外应力驱动γ-TiAl合金片层演化

IF 3.6 3区材料科学 Q2 ENGINEERING, MECHANICAL

International Journal of Mechanics and Materials in Design Pub Date : 2025-02-13 DOI:10.1007/s10999-025-09742-y

Jicheng Zhuo, Zan Zhang, Ye Shan, Haiwei Zhang, Yongsheng Li

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引用次数: 0

摘要

具有全片层结构的α2 + γ两相γ- tial合金具有优异的力学性能，是航空发动机在应力和高温下工作的潜在叶片材料。本文采用相场模拟的方法研究了γ-TiAl合金在外加应力作用下纳米片层的演化和稳定性。外加应力影响了γ/γ和α2/γ界面的化学势和局部组成。拉伸应力使γ片层内部应力集中，加速了片层的分裂，加速了扩散诱导的γ片层粗化，形成更厚的片层。压应力抑制了γ片层的劈裂和粗化，细化了γ片层。结果表明，高温和外加应力作用下γ-TiAl合金中纳米片层的演化是由热-力耦合引起的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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External stress driving lamellar evolution in γ-TiAl alloys

The α₂ + γ two-phase γ-TiAl alloys with full lamellar structure exhibit excellent mechanical properties, which are potential blade materials for aero-engines working under stress and high-temperature. In this study, the evolution and stability of nano-lamella under external stress in γ-TiAl alloys are investigated by using phase-field simulation. The application of external stress affects the chemical potential and the local composition across the γ/γ and α₂/γ interfaces. The tensile stress quickens the lamellar splitting for the stress concentration within the γ lamella, and accelerates the diffusion-induced coarsening of the γ lamella to form thicker lamella. In contrast, the compressive stress inhibits the splitting and coarsening, and refines the γ lamella. The results reveal the thermo-mechanical coupling induced evolution of nano-lamella in the γ-TiAl alloys operating at high-temperature and external stress.

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来源期刊

International Journal of Mechanics and Materials in Design ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

6.00

自引率

5.40%

发文量

审稿时长

>12 weeks

期刊介绍： It is the objective of this journal to provide an effective medium for the dissemination of recent advances and original works in mechanics and materials'' engineering and their impact on the design process in an integrated, highly focused and coherent format. The goal is to enable mechanical, aeronautical, civil, automotive, biomedical, chemical and nuclear engineers, researchers and scientists to keep abreast of recent developments and exchange ideas on a number of topics relating to the use of mechanics and materials in design. Analytical synopsis of contents: The following non-exhaustive list is considered to be within the scope of the International Journal of Mechanics and Materials in Design: Intelligent Design: Nano-engineering and Nano-science in Design; Smart Materials and Adaptive Structures in Design; Mechanism(s) Design; Design against Failure; Design for Manufacturing; Design of Ultralight Structures; Design for a Clean Environment; Impact and Crashworthiness; Microelectronic Packaging Systems. Advanced Materials in Design: Newly Engineered Materials; Smart Materials and Adaptive Structures; Micromechanical Modelling of Composites; Damage Characterisation of Advanced/Traditional Materials; Alternative Use of Traditional Materials in Design; Functionally Graded Materials; Failure Analysis: Fatigue and Fracture; Multiscale Modelling Concepts and Methodology; Interfaces, interfacial properties and characterisation. Design Analysis and Optimisation: Shape and Topology Optimisation; Structural Optimisation; Optimisation Algorithms in Design; Nonlinear Mechanics in Design; Novel Numerical Tools in Design; Geometric Modelling and CAD Tools in Design; FEM, BEM and Hybrid Methods; Integrated Computer Aided Design; Computational Failure Analysis; Coupled Thermo-Electro-Mechanical Designs.