Y_2O_3表面改性Al_2O_(3P)增强6061Al复合材料组织与性能  

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Y_2O_3 MODIFIED-Al_2O_3 PARTICLE /6061Al COMPOSITES

作　　者：于志强[1] 武高辉[1] 姜龙涛[1] 陈剑锋[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《复合材料学报》2003年第5期22-27,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金资助项目(59771014和50071019)

摘　　要：　采用液相包裹法对Al2O3微粉进行稀土Y2O3表面改性,用挤压铸造法制备表面经稀土Y2O3改性的Al2O3P/6061Al复合材料,并对复合材料的显微组织及拉伸性能进行分析和研究。结果表明:表面经稀土Y2O3改性的Al2O3微粉能均匀的分布于基体中,界面润湿性得以改善,复合材料组织更加均匀。TEM观察表明:改性粉体在制备复合材料前后表面存在颗粒状包裹层。对其表面进行EDAX分析,结果显示含有Y,Al和O元素。粉体XRD图谱中有Y2O3衍射峰的存在。拉伸性能测试表明:改性粉体对Al合金增强效果明显增加,抗拉强度提高29.8%,屈服强度提高38.4%,延伸率提高10.3%。对拉伸断口进行SEM分析,改性后复合材料断口韧窝更加均匀、丰满,材料表现出良好的塑性。The liquid encapsulated approach was used in rareearth modification on the surface of αAl2O3 micro powder in this paper. Then the aluminum matrix composite reinforced by the αAl2O3 particles that had been modified by Y2O3 was fabricated using the squeezecasting technique. And the microstructure and tensile properties of the composites were analysed and studied. The result showed that αAl2O3 micro powders modified by Y2O3 were distributed uniformly in the aluminum liquid. The interfacial wettability was improved. The microstructure of the composites was more even.The TEM observation showed that the αAl2O3 powders were encapsulated homogeneously. EDAX analysis indicated that the powder surfaces included high content of Y and Al elements. And the diffraction peak of Y2O3 was also found in the Xray diffraction spectrum graph. The tensile testing indicated that the strengthening effect of the modifiedAl2O3 on Al alloy was improved obviously and the tensile strength of composites was improved 29.8 %,the yield strength was increased 38.4 % and the elongation was ncreased 10.3 %.The SEM analysis of the fracture indicated that the dimples of the modifiedAl2O3P/6061Al composites were more even and the material embodied good plastics.

关 键 词：Al2O3微粉表面改性 铝基复合材料 微观组织 力学性能 稀土 

分 类 号：TB331[一般工业技术—材料科学与工程]