Ce元素对固态扩渗铝AZ31镁合金的摩擦磨损特性的影响  

Effect of Ce Elements on Friction and Wear Characteristics of AZ31 Alloy After Solid Expansion

作　　者：潘丽君[1] 楚志兵[1] 黄庆学[1] 李茂林[2] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《热加工工艺》2014年第16期145-147,155,共4页Hot Working Technology

摘　　要：采用纯Al粉、Al-Ce混合固体粉末分别对AZ31镁合金表面进行热扩散处理,扩散温度均为430℃,扩散时间均为8 h,得到热扩散渗层,并对得到的渗层进行表面硬度、显微组织形貌和摩擦磨损性能分析。结果表明:渗层组织致密、均匀、连续,纯Al粉渗层厚25μm,Al-Ce粉末共渗得到的渗层厚度达35μm,渗层都表现出明显的扩散、沉积的分布特征,同时纯Al粉热扩散渗层的表面布氏硬度为62.4 HB,Al-Ce粉末共渗得到的渗层表面布氏硬度达到68.8 HB,并且纯Al粉热扩散渗铝试样的磨损质量损失仅为基材的1/2,而Al-Ce粉末共渗试样的磨损质量损失还不到基材的1/2,可见Ce元素加入更有利于渗层的形成,可显著提高固态扩散渗铝AZ31镁合金的摩擦磨损特性。The chemical thermal-diffusion treatment on the surface of AZ31 magnesium alloy by Al or Al and Ce solid mixed powder was carried out. The thermal diffusion coating was obtained at diffusion temperature of 430 ℃ for 8 h, then its microstructure morphology, surface hardness and friction and wear performane of the diffusion coating were analyzed. The results show that the coating is uniform, continuous and compact. Al powder boronizing layer＇s thickness is 25 μm, and the Al-Ce powder boronizing layer＇s thickness is 35μm, which presents obvious deposition＋difusion distribution characteristics.The surface micohardness of Al is up to 62.4 HB, and that of Al-Ce is up to 68.8 HB. The wear mass loss of Al powder boronizing layer is only 1/2 as much as that of AZ31 matrix, and the Al-Ce is less than 1/2 as much as that of AZ31 matrix. Ce element is conducive to the infiltration layer formation. The wear resistance of AZ31 alloy after thermal diffusion with added Ce elements increases significantly.

关 键 词：AZ31 CE 固态热扩散 摩擦磨损 

分 类 号：TG174[金属学及工艺—金属表面处理]