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

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2 Scopus citations

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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