摘要
通过测量相同时间、不同温度下制备的W/Ti扩散偶成分和显微硬度,研究了W–Ti合金的扩散特性和机理,计算了W/Ti互扩散系数(单位:cm2·s-1),并利用MS软件对Ti原子数分数为12.5%50%的W–Ti二元合金的能量、电子结构进行了理论计算。结果表明:W与Ti发生互扩散,其中W在Ti中的扩散速度远高于Ti在W中的扩散速度;在11001300℃时,W基固溶体中的互扩散系数公式为2.6×10-5exp（-385.3/k T）,Ti基固溶体中的互扩散系数公式为4.1×10-2exp（-285.1/k T）,其中,T为扩散温度,k为扩散距离;随着Ti原子数分数的升高,W–Ti合金的β结构稳定性降低。
The composition and microhardness of W/Ti diffusion couple prepared at different temperatures in the same holding time were analyzed to study the interdiffusion of W–Ti alloy,the W/Ti interdiffusion coefficients were calculated,and the energy and electronic structure of W–Ti binary alloy in the Ti atomic fraction of 12.5%50% were calculated by MS software.The results show that the diffusion speed of W in Ti is far higher than the diffusion speed of Ti in W.The W/Ti interdiffusion coefficient equations(unit: cm2·s-1) at 11001300 ℃ in tungsten and titanium solid solutions are expressed as 2.6×10-5 exp（-385.3/kT） and 4.1×10-2 exp（-285.1/kT）,respectively,T is diffusion temperature,k is diffusion distance; the β phase stability of W–Ti alloy decreases monotonously with the increasing of Ti content.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2018年第1期3-8,共6页
Powder Metallurgy Technology
基金
陕西省西部军民融合产业发展研究院专项基金资助项目(17JMR22)
