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Tensile creep properties of a Si-doped VNbTiTa refractory high-entropy alloy

delete2026-05-23
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PRE
AI
L
Li, H. Y.
马兆龙 cover
马兆龙 (Zhaolong Ma)
W
Wu, C. K.
Y
Ye Jiang
C
Cheng, X. W. *
DOI：10.1016/j.scriptamat.2026.117338delete
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Abstract

Abstract

En 中文
The tensile creep behavior of a (VNbTiTa)(99)Si-1 refractory high-entropy alloy (RHEA) strengthened by nano-silicides was investigated at 1173-1273 K. A distinct inverse primary creep is observed, and microstructural analysis reveals viscous glide as the dominant mechanism, synergistically augmented by dispersed silicides. This yields an apparent stress exponent of similar to 5.5 and an activation energy of similar to 438 kJ/mol-values that reflect pronounced second-phase strengthening. Notably, dynamic alpha-Ti precipitation at 1173 K/100 MPa further enhances creep resistance. These findings demonstrate that tailoring second-phase precipitation within a BCC solid-solution matrix is an effective strategy for developing creep-resistant RHEAs.
Keywords:
Inverse primary creep
Refractory high-entropy alloy
Silicides
Deformation mechanism
Dislocation

Journal

Scripta Materialia cover
Scripta Materialia
IF:
5.6
Papers:
1.6W
Citations:
5.1W

Organization

B
beijing institute of technology
Scholars:
5.3W
Papers: 3.9W
Citations: 63
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