期刊
ACTA MATERIALIA
卷 51, 期 13, 页码 3861-3870出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(03)00210-6
关键词
intermetallic compound; NiAl; diffusion; activation volume
The intrinsic diffusivities of both components and the activation volume for interdiffusion in the B2 type NiAl phase have been measured in the high temperature region from 1473-1773 K. The activation volume for interdiffusion in 40-49 at%Al is found to be almost constant value of 1.0V(0) (V-0: molar volume of alloys) at 1473-1773 K, suggesting that divacancies contribute to the diffusion. Near 43 at%Al, the diffusion mechanism for Al atoms is most likely the triple defect mechanism with the activation energy of 320 kJmol(-1), while that of Ni atoms is probably the anti-structure bridge mechanism with the smaller activation energy of 240 kJmol(-1). However, at 50.5 at%Al, Al atoms diffuse by the nearest neighbor mechanism with the smaller activation energy (260 kJmol(-1)), whereas Ni atoms diffuse probably by the next nearest neighbor jump related to the triple defect with the larger activation energy (360 kJmol(-1)). (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据