Understanding the tensile ductility of a novel low-activation BCC high-entropy alloy deformed at intermediate temperature

Low-activation body-centered cubic (BCC) high-entropy alloys (HEAs) often possess poor tensile ductility. Here we report a novel low-activation VCrFeMn0.33 BCC HEA that exhibits good tensile ductility at 650 °C and above. However, it shows poor tensile ductility at 500 °C and below, indicating that...

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Veröffentlicht in:Scripta materialia 2024-11, Vol.252, p.116269, Article 116269
Hauptverfasser: Jiang, H., He, B.B., Huang, M.X.
Format: Artikel
Sprache:eng
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Zusammenfassung:Low-activation body-centered cubic (BCC) high-entropy alloys (HEAs) often possess poor tensile ductility. Here we report a novel low-activation VCrFeMn0.33 BCC HEA that exhibits good tensile ductility at 650 °C and above. However, it shows poor tensile ductility at 500 °C and below, indicating that the ductile-to-brittle transition temperature (DBTT) of the current HEA falls between 500 °C and 650 °C. At temperatures above DBTT, the current BCC HEA deforms via dislocation glide, similar to the tensile deformation observed in conventional ductile BCC alloys, which is rarely reported for non-refractory BCC HEAs. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2024.116269