摘要
The core-shell structure in bulk TiNb binary alloy was designed and studied by phase-field simulations,where various core-shell structures were obtained by precise control of the initial and boundary conditions of the TiNb binary alloy system during spinodal decomposition,and then the formation mechanism of core-shell structure was revealed.In addition,the influences of initial temperature gradient,average temperature,and initial concentration distribution of the system on the core-shell structure were investigated.Results show that the initial concentration gradient is the key factor for forming the core-shell structure.Besides,larger initial temperature gradient and higher average temperature can promote the formation of core-shell structure,which can be stabilized by adjusting the initial concentration distribution of the Nb-rich region in TiNb binary alloy.As a theoretical basis,this research provides a novel and simple strategy for the preparation of TiNb-based alloys and other materials with peculiar core-shell structures and desirable mechanical and physical properties.
采用相场模拟对块体TiNb二元合金中的核-壳结构进行了设计和研究,通过精确控制TiNb合金体系中调幅分解过程的初始和边界条件,以获得不同的核-壳结构,并揭示了核-壳结构的形成机理。此外,研究了体系初始温度梯度、平均温度和初始浓度分布对核-壳结构的影响。结果表明,初始浓度梯度是形成核-壳结构的关键因素。此外,较大的初始温度梯度和较高的平均温度能促使核-壳结构的形成,并可通过调节TiNb合金中富铌区的初始浓度分布来稳定核-壳结构。作为理论基础,本研究为制备具有特殊核-壳结构和理想力学与物理性能的TiNb基合金以及其它材料提供了一种新颖且简单的策略。
出处
《稀有金属材料与工程》
北大核心
2026年第5期1129-1136,共8页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(12372152)
Guangdong Basic and Applied Basic Research Foundation(2023A1515011819,2024A1515012469)
Shandong Provincial Natural Science Foundation(ZR2023MA058)。
