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

Y. C. Liao, P. S. Chen, P. H. Tsai, J. S.C. Jang, K. C. Hsieh, C. Y. Chen, J. C. Huang, H. J. Wu, I. Y. Tsao

Research output: Contribution to journalArticlepeer-review

Abstract

Thermomechanical treatment (TMT) is a widely used process for effectively enhancing the mechanical properties of conventional metallic materials. This study applied TMT along with rapid annealing to a lightweight (≈5 g/cm3) Ti-rich Ti65(AlCrNb)35 medium-entropy alloy (Ti-65 MEA) to equip it with a heterogeneous structure (heterostructure). After the annealing treatment, the Ti-65 MEA exhibited a heterogenous microstructure comprising nonrecrystallized shear bands and ultrafine recrystallized grains. Remarkably, the heterostructured Ti-65 MEA had extraordinary mechanical properties (tensile strength, 1500 MPa; elongation, 25%) and ultrahigh specific strength (247 MPa cm3/g).

Original languageEnglish
Article number100342
JournalResults in Materials
Volume16
DOIs
StatePublished - Dec 2022

Keywords

  • Crystal structure
  • Metals and alloys
  • Microstructure

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