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W–Ti合金互扩散及β结构稳定性研究

Study on the interdiffusion of W–Ti alloy and β phase stability

    摘要
  • 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1100~1300℃时，W基固溶体中的互扩散系数公式为2.6×10-5exp(-385.3/kT)，Ti基固溶体中的互扩散系数公式为4.1×10-2exp(-285.1/kT)，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。

     

    Abstract: The composition and microhardness of W/Ti diffusion couple prepared at different temperatures in the sameholding 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 farhigher than the diffusion speed of Ti in W. The W/Ti interdiffusion coefficient equations (unit: cm2·s-1) at 1100~1300℃ in tungsten and titanium solid solutions are expressed as 2.6×10-5exp(-385.3/kT) and 4.1×10-2exp(-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.

     

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