Cu基块体非晶合金的高温均匀塑性流变行为研究  

Study of High Temperature Homogeneous Plastic Flow of Cu-based Bulk Amorphous Alloy

作　　者：贾元波 高健华 江志军 

机构地区：[1]四川有色新材料科技股份有限公司,四川成都610000

出　　处：《四川有色金属》2013年第4期43-47,共5页Sichuan Nonferrous Metals

摘　　要：本文选用非晶形成能力高,且在玻璃转变区和过冷液相区有高热稳定性的Cu46Zr47-x Al7块体非晶合金为研究对象,利用差示扫描量热分析（DSC）、高温真空压缩实验等方法,对其高温均匀塑性流变行为进行研究。结果表明,Cu46Zr47Al7块体非晶合金的高温均匀塑性形变行为依赖于温度和应变速率,随着温度的降低或应变速率的增大呈现出牛顿流变向非牛顿流变的转变,该行为可以用基于自由体积的过渡态理论来进行定量描述。根据过渡态理论拟合出来的驱动体积大致相当于25~50个原子,驱动能为551kJ/mol,说明控制合金高温均匀形变的原子不会脱离周围原子而单独跃迁,其扩散涉及到多原子的协同运动。In this dissertation, Cu-based bulk amorphous alloys Cu46Zr47-xAl7, which exhibits good glass tormlng ability （GFA） and high thermal stability against crystallization at glass transition as well as in supercooled liquid region, has been chosen to be the model materials to study. By differential scanning calorimetry （DSC）,and vacuum compression experiments,High temperature homogeneous plastic flow of Cu-based bulk amorphous alloy has been researched. That results showed that：High temperature homogeneous plastic flow of Cu-based bulk amorphous alloy depends on the temperature and strain rate. At low strain rates or high temperature,the Cu46Zr47Al7 alloy exhibits a Newtonian behavior whereas at high strain rates and low temperature, a non-Newtonian behavior is observed. It is shown that the experimental results can be successfully described by the transition state theory based on a free volume concept. From the experimental data, the activation volume, and activation energy for the homogeneous plastic flow of the supercooled metallic liquid are determined to be about 25~50 atoms and 551kJ/mol respectively, indicating that the homogeneous plastic flow follows the large-scale atomic cooperative movement mechanism.

关 键 词：块状非晶合金 高温均匀塑性流变 牛顿流变 非牛顿流变 过渡态理论 

分 类 号：TG139.8[一般工业技术—材料科学与工程]