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原位自生Ti2AlC增強TiAl合金組織與力學(xué)性能影響研究
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作者單位:

1.浙江工業(yè)大學(xué)機械工程學(xué)院;2.衢州學(xué)院浙江省空氣動力裝備技術(shù)重點實驗室

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基金項目:

國家自然科學(xué)基金(52171120,52271106,52071188)；浙江省自然科學(xué)基金(LZY23E050001)


Microstructure and mechanical properties of TiAl alloy reinforced by in-situ Ti2AlC
Author:
Affiliation:

1.School of Mechanical Engineering,Zhejiang University of Technology;2.Key Laboratory of Air-drien Equipment Technology of Zhejiang Province,Quzhou University

Fund Project:

The National Natural Science Foundation of China (52171120，52271106，52071188);Zhejiang Natural Science Foundation of China（LZY23E050001）

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    摘要:

    采用真空電弧熔煉爐制備了原位自生Ti2AlC增強Ti-48Al-2Cr-2Nb合金,研究了CNTs含量對TiAl基合金的組織演變和力學(xué)性能的影響。結(jié)果表明,隨著CNTs的增加,合金的凝固路徑向高Al方向移動,γ相含量增多,與此同時片層組織逐漸細化,Ti2AlC的長徑比逐漸減小。在固溶強化、細晶強化以及Ti2AlC析出相強化的作用下,合金的力學(xué)性能得到顯著提高。隨著CNTs含量的增加,合金的維氏硬度由358.4±19.2 HV提高到了428.5±23.1 HV。合金的室溫壓縮強度和高溫壓縮強度均隨著CNTs的增加先增加后減小。當(dāng)CNTs添加量為3.0 at.%時,其室溫壓縮強度和最大應(yīng)變分別達到1890.61 MPa和29.09%,分別提升54.95%和28.31%。在800 ℃壓縮中,合金的硬化和軟化效果受CNTs含量影響,3.0 at.% CNTs的合金表現(xiàn)出最高的壓縮強度,相比于未添加CNTs時提升約31.42%,而4.5 at.% CNTs的合金在不影響壓縮強度的情況下表現(xiàn)出較好的軟化效果。

    Abstract:

    Ti-48Al-2Cr-2Nb alloy reinforced by in-situ Ti2AlC was prepared by vacuum arc melting. The effect of CNTs content on the microstructure evolution and mechanical properties of TiAl alloy was investigated. The results show that with the increase of CNTs, the solidification path of the alloy moves to the direction of high Al and the volume fraction of γ phase increases. Meanwhile, the lamellar structure is gradually refined, and the length-diameter ratio of Ti2AlC gradually decreases. The mechanical properties of the alloy incresase significantly under the action of solid solution strengthening, grain refinement strengthening and Ti2AlC precipitated phase strengthening. With the increase of CNTs content, the Vickers hardness of the alloy increases from 358.4±19.2 HV to 428.5±23.1 HV. The compressive strength at room temperature and high temperature of the alloy first increases and then decreases with the increase of CNTs. When the addition of CNTs is 3.0 at.%, the compressive strength and maximum strain at room temperature reach 1890.61 MPa and 29.09%, respectively, which increase by 54.95% and 28.31%, respectively. At 800 ℃, the hardening and softening effects of the alloy are affected by the CNTs content. The alloy with 3.0 at. % CNTs shows the highest compressive strength, increasing by about 31.42% compared with without CNTs addition, and the alloy with 4.5 at. % CNTs shows better softening effect without sacrificing the compressive strength.

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引用本文

唐傅浩,朱冬冬,王曉紅,馬騰飛,董多.原位自生Ti2AlC增強TiAl合金組織與力學(xué)性能影響研究[J].稀有金屬材料與工程,2024,53(7):1917~1927.[Tang Fuhao, Zhu Dongdong, Wang Xiaohong, Ma Tengfei, Dong Duo. Microstructure and mechanical properties of TiAl alloy reinforced by in-situ Ti2AlC[J]. Rare Metal Materials and Engineering,2024,53(7):1917~1927.]
DOI：10.12442/j. issn.1002-185X.20230339

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  • 收稿日期:2023-06-01
  • 最后修改日期:2023-09-12
  • 錄用日期:2023-09-14
  • 在線發(fā)布日期: 2024-07-22
  • 出版日期: 2024-07-12