Effects of quenching process on microstructure, mechanical properties and magnetic susceptibility in Zr[sbnd]1Mo alloy fabricated by powder bed fusion process

Xiaohao Sun, Debao Liu, Weiwei Zhou, Naoyuki Nomura, Hisashi Doi, Yusuke Tsutsumi, Takao Hanawa

Research output: Contribution to journalArticle

Abstract

In order to depress the “susceptibility artifacts” in magnetic resonance imaging (MRI), improve the mechanical reliability for biomedical structural applications and realize tailor-made medical devices with complex shape, low magnetic Zr-1Mo(wt%) alloy builds with high relative density (c.a. 99.9%) fabricated by laser powder bed fusion process(L-PBF) were subjected to various heat treatment conditions followed by water quenching. After quenching process acicular α′ microsturcture in as-build Zr-1Mo(wt%) alloy builds changed to basket weave α + β structure, unique retained α + ultra fine (α′ + α″) martensite structure or retained α + acicular α′ microsturcture depending on quenching conditions. X-ray diffraction (XRD) and high resolution-transmission electron microscope(HR-TEM) revealed a unique retained α + ultra fine (α′ + α″) martensite microstructure in 1123 K specimens. The stress-induced competition between β to α′ transformation and β to α″ transformation contributed to this unique microstructure. This unique microstructure contributed to a good balance between strength (UTS:822 MPa) and ductility (Elongation:11.7%). The volume magnetic susceptibility of quenched Zr-1Mo(wt%) alloy builds maintained low(about 1.01 × 10−4) indicating good MRI compatibility. The magnetic susceptibility of each phase was modified to be χα″ > χβ > χα > χα > χω. Zr-1Mo(wt%) alloy quenched from 1123 K will be an promising candidates for tailor made devices under MRI environments.

Original languageEnglish
Article number108356
JournalMaterials and Design
Volume187
DOIs
Publication statusPublished - 2020 Feb

Keywords

  • Magnetic resonance imaging compatibility
  • Microstructure
  • Powder bed fusion process
  • Quenching process
  • Zr-based alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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