Simultaneous enhancement of strength and toughness in TiAl composites via ductile Nb particle addition

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-13 DOI:10.1016/j.intermet.2025.108878

Jiangfei Yan , Dongdong Zhu , Duo Dong , QiBin Wang , Maoliang Hu , Ye Wang

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引用次数: 0

Abstract

Enhancing the toughness of TiAl alloys remains a critical problem urgently requiring resolution. This study demonstrates that the incorporation of 5 vol% ductile Nb particles into the Ti-45Al-8Nb matrix via the spark plasma sintering (SPS) technique simultaneously enhances strength and toughness. The microstructure evolution at the interface between the Nb particles and the matrix was investigated, while the micro-mechanical properties of the interface phases and the toughening mechanisms were analyzed. The results indicate that a multi-layer interface structure is formed between Nb particles and TiAl powders through atomic diffusion reactions involving Nbr/σ/σ+B2/B2+γ/matrix zones. The (B2+γ) reaction layer achieves a gradient transformation of the elastic modulus between the residual Nb particles and the matrix (165 GPa→150 GPa→147 GPa→140 GPa), thereby alleviating the deformation inhomogeneity at the interface. The Nb/TiAl composite prepared at 1250 °C exhibits excellent room-temperature compressive strength (2417 MPa) and fracture toughness (16.85 MPa m^1/2), representing 14.8 % and 13.1 % enhancements compared to pure Ti-45Al-8Nb alloy. These enhancements primarily originate from plastic tearing, interfacial debonding, and bridging of the residual Nb particles. The tough B2 and γ phases in the Nb-rich region improve toughness by reducing fracture energy through crack deflection and branching.

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通过添加延展性Nb颗粒同时增强TiAl复合材料的强度和韧性

提高TiAl合金的韧性是一个迫切需要解决的关键问题。本研究表明，通过放电等离子烧结（SPS）技术，在Ti-45Al-8Nb基体中加入5vol %延展性Nb颗粒，同时提高了强度和韧性。研究了Nb颗粒与基体界面处的微观组织演变，分析了界面相的微观力学性能和增韧机理。结果表明：通过原子扩散反应，Nb颗粒与TiAl粉末之间形成了包含Nbr/σ/σ+B2/B2+γ/基体区的多层界面结构；（B2+γ）反应层实现了残余Nb颗粒与基体之间弹性模量的梯度转变（165 GPa→150 GPa→147 GPa→140 GPa），从而减轻了界面处的变形不均匀性。在1250℃下制备的Nb/TiAl复合材料具有优异的室温抗压强度（2417 MPa）和断裂韧性（16.85 MPa m1/2），分别比纯Ti-45Al-8Nb合金提高14.8%和13.1%。这些增强主要源于残余Nb颗粒的塑性撕裂、界面脱粘和桥接。富铌区坚韧的B2和γ相通过裂纹偏转和分支降低断裂能提高韧性。

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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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.