La_2O_3对微波烧结Cu_(20)Fe_(80)合金组织性能的影响

采用机械合金化和冷压微波烧结法制备了Cu_(20)Fe_(80)合金,研究了La_2O_3添加对Cu_(20)Fe_(80)合金组织性能的影响,利用扫描电子显微镜和X射线衍射仪等设备观察和分析Cu_(20)Fe_(80)合金组织形貌和相组成,并测定了合金的致密度和硬度。结果表明:Cu_(20)Fe_(80)合金粉体呈层片状,随La2O3质量分数的增加,合金粉体得到细化,机械合金化程度增强;Cu_(20)Fe_(80)合金粉体的冷压压坯组织呈层片状,随La_2O_3质量分数的增加,压坯致密程度和成型性提高;微波烧结后组织呈现层片状,随La_2O_3质量分数的增加,空隙先减少后增加,烧结组织致密度和硬度先提高后减小;综合分析,La_2O_3最佳添加量为0.2%。

Effect of La2O3 addition on the microstructures and properties of Cu20Fe80 alloy prepared by microwave sintering

Cu20Fe80 alloys were prepared by mechanical alloying and cold pressing microwave sintering, the effect of La2O3 addition on microstructures and properties of the Cu20Fe80 alloy prepared by microwave sintering was investigated. The microstructures and phase composition of the Cu20Fe80 alloy were analyzed by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The density and hardness of the Cu20Fe80 alloys were measured by Rockwell hardometer. The results show that, the Cu20Fe80 alloy powders present the flake layered structure, the powders are refined and the mechanical alloying is enhanced with increasing La2O3 content. The microstructures of cold pressed compaction of Cu20Fe80 alloy are lamellar, the density of cold pressed compaction increases and the formability is improved with the increase of La2O3 content. The microwave sintered microstructures of Cu20Fe80 alloy show the lamellar structure, with the increase of La2O3 content, the voids of the microwave sintered Cu20Fe80 alloy reduces first then increases, and the density and the hardness increase first and then decrease; in conclusion, the best La2O3 content is 0.2% by mass.