稀土Dy在等离子W-Mo-Dy共渗中的动力学行为  

Dynamic Behavior of Rare Earth Dy in Plasma W-Mo-Y Co-diffusion

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,广西桂林541004

出　　处：《稀有金属材料与工程》2014年第11期2719-2722,共4页Rare Metal Materials and 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(51201043);广西自然科学基金重点项目(2010GXN SFD013008);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(桂科能1210908-10-Z)

摘　　要：采用等离子渗金属技术在碳钢表面形成W-Mo共渗层和W-Mo-Dy共渗层,利用origin数值软件、菲克第二定律、阿累尼乌兹公式分析W、Mo、Dy在共渗中的动力学行为。结果表明：在表面0~5μm处,由于稀土Dy的加入使W、Mo原子的扩散系数分别提高了0.94倍和0.62倍,在80μm处,W-Mo-Dy共渗较W-Mo共渗W、Mo原子的扩散速度分别提高了2.87倍和1.07倍;稀土Dy的加入使表面5μm处的W、Mo原子的扩散激活能分别降低7.13和5.19k J/mol,使得90μm处W、Mo原子的扩散激活能分别降低32.20和10.83 k J/mol。在相同工艺条件下,W-Mo-Dy共渗表层控制扩散的主要因素是空位浓度,在次表面稀土Dy可降低W、Mo的扩散激活能。A plasma surface metallurgy technique was used on the surfaces of carbon steel to form W-Mo alloying layer and W-Mo-Y alloying layer. Dynamic behavior of W, Mo and Dy was investigated by origin software, Fick＇s second law and Arrhenius formula. Results show that Dy addition increases the diffusion coefficient of W and Mo by 0.94 times and 0.62 times, respectively in the diffusion layer from surface of 0-5μm while increases the diffusion rate of W and Mo by 2.87 times and 1.07 times, respectively in the diffusion layer from surface of 80 μm. However, the Dy addition decreases the activation energy of diffusion of W by 7.13 kJ/mol and Mo by 5.19 k J/mol from surface of 5μm, while it decreases the activation energy of diffusion of W by 32.20 and Mo by 10.18 kJ/mol from surface of 90μm. Under the same process condition, the main influence factor of diffusion in W-Mo-Dy co-diffusion layer is vacancy concentration. Dy decreases activation energy of diffusion of W and Mo in the subsurface.

关 键 词：菲克第二定律 阿尼乌兹公式 origin数值软件 扩散 扩散激活能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]