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Formation of coherent BCC/B2 microstructure and mechanical properties of Al–Ti–Zr–Nb–Ta–Cr/Mo light-weight refractory high-entropy alloys

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Abstract

The present work investigated the formation of coherent body-centered-cubic (BCC)/B2 microstructure in Al–Ti–Zr–Nb–Ta–Cr/Mo refractory high-entropy alloy system, in which three alloys with the composition of Al2Ti6Zr2Nb3Ta2(Cr/Mo)1 were designed. These as-cast alloy ingots were homogenized at 1573 K for 2 h and then aged at different temperatures for 24 h. It is found that the BCC/B2 coherent microstructure with cuboidal BCC nanoprecipitates into the B2 matrix would be formed in 873 K-aged Al2Ti6Zr2Nb3Ta2Cr0.5Mo0.5 alloy with half Cr and half Mo, which is ascribed to a moderate lattice misfit (ε = 0.94%) between BCC and B2 phases. It is due to the special coherent microstructure that results in a prominent mechanical property with the highest compressive yield strength (σYS = 1314 MPa) and good plasticity among these alloys, while coarse Cr2Ti and Zr5Al3 particles are existed in 873 K-aged alloy with Cr1. After 1073 K aging, all these alloys with Cr1, Cr0.5Mo0.5 and Mo1 consist of BCC, B2 and Zr5Al3, in which BCC/B2 coherent microstructure is destabilized. The strengthening mechanism of BCC/B2 coherent microstructure in 873 K-aged alloy with Cr0.5Mo0.5 was also discussed.

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摘要

本工作研究了Al-Ti-Zr-Nb-Ta-Cr/Mo系列难熔高熵合金中BCC/B2共格组织的形成, 其中, 设计了三个Al2Ti6Zr2Nb3Ta2(Cr/Mo)1合金成分。合金铸锭在经过1573 K/2 h均匀化处理之后在不同温度下进行24 h的时效处理。研究发现, 等比例Cr/Mo添加的Al2Ti6Zr2Nb3Ta2Cr0.5Mo0.5合金经过873 K时效之后获得了立方形BCC纳米粒子析出的BCC/B2共格组织, 这要归因于BCC和B2两相之间的适中的点阵错配 (ε = 0.94%)。正是得益于这种特殊的共格组织, 该合金具有优异的力学性能, 其具有最高的压缩屈服 (σYS = 1314 MPa) 以及良好的压缩塑性。然而Cr1合金在经过873 K时效后却形成了粗大的Cr2Ti和Zr5Al3相。并且由于BCC/B2共格组织的不稳定, 经过1073 K 时效之后, 这些合金由BCC, B2和Zr5Al3三相组成。此外详细讨论了873 K时效后的Cr0.5Mo0.5合金中的BCC/B2共格组织的强化机制。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 52171152) and the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation (No. 2020JJ25CY004).

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Authors and Affiliations

  1. Engineering Research Center of High Entropy Alloy Materials (Liaoning Province), Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    Dong-Ming Jin, Zhen-Hua Wang, Ben Niu & Qing Wang

  2. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621908, China

    Jin-Feng Li

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  1. Dong-Ming Jin
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Jin, DM., Wang, ZH., Li, JF. et al. Formation of coherent BCC/B2 microstructure and mechanical properties of Al–Ti–Zr–Nb–Ta–Cr/Mo light-weight refractory high-entropy alloys. Rare Met. 41, 2886–2893 (2022). https://doi.org/10.1007/s12598-022-01971-w

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