摘要
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 thermodynamics of internal oxidation of adding La into Cu-A1 alloy was investigated. The thermody- namic calculation results showed that the behavior of alloy internal oxidation is feasible in thermodynamics. La2 03 in the oxidation process is generated easily. The A1, La oxides are more easily to generate than the Cu substrate, and La is more easily oxidized than A1. It is showed that adding La into alloy was promoting the alloy oxidation process. The conductivity, hardness and density of the copper-based composite increased with the increasing of in- ternal oxidation temperature. When the temperature is above 900 ℃, changes of alloy properties are towards stabili- ty.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第6期736-743,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(u0837601
U1302272
51164015)
云南省创新团队项目(2012HC027)
昆明市创新团队项目(2012-01-01-A-R-07-0005)资助
关键词
CU-AL合金
内氧化
热力学
第一性原理
性能
稀土
Cu-A1 alloys
internal oxidation
thermodynamics
first principle
property
rare earths
