Martensitic transformation induced in Ti15V7Al alloy at low and high temperatures+1

Yoshito Takemoto, Miyu Tsunekawa, Yuji Manabe, Soushi Itano, Yuji Muraoka

Research output: Contribution to journalArticle

Abstract

Ti15V7Alalloy, which has a composition exhibiting peculiar phenomena upon tempering, was prepared and its martensitic transformation behavior during cooling and heating was investigated. The structure of the quenched specimen mostly consisted of the β-phase and a small quantity of AA martensite near the grain boundaries. When heating an elastically bent strip of the specimen, spontaneous bending occurred, as reported for some other alloys. Subzero treatment using LN2 newly induced some martensites around the prior martensites formed by quenching, but no martensites were formed in the single ° region. The formation of the martensites by the subzero treatment exhibited time dependence. Even tempering at 550°C for 3 s, induced the formation of coarse martensites throughout the specimen. All martensites formed by the quenching, the subzero treatment or the tempering disappeared completely upon heat treatment at 200°C for 300 s, resulting in a single °-phase. However, the coarse martensites were regenerated from the single °-phase by tempering at 550°C for a short time, which means that the martensite behavior in the range of 200550°C is reversible. Continuous isothermal aging at 550°C led to marked hardening through the process β→coarse fine α →β + fine α. Both an MS curve and a free-energy model, which can explain the martensite formation at low and high temperatures and the annihilation at 200°C, are proposed.

Original languageEnglish
Pages (from-to)1560-1566
Number of pages7
JournalMaterials Transactions
Volume59
Issue number10
DOIs
Publication statusPublished - Jan 1 2018

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Martensitic transformations
martensitic transformation
martensite
Martensite
tempering
Tempering
Temperature
Quenching
quenching
Heating
heating
hardening
Free energy
time dependence
Hardening
strip
Grain boundaries
heat treatment
grain boundaries
Aging of materials

Keywords

  • Electrical resistivity
  • Inverse transformation
  • MS temperature
  • Spinodal decomposition
  • Sub-zero treatment
  • Tempering
  • α-martensite

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Martensitic transformation induced in Ti15V7Al alloy at low and high temperatures+1. / Takemoto, Yoshito; Tsunekawa, Miyu; Manabe, Yuji; Itano, Soushi; Muraoka, Yuji.

In: Materials Transactions, Vol. 59, No. 10, 01.01.2018, p. 1560-1566.

Research output: Contribution to journalArticle

Takemoto, Yoshito ; Tsunekawa, Miyu ; Manabe, Yuji ; Itano, Soushi ; Muraoka, Yuji. / Martensitic transformation induced in Ti15V7Al alloy at low and high temperatures+1. In: Materials Transactions. 2018 ; Vol. 59, No. 10. pp. 1560-1566.
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