新型Laves相Mg(Cu_(1-x)Al_x)_2(x=0,0.25)的制备及表征  

Preparation of new type Laves phase Mg(Cu_(1-x)Al_x)_2(x=0,0.25) and its characterization

作　　者：周琦[1,2] 高海棠[1] 金孔杰[1] 张俊喜[3] 孟倩[1] 李福祥[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050 [3]兰州工业高等专科学校机械工程系,甘肃兰州730050

出　　处：《兰州理工大学学报》2009年第2期17-20,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(0803KJZA013);甘肃省高校研究生导师基金(0803-05)

摘　　要：采用机械活化+热压烧结法制备新型Laves相Mg(Cu1-xAlx)2(x=0,0.25),通过XRD、SEM及EPMA分析烧结产物的物相、微观形貌和微区成分,并用微压痕法测试其硬度及杨氏模量.结果表明,添加Al元素后,未改变MgCu2的晶体结构,Al替代Cu的原子位置,晶格常数增大,衍射峰向低角度偏移;Mg(Cu1-xAlx)2(x=0.25)的致密性、硬度及杨氏模量均大于MgCu2,其断口表面有少量韧性撕裂棱存在,韧性提高.说明用轻质、抗氧化性能高的Al元素进行合金化,能够使MgCu2结构Laves相性能提高.The Laves phase Mg（Cu1-xAlx）2（x=0,0.25） was prepared with the method of mechanical activation combining with hot-pressed sintering. The phase, microstructures, and micro-composition of the products were analyzed means of XRD, SEM, and EPMA. Hardness and Young＇s modulus of the products were measured by using nano-indenter. The result showed that, due to the addition of Al, the phase within the MgCu2 prototype was not changed; the Cu atoms in the MgCu2 were substituted by Al, the lattice constant increased and the diffraction peak shifted to the low angular position; the compactness, hardness and Young＇s modulus of the Mg（Cu1-xAlx）2（x=0,0.25） were higher than that of the MgCu2 ; There existed a small amount of toughness-tearing ridge on the fracture surface, the toughness increased. This showed that choosing Al with light density and high anti-oxidation as alloying element could improve the performance of Laves phase within MgCu2 structure.

关 键 词：LAVES相 热压烧结 MgCu2 性能 结构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]