The influence of advanced hot isostatic pressing on phase transformations, mechanical properties of Ti-34Nb-13Ta-5Zr-0.2O alloy manufactured by In-situ alloying via selective laser melting

Weihuan Kong, Elisabeth M. Francis, Qi Shi, Sophie C. Cox, Feng Wang, Min Kuang, Moataz M. Attallah

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, advanced hot isostatic pressing (HIP) subjected to high and intermediate cooling rate (HCR & ICR) were exploited to close keyholes and tune the microstructure of SLMed Ti-34 Nb-13Ta-5Zr-0.2 O alloys (TNT5Zr-0.2 O, wt%). XRD analysis along with SEM and TEM micrographs reveal single beta phase in grain matrix of as-fabricated TNT5Zr-0.2 O (TNT5Zr-0.2 O-AF), TNT5Zr-0.2 O-HCR, TNT5Zr-0.2 O-ICR alloys. Additionally, high-angle annular dark-field (HAADF) micrographs show discrete large Ti-rich α grain boundary precipitates in TNT5Zr-0.2 O-ICR alloy. Tensile properties show that TNT5Zr-0.2 O-AF alloy possessed high UTS of 975 ± 12 MPa, and elongation of 4.9% ± 0.3%; the TNT5Zr-0.2 O-ICR alloy obtained slightly higher UTS (1036 ± 26 MPa) and lower elongation (3.0% ± 0.3%). S-N curves demonstrate fatigue limit of TNT5Zr-0.2 O-ICR alloy (150 MPa) is slightly higher than the counterpart of TNT5Zr-0.2 O-AF alloy (130 MPa), and slip-band cracking phenomenon was observed in both alloys. Advanced HIP subjected to intermediate cooling rate functions well to close SLM-processed keyholes but the resistance to fatigue is not markedly enhanced; the addition of proper amount oxygen interstitial solutes in TNTZ-O alloy is regarded as an inexpensive, effective strengthening technique for load-bearing biomedical applications.

Original languageEnglish
Article number163974
JournalJournal of Alloys and Compounds
Volume903
DOIs
Publication statusPublished - 15 May 2022

Bibliographical note

Funding Information:
Weihuan Kong acknowledges the support for the TEM characterization work provided by Centre for Electron Microscopy, University of Birmingham and Henry Royce Institute for Advanced Materials, funded through the UK's Engineering and Physical Sciences Research Council ( EPSRC ) grants EP/R00661X/1 , EP/S019367/1 , EP/P025021/1 and EP/P025498/1 .

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Fatigue properties
  • Hot isostatic pressing
  • Phase transformations
  • Selective laser melting
  • Strength-to-modulus ratio
  • β Ti alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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