机械合金化的Cu基纳米晶合金热力学稳定性

材料开发与应用, 2014, 29(4): 64-72.

机械合金化的Cu基纳米晶合金热力学稳定性

李玳 ^1, , 周世同 ^2, , 李鹏 ^3, , 吕潍威 ^4, , 陶静梅 ^5, , 朱心昆 ^6,

1.昆明理工大学材料科学与工程学院,云南昆明650093;昆明理工大学津桥学院,云南昆明650106

2.昆明理工大学材料科学与工程学院,云南昆明650093

3.昆明理工大学材料科学与工程学院,云南昆明650093

4.昆明理工大学材料科学与工程学院,云南昆明650093

5.昆明理工大学材料科学与工程学院,云南昆明650093

6.昆明理工大学材料科学与工程学院,云南昆明650093

基金项目: National Basic Research Program of China,No.50874056.(国家自然科学基金50874056号)

关键词：纳米晶合金 , 机械合金化 , 热力学稳定 , 晶界偏聚

Thermodynamic Stabilization of Mechanical Alloying Cu Based Nanocrystalline Alloys

Keywords： nanocrystalline alloy , mechanical alloying , thermodynamics stabilization , grain boundary segregation

在纳米结构的金属及合金中,随着晶粒尺寸的下降,晶界体积分数显著增加,使得晶粒长大的驱动力提高,因此纳米金属在加热时(甚至是室温下)是不稳定的,限制了其加工与应用.本文对Trelewicz/Schuh (TS)模型进行了修正,并利用修正的模型对Cu-6.5at％ Zr、Cu-6.5at％ Nb纳米晶合金的热力学稳定倾向进行了计算研究.实验利用机械合金化的方法制备这两种纳米晶合金,并在不同温度下进行退火.实验结果及理论计算表明,随着溶质原子的加入及在晶界的偏聚,这两种纳米晶合金的晶粒长大得到抑制,热力学稳定性提高.

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