the alloy shows first increasing and then decreasing trend, it has a maximum value in the squeeze pressure of 630 MPa. The alloys with different extrusion pressure are mainly composed of massive primary silicon phase, coral like eutectic silicon phase, short rod Al2Cu phase and fishbone structure phase. With the increase of squeeze casting pressure, the number of α-A1 dendrite increases and the dendrite arm spacing decreases, also the size of primary silicon decreases, and the comers are gradually passivation.

关 键 词：挤压铸造 体育器械 铸造合金 显微组织 性能 

分 类 号：TG249.2[金属学及工艺—铸造]