Effects of Al Addition on the Microstructure and Creep Properties of TiZrNbTaMo-Based Refractory High-Entropy Alloys AITranslate

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Chinese Library Classification Number:TG132.32[一般工业技术—材料科学与工程]

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The creep behavior of refractory high-entropy alloys(RHEAs)during service significantly limits their engineering applications.To address this issue,the effects of varying Al content on the microstructure and creep properties of(Ti_39.5Zr_39.5Nb_9.7Ta_4.3Mo₇)_100-xAl_x(x=0,5,10,15,20,molar fraction,%)RHEAs were investigated.The results indicate that the alloy exhibits a single BCC phase at low Al content,while B2 and Al₃Zr phases precipitate at high Al content,with partial solid solution of Al into the BCC matrix causing lattice contraction.The Al addition enhances nanohardness of the alloy,and the nanohardness of the alloy with 20%Al addition reaches 6.85 GPa under a peak load of 50 mN.Furthermore,Al addition reduces the total creep displacement of the alloy.The alloy with higher Al content exhibits a lower strain rate sensitivity exponent and superior creep resistance.This study provides a theoretical basis for optimizing the composition and enhancing the creep properties of refractory high-entropy alloys.