| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Non-metallic Si Element on the Microstructure and Mechanical Properties of AlNbTiMoHfSi Refractory High-Entropy Alloy |
| HUANG Rui1,2, WANG Mingliang1,2, ZHAO Jiaxuan1,2, LU Yiping1,2,*
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1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
2 High-Entropy Alloys Materials Engineering Research Center (Liaoning Province) Dalian 116024, Liaoning, China |
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Abstract Refractory high-entropy alloys (RHEAs) are recognized as the next-generation high-performance structural materials owing to their exceptional strength retention over a wide temperature range. In addition, industrial applications can be extended due to their good room-temperature plasticity. However, the strength of the RHEAs with good room-temperature plasticity is limited at 800 ℃ or higher temperatures. Improving the high-temperature strength of these kinds of RHEAs is an urgent need in this filed. In this study, it was found that adding trace amounts of non-metallic Si elements can improve the high-temperature strength of RHEAs while maintaining good tensile plasticity. Specifically, using Al5Nb36Ti41Mo5Hf13 as the model alloy, a series of RHEAs with the composition (Al5Nb36Ti41Mo5Hf13)100-xSix (x=0.1%, 0.2%, 0.3%, named as Mo5Si0.1,Mo5Si0.2 and Mo5Si0.3) were obtained by adjusting the Si content. The effects of Si addition on microstructure, hardness, room-temperature tensile properties, and high-temperature strength were investigated systematically. It was found that the addition of trace amounts of Si did not lead to the formation of secondary phases, and the alloys retained a single-phase structure. Increasing the Si content not only enhanced the hardness but also both the room- and high-temperatures strength of alloys. In the range of 600—800 ℃, the high-temperature strength increased with increasing Si content. Among the studied alloys, the Mo5Si0.3 alloy exhibited the best high-temperature mechanical pro-perties. The true compressive strength of the Mo5Si0.3 alloy at 600 ℃, 700 ℃, and 800 ℃ were 930 MPa, 809 MPa, and 599 MPa, respectively, which were 1.4, 1.4, and 1.5 times higher than those of the Al5Nb36Ti41Mo5Hf13 alloy counterpart. This work provides new insights for designing RHEAs with excellent high-temperature properties.
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Published: 10 March 2026
Online: 2026-03-10
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2026, Vol. 40 
