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| 1 | 新型钴基与Nb-Si基高温合金扩散动力学研究进展显示文摘扩散动力学信息是深入理解合金的相变机制、微观组织形成和演化机理的关键参数,也是实现新型钴基与Nb-Si基高温合金设计与研发必要的基础物性数据。首先,本文系统地归纳了高温合金中常见的合金化元素及其作用。随后,详细介绍了合金体系中自扩散系数与杂质扩散系数的机器学习计算方法、互扩散系数的实验测定方法以及示踪扩散系数的分子动力学计算方法,并介绍了本课题组在新型钴基与Nb-Si基高温合金多元扩散动力学数据库建立与完善方面的工作。最后,介绍了扩散动力学数据库在微观组织模拟、合金设计等领域的应用,并对扩散动力学数据库的完善及应用方面的发展进行了展望。 | 刘兴军 魏振帮 卢勇 韩佳甲 施荣沛 王翠萍 | 2023 | 金属学报2023，59，8： | 0 |
| 2 | Temperature gradient driving interdiffusion interface and composition evolution in Ni-AI-Cr alloys显示文摘The interdiffusion interface microstructures and composition evolution of Ni-Al-Cr/Ni-Al-Cr layered alloys under different temperature gradients were studied using phase-field simulation.A precipitate-free zone forms near the interface of the layered alloys,and the interface does not move with time under temperature gradients.When Cr concentrations in the alloy layers are different,Al diffuses from a low-to high-temperature region,whereas Cr from a high-to low-temperature region.The width of the precipitate-free zone changes from 0.5 to 2.5μm as the temperature gradient changes fromΔT=0.625 K·μm^(−1) to 1.250 K·μm^(−1);the width of the interdiffusion zone is also enlarged.Additionally,the temperature gradient promotes the interdiffusion of elements through the interface.In contrast,when the initial Al concentration is different in the alloy layers,an uphill diffusion of Al occurs,which is driven by the chemical potential of Al. | Yong-Sheng Li Hui-Yu Wang Jing Chen Shuai-Ge Yang Peng Sang Hong-Li Long | 2022 | Rare Metals2022，41，9： | 0 |
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