定向能沉积法提高（Ti2AlC和TiB2）增强TiAl合金的强度和塑性

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-07-19 DOI:10.1016/j.jallcom.2025.182367

Hangyu Yue, Hongwu Gao, Chenhao Zhang, Yunlou Wang, Rengeng Li

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引用次数: 0

摘要

采用TiAl和B4C粉末定向能沉积法制备了原位合成（Ti2AlC和TiB2）杂化增强Ti-48Al-2Cr-2Nb合金。研究了（Ti2AlC和TiB2）/Ti-48Al-2Cr-2Nb合金的显微组织表征、界面结构和高温力学性能。结果表明：B4C的加入细化了组织，B4C与TiAl基体原位反应形成TiB2和Ti2AlC相；TiB2呈弯曲针状，在基体内随机分布。Ti2AlC在（α2/γ）片层界面沿纳米尺度呈椭球状分布。用第一性原理计算从电子学角度分析了Ti2AlC/TiAl和TiB2/TiAl的界面性质。结果表明，Ti2AlC和TiB2相与γ基体具有较强的结合强度。在750 ~ 850℃的温度范围内，T4822合金中掺入B₄C均能提高合金的断裂伸长率和拉伸强度。最后，详细分析了T4822-B4C合金凝固过程中的组织演变。

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Enhanced strength and ductility of (Ti2AlC and TiB2) -reinforced TiAl alloy fabricated by directed energy deposition

In-situ synthesize (Ti₂AlC and TiB₂) hybrid- reinforced Ti-48Al-2Cr-2Nb alloys was fabricated by directed energy deposition of TiAl and B₄C powders. Microstructure characterization, interfacial structures and elevated temperature mechanical properties of (Ti₂AlC and TiB₂)/Ti-48Al-2Cr-2Nb alloys was investigated. The results indicated that the microstructure was refined by B₄C addition, and TiB₂ and Ti₂AlC phases were formed by in-situ reaction between B₄C and TiAl matrix. TiB₂ exhibited curved needle-shaped and distributed within the matrix randomly. Ellipsoidal-shaped Ti₂AlC precipitates were distributed along the (α₂/γ) lamellar interface with the nanoscale size. Ti₂AlC/TiAl and TiB₂/TiAl interface properties were analyzed from an electronic perspective by first-principles calculations. It was found that Ti₂AlC and TiB₂ precipitates had strong bonding strength with the γ matrix. Both the UTS and fracture elongation were enhanced by B₄C incorporation of the T4822 alloy at the temperature range of 750-850℃. Finally, the microstructural evolution during the solidification of T4822-B₄C alloy was analyzed in detail.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.