Deformation induced transformation of ω phase in aged Ti-14 mass%Mo alloy

Yoshito Takemoto, Moritaka Hida, Akira Sakakibara

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ti-14 mass%Mo alloys aged for 1 × 106 s at 623 K were deformed by means of a tensile test at 300, 523, 623 and 723 K in Ar atmosphere or of rolling at room temperature in order to investigate the brittle fracture mechanism related to the ω phase. These deformed specimens were observed by optical and transmission electron microscopy. Both deformed structures consisted of many band-like products. In the products, very few ω particles could be found. Instead, zones having a structure different from ω, β and α phases existed. It was found that these zones possessed a body centered triclinic structure, which was newly named β″ on account of the structural similarity to the β phase. The β″ was transformed from ω by deformation. In the transformation process to β″, one ω variant changed into two types of β″; one was closely related to the β matrix, and the other had a {112}〈111〉 twin relation to the former. It is suggested that the band products act as a path of crack propagation prior to the brittle fracture in the aged Ti-Mo alloy.

Original languageEnglish
Pages (from-to)780-787
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume59
Issue number8
DOIs
Publication statusPublished - Jan 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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