0.5Nb1.5TiV2Zr0.5;高熵合金;微觀組織;硬度;壓縮性能"/> 0.5Nb1.5TiV2Zr0.5高熵合金，并研究了其微觀組織、密度及力學性能。結果表明，Al0.5Nb1.5TiV2Zr0.5合金由為90.6%（體積分數(shù)）的體心立方相和9.4%（體積分數(shù)）的C14-Laves第二相組成。合金基體相富含Ti和V，第二相富含Al和Zr。合金的密度為6284 kg/m3，維氏硬度為5197.9 MPa。合金的屈服強度隨溫度升高而降低，由室溫下1082.9 MPa降低到1073 K下的645.0 MPa。壓縮應變由室溫下的27.20%降低到873 K下的14.94%，這與合金中原子間的相互作用力隨溫度升高而降低有關。在1073 K時合金應變超過50%，表現(xiàn)出良好的塑性而未發(fā)生斷裂。壓縮測試結果表明，合金韌脆轉變溫度在873~1073 K之間。"/>

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Al0.5Nb1.5TiV2Zr0.5 難熔高熵合金組織和力學性能
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1.哈爾濱理工大學 材料科學與化學工程學院，黑龍江 哈爾濱 150040;2.衢州學院 浙江省空氣動力裝備技術重點實驗室，浙江 衢州 324000

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基金項目:

NSFC (No. 52171113)


Microstructure and Mechanical Properties of Al0.5Nb1.5TiV2-Zr0.5 Refractory High Entropy Alloy
Author:
Affiliation:

1.School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China;2.Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province, Quzhou University, Quzhou 324000, China

Fund Project:

National Natural Science Foundation of China (52171113)

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    摘要:

    采用真空電弧熔煉制備了Al0.5Nb1.5TiV2Zr0.5高熵合金，并研究了其微觀組織、密度及力學性能。結果表明，Al0.5Nb1.5TiV2Zr0.5合金由為90.6%（體積分數(shù)）的體心立方相和9.4%（體積分數(shù)）的C14-Laves第二相組成。合金基體相富含Ti和V，第二相富含Al和Zr。合金的密度為6284 kg/m3，維氏硬度為5197.9 MPa。合金的屈服強度隨溫度升高而降低，由室溫下1082.9 MPa降低到1073 K下的645.0 MPa。壓縮應變由室溫下的27.20%降低到873 K下的14.94%，這與合金中原子間的相互作用力隨溫度升高而降低有關。在1073 K時合金應變超過50%，表現(xiàn)出良好的塑性而未發(fā)生斷裂。壓縮測試結果表明，合金韌脆轉變溫度在873~1073 K之間。

    Abstract:

    The Al0.5Nb1.5TiV2Zr0.5 high entropy alloy was prepared by vacuum arc melting, and its microstructure, density, and mechanical properties were investigated. Results show that Al0.5Nb1.5TiV2Zr0.5 alloy consists of 90.6vol% body-centered cubic phase and 9.4vol% C14-Laves secondary phase. The matrix phase of the alloy is rich in Ti and V, and the secondary phase is rich in Al and Zr. The alloy has a low density of 6284 kg/m3 and Vickers hardness of 5197.9 MPa. The yield strength of alloy is decreased with increasing the temperature: it decreases from 1082.9 MPa at room temperature to 645.0 MPa at 1073 K. The compressive strain decreases from 27.20% at room temperature to 14.94% at 873 K, which is related to the decrease in atomic interaction force when the temperature rises. At 1073 K, the compressive strain of alloy exceeds 50%, indicating the good plasticity without fracture. The results of compression tests show that the ductile-brittle transition temperature ranges from 873 K to 1073 K.

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蔣文韜,王曄,姜博,王曉紅,馬騰飛,朱冬冬.Al0.5Nb1.5TiV2Zr0.5 難熔高熵合金組織和力學性能[J].稀有金屬材料與工程,2023,52(3):846~851.[Jiang Wentao, Wang Ye, Jiang Bo, Wang Xiaohong, Ma Tengfei, Zhu Dongdong. Microstructure and Mechanical Properties of Al0.5Nb1.5TiV2-Zr0.5 Refractory High Entropy Alloy[J]. Rare Metal Materials and Engineering,2023,52(3):846~851.]
DOI：10.12442/j. issn.1002-185X.20220429

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  • 收稿日期:2022-05-16
  • 最后修改日期:2022-11-23
  • 錄用日期:2022-11-24
  • 在線發(fā)布日期: 2023-03-31
  • 出版日期: 2023-03-24