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中文摘要：
采用辉光等离子渗金属技术在碳钢表面制备了钨钼合金渗层和钨钼镝合金渗层,利用菲克第二定律计算了钨原子和钼原子的扩散激活能,分析了稀土镝可能存在的两种扩散模型。结果表明：在离子轰击和非平衡条件下,基体表面的空位浓度升高,合金元素的扩散激活能下降,使稀土镝的原子扩散速率增加,且对钨、钼原子的扩散产生促进作用;在扩散初期,稀土镝的扩散模型为＂空位交换扩散＂模型,在扩散进行到一定程度时为＂稀土-空位复合体＂模型。
英文摘要：
W-Mo alloying layer and W-Mo-Dy alloying layer were prepared on carbon steel surface by using glow plasma alloying technique, the diffusion activation energy of tungsten atoms and molybdenum atoms was calculated by Fick＇s Second Law, and two possible diffusion models of rare earth Dy were studied. The results show that under the conditions of ion bombardment and non-balance, vacancy concentration on substrate surface increasing and diffusion activation energy of alloy elements decreasing make the diffusion velocity of Dy increase and promote the diffusion of tungsten and molybdenum atoms. The diffusion model at deffusion preliminary stage is ＂vacancy exchange diffusion＂, once the diffusion process is to a certain degree, the diffusion model is ＂rare earth-vacancy complexes diffusion＂.
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