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<p>In order to further enhance the high-temperature compression property of the AlNb<sub>2</sub>TiV refractory high-entropy alloy, the AlNb<sub>2</sub>TiVW<sub><i>x</i></sub> (<i>x</i> = 0.1, 0.3, 0.5) alloys have been newly designed. The microstructure and phase composition of these alloys were investigated, and the compression property tested. The results show that white dendrite segregation can be observed in the as-cast AlNb<sub>2</sub>TiVW<sub>0.1</sub> and AlNb<sub>2</sub>TiVW<sub>0.3</sub> alloys, and is caused by W enrichment. W addition does not change the BCC phase composition of as-cast alloys, but the 0.3-W and 0.5-W addition can reduce the lattice constant. The AlNb<sub>2</sub>TiVW<sub>0.3</sub> alloy yields the best compression property with compression strengths of 1482&#xa0;MPa, 1575&#xa0;MPa, and 1375&#xa0;MPa at 600°C, 700°C, and 800°C, respectively. Furthermore, at 200–600°C, under an initial compression stress of 500&#xa0;MPa, the stress–time curve of the AlNb<sub>2</sub>TiVW<sub>0.3</sub> alloy is more stable compared with the AlNb<sub>2</sub>TiV alloy. In the AlNb<sub>2</sub>TiV alloy, the HCP phase forms in the BCC phase matrix during high-temperature compression, and the two phases have the orientation relationship of &lt;110&gt;<sub>BCC</sub>//&lt;10-10&gt;<sub>HCP</sub> and &lt;111&gt;<sub>BCC</sub>//&lt;0001&gt;<sub>HCP</sub>. However, the AlNb<sub>2</sub>TiVW<sub>0.3</sub> alloy yields a good phase stability, which will be the reason for its good compression stability.</p>

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Enhanced High-Temperature Compression Property of TiAlNb2VW0.3 Refractory High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Shulin Dong,
  • Shibing Liu,
  • Yingdong Qu,
  • Ruirun Chen,
  • Guanglong Li,
  • Wei Zhang,
  • Qing Li,
  • Baihe Chen

摘要

In order to further enhance the high-temperature compression property of the AlNb2TiV refractory high-entropy alloy, the AlNb2TiVWx (x = 0.1, 0.3, 0.5) alloys have been newly designed. The microstructure and phase composition of these alloys were investigated, and the compression property tested. The results show that white dendrite segregation can be observed in the as-cast AlNb2TiVW0.1 and AlNb2TiVW0.3 alloys, and is caused by W enrichment. W addition does not change the BCC phase composition of as-cast alloys, but the 0.3-W and 0.5-W addition can reduce the lattice constant. The AlNb2TiVW0.3 alloy yields the best compression property with compression strengths of 1482 MPa, 1575 MPa, and 1375 MPa at 600°C, 700°C, and 800°C, respectively. Furthermore, at 200–600°C, under an initial compression stress of 500 MPa, the stress–time curve of the AlNb2TiVW0.3 alloy is more stable compared with the AlNb2TiV alloy. In the AlNb2TiV alloy, the HCP phase forms in the BCC phase matrix during high-temperature compression, and the two phases have the orientation relationship of <110>BCC//<10-10>HCP and <111>BCC//<0001>HCP. However, the AlNb2TiVW0.3 alloy yields a good phase stability, which will be the reason for its good compression stability.