钨、钼、镝等离子共渗时镝的扩散行为及机理  

Diffusion Behavior and Mechanism of Dy with W-Mo-Dy Plasma Alloying

作　　者：韦文竹[1] 高原[1] 张维[1] 王成磊[1] 陆小会[1] 张光耀[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,桂林541004

出　　处：《机械工程材料》2015年第5期63-66,72,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51264007);国家自然科学基金青年基金资助项目(51201043);广西科学研究与技术开发科技攻关计划项目(桂科攻12118020-2-2-1);广西信息材料重点实验室项目(1210908-214-Z)

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。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＂.

关 键 词：稀土镝 扩散 空位 非平衡 

分 类 号：TG156[金属学及工艺—热处理]