Synergistically enhancing the strength and ductility of TiAl alloy through in-situ precipitation of Ti2AlC and TiB2 nanoparticles

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-27 DOI:10.1016/j.intermet.2025.108853

Dingbang Sun , Yingchao Guo , Huijun Wang , Yongfeng Liang , Junpin Lin , Hui Xue

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引用次数: 0

Abstract

In our previous research, the tensile properties of the sintered TiAl + xB₄C composites were significantly enhanced with the addition of nano-B₄C at both room temperature and elevated temperature. However, these composites demonstrated almost no ductility at room temperature. In this study, heat treatment was applied to Ti₂AlC/TiB₂-Ti-48Al-7Nb-(V, Cr) composites to enhance their ductility. Additionally, an investigation of the evolution of the microstructure and tensile properties was carried out at room temperature and elevated temperature. The results indicate that a greater number of Ti₂AlC nanoparticles precipitated at the interface of the lamellae, while the content of α₂ phase decreased following heat treatment. At room temperature, after being heat-treated at 900 °C for 48 h, the elongation significantly improved from 0.11 ± 0.03 % to 0.53 ± 0.04 %. However, the ultimate tensile strength slightly decreased from 631 ± 28 MPa to 602 ± 10 MPa. At elevated temperatures (800 °C), the elongation increased from 2.2 ± 0.2 % to 7.3 ± 0.8 %, while the ultimate tensile strength remained similar, measuring 627 ± 19 MPa and 624 ± 12 MPa, respectively. Compared to the TiAl alloy without the addition of nano-B₄C, both the strength and elongation of the composites have significantly improved following heat treatment.

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原位析出Ti2AlC和TiB2纳米颗粒，协同提高TiAl合金的强度和延展性

在我们之前的研究中，在室温和高温下，添加纳米b4c都能显著增强烧结TiAl + xB4C复合材料的拉伸性能。然而，这些复合材料在室温下几乎没有延展性。在本研究中，对Ti2AlC/TiB2-Ti-48Al-7Nb-(V, Cr)复合材料进行热处理以提高其延展性。此外，还研究了室温和高温下的微观组织和拉伸性能的演变。结果表明：热处理后，Ti2AlC纳米颗粒在片层界面析出较多，α2相含量降低；在室温下，900℃热处理48 h后，伸长率由0.11±0.03%显著提高到0.53±0.04%。而极限抗拉强度从631±28 MPa略微下降至602±10 MPa。在800℃的高温下，伸长率从2.2±0.2%提高到7.3±0.8%，而拉伸强度保持不变，分别为627±19 MPa和624±12 MPa。与未添加纳米b4c的TiAl合金相比，热处理后复合材料的强度和伸长率均有显著提高。

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.