Phase transformations in body-centered cubic NbxHfZrTi high-entropy alloys
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China)
Highlights: • BCC phase stability and phase transformations of NbxHfZrTi HEAs were investigated. • Three types of phase transformations: β → ω, β → α″ and β → α′ in HEAs were observed. • The athermal ω phase in Nb{sub 0.2}HfZrTi HEA leads to a much higher yield strength. • The reversible β → α″ in Nb{sub 0.4}HfZrTi HEA results in a narrow cyclic hysteresis loop. • A sluggish effect of martensitic transformations in complex HEAs is revealed. - Abstract: The stability of body-centered cubic (β) phases and phase transformations of NbxHfZrTi (x = 1, 0.6, 0.4 and 0.2) high-entropy alloys (HEAs) were investigated. Three types of transformations were observed: the β → ω transformation during cooling in Nb0.2 HEA, the deformation-induced β → α″ and β → α′ transformations in Nb0.4 and Nb0.2 HEAs, respectively. This implies that the phonon anomalies, T{sub 1}1/2(110) and L2/3(111), as the origins of phase transformations in simple Ti, Zr and Hf alloys, also exist in composition-complex TiZrHf-based HEAs. However, the very small fraction of deformation-induced α′/α″ martensite in fractured Nb0.4 and Nb0.2 suggests a sluggish effect of transformation as compared with simple β-Ti alloys.
- OSTI ID:
- 22805105
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 142; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructures and phase transformations of Ti-30Zr-xNb (x = 5, 7, 9, 13 at.%) shape memory alloys
Influence of Sn on Martensitic Beta Ti Alloys