Modeling Interdiffusion Processes in CMSX-10/Ni Diffusion Couple
Modeling Interdiffusion Processes in CMSX-10/Ni Diffusion Couple
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DOI：
10.1007/s11669-015-0444-9
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发表时间：
2016-01
影响因子：
1.4
通讯作者：
A. Chyrkin;A. Epishin;R. Pillai;T. Link;G. Nolze;W. Quadakkers
中科院分区：
文献类型：
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作者：
A. Chyrkin;A. Epishin;R. Pillai;T. Link;G. Nolze;W. Quadakkers
采用真空热压法制备了定向凝固镍与单晶镍基高温合金CMSX-10之间的扩散偶。扩散偶在1050和1250 °C之间的温度下进行热处理。用SEM/EBSD/EPMA对样品进行了表征。互扩散导致合金中γ′-Ni 3Al相的溶解和Ni晶粒向CMSX-10方向的长大。铝从高温合金中快速扩散到纯镍中导致高温合金中大量形成孔隙。使用有限元模拟软件DICTRA与数据库TCNi 5和MobNi 2，专门为镍基高温合金定制的相互扩散过程建模。从合金热力学角度讨论了合金元素对互扩散分布的影响。计算的元素浓度分布与电子探针测量结果吻合较好。相互扩散模型正确预测的浓度分布的形状，例如扭结的Al和Ti的档案在附近的原始接口在关节。该计算以合理的精度预测了柯肯达尔孔隙度的范围和位置。
A diffusion couple between directionally solidified nickel and the single crystal Ni-base superalloy CMSX-10 was produced by hot pressing in vacuum. The diffusion couples were heat treated at temperatures between 1050 and 1250 °C. The exposed samples were characterized by SEM/EBSD/EPMA. The interdiffusion results in dissolution of the γ′-Ni3Al in the superalloy and in growth of nickel grains towards CMSX-10. Rapid diffusion of aluminum from the superalloy into pure nickel leads to a significant formation of pores in the superalloy. The interdiffusion processes were modelled using the finite-element simulation software DICTRA with the databases TCNi5 and MobNi2, tailored specially for Ni-base superalloys. The effect of alloying elements on the interdiffusion profiles is discussed in terms of alloy thermodynamics. The calculated element concentration profiles are in good agreement with the EPMA measurements. The interdiffusion modeling correctly predicts the shapes of the concentration profiles, e.g. kinks on the Al and Ti profiles in the vicinity of the original interface in the joint. The calculation predicts with reasonable accuracy the extent and the location of the Kirkendall porosity.