Tailored rapid annealing to obtain heterostructured ultra-high-strength lightweight Ti-rich medium-entropy alloys

Liao, Y.C.; Chen, P.S.; Tsai, P.H.; Jang, Jae-il; Hsieh, Ker-Chang; Chen, C.Y.; Huang, J.C.; Wu, Hongjian; Tsao, I-Yu

doi:10.1016/j.rinma.2022.100342

Cited by 2 publications

(1 citation statement)

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“…Afterwards, the quinary Ti-rich MEAs with vanadium addition were proposed [ 23 , 24 ]. Moreover, the effect of thermo-mechanical treatment on Ti-rich MEAs were also investigated [ 25 , 26 ]. In this study, we fine-tuned the composition of a previously developed ductile Ti 65 (AlCrNbV) 35 alloy [ 23 , 27 ] by microalloying it with small amounts of Ni (characterized by a smaller radius) through solid solution strengthening to produce a series of MEAs with enhanced mechanical properties.…”

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confidence: 99%

Enhancing the Strength and Ductility Synergy of Lightweight Ti-Rich Medium-Entropy Alloys through Ni Microalloying

Chen,

Liu,

Tsai

et al. 2024

Materials

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Medium-entropy alloys (MEAs) have attracted considerable attention in recent decades due to their exceptional material properties and design flexibility. In this study, lightweight and non-equiatomic MEAs with low density (~5 g/cm3), high strength (yield strength: 1200 MPa), and high ductility (plastic deformation: ≧10%) were explored. We fine-tuned a previously developed Ti-rich MEA by microalloying it with small amounts of Ni (reducing the atomic radius and increasing the elastic modulus) through solid solution strengthening to achieve a series of MEAs with enhanced mechanical properties. Among the prepared MEAs, Ti65Ni1 and Ti65Ni3 exhibited optimal properties in terms of the balance between strength and ductility. Furthermore, the Ti65Ni3 MEA was subjected to thermo-mechanical treatment (TMT) followed by cold rolling 70% (CR70) and cold rolling 85% (CR85). Subsequently, the processed samples were rapidly annealed at 743 °C, 770 °C, 817 °C, and 889 °C at a heating rate of 15 °C/s. X-ray diffraction analysis revealed that the MEA could retain its single-body-centered cubic solid solution structure after TMT. Additionally, the tensile testing results revealed that increasing the annealing temperature led to a decrease in yield strength and an increase in ductility. Notably, the Ti65Ni3 MEA sample that was subjected to CR70 and CR85 processing and annealed for 30 s exhibited high yield strength (>1250 MPa) and ductility (>13%). In particular, the Ti65Ni3 MEA subjected to CR85 exhibited a specific yield strength of 264 MPa·cm3/g, specific tensile strength of 300 MPa·cm3/g, and ductility of >13%.

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