Atomic mobilities and interdiffusivities in Ni-rich fcc Ni-Co-Cr and Ni-Al-Co-Cr systems evaluated using composition profiles and HitDIC
Atomic mobilities and interdiffusivities in Ni-rich fcc Ni-Co-Cr and Ni-Al-Co-Cr systems evaluated using composition profiles and HitDIC
复制标题
使用成分分布和 HitDIC 评估富镍面心立方 Ni-Co-Cr 和 Ni-Al-Co-Cr 系统中的原子迁移率和相互扩散率
DOI：
10.1016/j.jallcom.2021.158645
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发表时间：
2021
影响因子：
6.2
通讯作者：
Zhang Lijun
中科院分区：
文献类型：
--
作者：
Chen Juan;Xiao Jinkun;Lu Zhao;Wang Chengyin;Zhang Lijun
本文在富镍面心立方Ni-Co-Cr和Ni-Al-Co-Cr体系中制备了15个单相固/固扩散对，并通过电子探针显微结构分析技术确定了1423-1523 K下相应的Ni、Co、Cr和Al的浓度分布。借助 HitDIC 软件，直接根据现有的 15 个浓度分布建立了富镍 fcc Ni-Al-Co-Cr 系统中的原子迁移率描述。然后根据 fcc Ni-Al-Co-Cr 系统中已建立的原子迁移率以及报道的热力学描述，评估 fcc Ni-Co-Cr 和 Ni-Al-Co-Cr 合金中的相互扩散系数。通过与Ni-Co和Ni-Cr二元合金中相应的实验值进行比较，验证了面心立方Ni-Co-Cr合金中D̃CoCoNi和D̃CrCrNi的合理性。在Ni-Co-Cr合金和Ni-Al-Co-Cr合金中Cr的扩散速率均大于Co的扩散速率，并且在Ni-Al-Co-Cr合金中Al的扩散速率大于Cr。比较Ni-Al-Co和Ni-Al-Co-Cr合金中Co和Cr的扩散速率表明，Al的添加加速了Ni-Al-Co-Cr合金中Co和Cr的扩散，并且随着温度的升高，加速更加明显。
In this paper, 15 single-phase solid/solid diffusion couples in Ni-rich fcc Ni-Co-Cr and Ni-Al-Co-Cr systems were fabricated, and the corresponding concentration profiles of Ni, Co, Cr, and Al at 1423–1523 K were determined by means of the electron probe microstructure analysis technique. The atomic mobility descriptions in Ni-rich fcc Ni-Al-Co-Cr system were established directly from the present 15 concentration profiles with the aid of HitDIC software. The interdiffusion coefficients in fcc Ni-Co-Cr and Ni-Al-Co-Cr alloys were then evaluated based on the established atomic mobilities in fcc Ni-Al-Co-Cr system together with the reported thermodynamic descriptions. The reasonability of D ̃ CoCo Ni and D ̃ CrCr Ni in fcc Ni-Co-Cr alloy was validated by comparing with the corresponding experimental values in Ni-Co and Ni-Cr binary alloys. The diffusion rate of Cr is larger than that of Co in both Ni-Co-Cr and Ni-Al-Co-Cr alloys, and Al diffuses faster than Cr in Ni-Al-Co-Cr alloys. The comparison between the diffusion rates of Co and Cr in Ni-Al-Co and those in Ni-Al-Co-Cr alloys suggests the addition of Al speeds up the diffusion of Co and Cr in Ni-Al-Co-Cr alloys, and the acceleration is more pronounced as the temperature increases.