Exceptionally high strain-hardening and ductility due to transformation induced plasticity effect in Ti-rich high-entropy alloys

Abstract Ti-rich body-centered cubic (BCC, β ) high-entropy alloys having compositions Ti 35 Zr 27.5 Hf 27.5 Nb 5 Ta 5 , Ti 38 Zr 25 Hf 25 Ta 10 Sn 2 , and Ti 38 Zr 25 Hf 25 Ta 7 Sn 5 (in at%) were designed using bond order (Bo)-mean d -orbital energy level (Md) approach. Deformation mechanisms of t...

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Bibliographic Details
Published in:Scientific reports 2020-08, Vol.10 (1), p.13293-13293, Article 13293
Main Authors: Eleti, Rajeshwar R., Klimova, Margarita, Tikhonovsky, Mikhail, Stepanov, Nikita, Zherebtsov, Sergey
Format: Article
Language:English
Subjects:
Alloys
Ductility
Genetic transformation
Plasticity
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Summary:Abstract Ti-rich body-centered cubic (BCC, β ) high-entropy alloys having compositions Ti 35 Zr 27.5 Hf 27.5 Nb 5 Ta 5 , Ti 38 Zr 25 Hf 25 Ta 10 Sn 2 , and Ti 38 Zr 25 Hf 25 Ta 7 Sn 5 (in at%) were designed using bond order (Bo)-mean d -orbital energy level (Md) approach. Deformation mechanisms of these alloys were studied using tensile deformation. The alloys showed exceptionally high strain-hardening and ductility. For instance, the alloys showed at least twofold increment of tensile strength compared to the yield strength, due to strain-hardening. Post-deformation microstructural observations confirmed the transformation of β to hexagonal close packed (HCP, α ′) martensite. Based on microstructural investigation, stress–strain behaviors were explained using transformation induced plasticity effect. Crystallographic analysis indicated transformation of β to α ′ showed strong variant selection (1 1 0) β //(0 0 0 1) α ′ , and [1 − 1 1] β //[1 1 − 2 0] α ′ .
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-70298-2