纳米ZnO颗粒对过共晶Al-20Si合金组织和性能的影响  

Effects of Nano-Zn O Particles on Microstructure and Properties of Hypereutectic Al-20Si Alloy

作　　者：顾伟璐 陆从相[1] 孙瑜[2] 周鹏飞[1,2,3] GU Wei-lu;LU Cong-xiang;SUN Yu;ZHOU Peng-fei(Yancheng Vocational Institute of Industry Technology,School of Automotive and Transportation,Yancheng 224005,Jiangsu,China;Yancheng Institute of Technology,Material science and Engineering School,Yancheng 224051,Jiangsu,China;Soochow University School of Iron and Steel,Suzhou 215100,Jiangsu,China)

机构地区：[1]盐城工业职业技术学院汽车与交通学院,江苏盐城224005 [2]盐城工学院材料工程学院,江苏盐城224051 [3]苏州大学沙钢钢铁学院,江苏苏州215100

出　　处：《铸造》2020年第7期732-736,共5页Foundry

基　　金：2019校级创新团队项目(YGYKT-04);2019校级自然科学重点项目(ygy1904);2019江苏高校“青蓝工程”培养项目。

摘　　要：为研究Al-Si合金凝固过程中纳米颗粒如何影响Si相形貌,在Al-20Si半固态区间加入0.5wt.%ZnO纳米颗粒并机械搅拌,铸态Al-20Si-0.5ZnO复合材料的强度和伸长率显著提高。其中,伸长率提高5倍左右。金相及SEM组织显示初晶和共晶Si都得到了细化。初晶Si由星状转变为多面体状或块状,且其边缘及凹角更加圆整,共晶Si的宽度也更加细小。研究结果表明,ZnO加入后与熔融铝液发生还原反应生成Al2O3,同时细化了初晶Si和共晶Si,从而显著提高了合金的伸长率。To study how nanoparticles affect the morphology of the Si phase during the solidification.0.5 wt.%Zn O nanoparticles was added into Al-20Si alloy in the semi-solid state region and mechanically stirred.The strength and elongation of the as-cast Al-20Si-0.5ZnO composite were significantly improved.The elongation was increased by about five times.Metallographic structure and SEM images show that both primary and eutectic Si have been refined.The primary Si was transformed from a star shape to a polyhedron or blocky shape,and its edges and concave corners were more rounded,and the width of eutectic Si was also smaller.The results show that after the addition of Zn O,it undergoes a reduction reaction with the molten aluminum solution to generate Al2O3,and refines the primary Si and eutectic Si,thereby improves the elongation of the alloy significantly.

关 键 词：AL-SI合金 初晶SI 纳米颗粒 ZNO 伸长率 

分 类 号：TG146.2[一般工业技术—材料科学与工程]