Superelastic response of low-modulus porous beta-type Ti-35Nb-2Ta-3Zr alloy fabricated by laser powder bed fusion

Noman Hafeez, Jia Liu, Liqiang Wang, Daixiu Wei, Yujin Tang, Weijie Lu, Lai Chang Zhang

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    This work investigated the superelastic response of the low-modulus porous β type Ti-35Nb-2Ta-3Zr scaffolds with different pore dimensions fabricated by laser powder bed fusion. The superelastic behavior was enhanced with increasing the pore size and stress-induced phase transformation, which correspondingly led to stress-induced α" [110]-type I twin martensitic transformation and ω formation adjacent to β matrix/twins. The resultant interstitial compound phase structure facilitated the β → α" and β → ω transition, which was triggered by interfacial stress/strain concentration and high-density dislocations. Substantial high-angle grain boundaries (HAGBs) accumulated high-intensity Schimd factor and crystallographic texture after being deformed. Moreover, a lower Young's modulus was obtained when the pore size and stress increased.

    Original languageEnglish
    Article number101264
    JournalAdditive Manufacturing
    Volume34
    DOIs
    Publication statusPublished - 2020 Aug

    Keywords

    • Laser powder bed fusion
    • Superelastic properties
    • Young's modulus
    • α Twin martensite

    ASJC Scopus subject areas

    • Biomedical Engineering
    • Materials Science(all)
    • Engineering (miscellaneous)
    • Industrial and Manufacturing Engineering

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