(MgCuGd)_(100-x)Ti_x块状金属玻璃复合材料耐磨性能研究  

Abrasive Resistance of(MgCuGd)_(100-x)Ti_x BMG Composites

作　　者：李福山[1] 黄凤勇[1] 袁静慧[1] 孔超[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2008年第3期15-18,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省自然科学基金资助项目(72300440230)

摘　　要：通过加入轻金属元素Ti,采用铜模吸铸法成功地的制备出了以Mg65Cu25Gd10金属玻璃为基体的(Mg0.65Cu0.25Gd0.1)100-xTix(x=0,2.5,5和7.5)块状金属玻璃复合材料,该材料显示出了较高的比强度.借助盘销摩擦实验的方法着重研究了该块状金属玻璃复合材料的耐磨性能.试验结果表明,Mg基块状金属玻璃基体上晶化相Ti颗粒的形成能有效地提高该复合材料的抗磨损能力,并且随着Ti含量的增加,(Mg0.65Cu0.25Gd0.1)100-xTix(x=0,2.5,5和7.5)复合材料的硬度逐渐增大,而其磨损体积损失量呈现出先减小而后增大的趋势,当含Ti量的原子数分数达到5%时,该复合材料表现出最小的磨损体积损失量,该磨损体积损失值与单一的Mg65Cu25Gd10金属玻璃相比下降了20%.最后,从显微硬度及其压缩塑性的角度分析了Mg基块状金属玻璃复合材料的耐磨性能得到显著改善的机理.（ Mg0.65Cu0.25Gd0.1 ）100-x Tix（x =0, 2.5, 5 and 7.5） bulk metallic glass and composites were prepared by copper mould casting method. The samples exhibit high specific strength. The wear behavior was investigated with the pin-to-disc method. The result shows that the micro-hardness and the abrasive resistance of the composites are all improved with the addition of element Ti. The hardness of （Mg0.65 Cu0.25 Gd0.1）100-x Tix（x = 0, 2.5, 5 and 7.5 ） bulk metallic glass and composites are all increased with the increase of Ti content, while the wear volume loss of （Mg0.65Cu0. 25Gd0.1）100-xTix （x = 0, 2.5, 5 and 7.5） bulk metallic glass and composites show first decreasing and then increasing. The composite with optimal content of element Ti （5 % ） exhibiting the least wear-volume loss, which is decreased by about 20% compared with the Mg65Cu25Gd10 monolithic metallic glass. We analyzed the abrasive mechanism of the composites from the hardness and compressive ductility.

关 键 词：Mg基块状金属玻璃 复合材料 耐磨性 Ti元素 

分 类 号：TG139[一般工业技术—材料科学与工程]