Cu-Al合金添加稀土元素内氧化研究

• 作 者: 谢明 胡洁琼 程勇 张国全 杨有才 张吉明 陈永泰
• 机 构: 昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室,
• 出 处: 中国稀土学报
• 发表日期: 2014年06期
• 关键词: Cu-Al合金 内氧化法 第一性原理 氧化温度 铜基复合材料 氧化过程 导电率 性能变化 弥散强化 基体材料

研究了Cu-Al合金中添加稀土元素La的内氧化热力学。热力学计算结果表明:合金内氧化在热力学上是可行的,内氧化过程中La2O3较容易生成,且溶质Al,La合金元素较基体Cu更容易被氧化生成氧化物,并且La元素较Al元素更易氧化。由此说明,La的加入促进了合金内氧化过程的进行。铜基复合材料的导电率、硬度和密度均随着内氧化温度升高而增大。当内氧化温度超过900℃后,材料的性能变化趋于平缓。

The internal oxidation thermodynamics of rare earth element La in Cu-Al alloy was studied. The results of thermodynamic calculations show that the internal oxidation of the alloy is feasible thermodynamically and the La2O3 is easier to be generated during the internal oxidation. The solute Al and La alloy elements are more easily oxidized to oxide than the Cu matrix, and the La element is more easily oxidized than the Al element . This shows that the addition of La promoted the oxidation process within the alloy. The electrical conductivity, hardness and density of Cu-based composites increase with the increase of internal oxidation temperature. When the internal oxidation temperature exceeds 900 ℃, the performance of the material tends to be flat.