Influences of environment in heat treatment and pre-aging at room temperature on age-hardening of Ti-Mo alloys

Moritaka Hida, Eiichi Sukedai, Yoshito Takemoto

Research output: Contribution to journalArticle

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Abstract

The influences of environment in solute heat treatment and aging and pre-aging at room temperature on the age hardening behavior of Ti-14 and 20 mass% Mo alloys at 623 K were studied by Vickers hardness measurements. The solution heat treatments were performed in vacuums of 1.3 mPa and 8 Pa. The atmosphere, a pure argon current and a vacuum were the environments. The periods of pre-aging were 1.6 × 105 s for the short pre-aging and 1.0 × 106-3.7 × 107 s for the long one. The specimens which were solution heat treated in each vacuum and pre-aged for 1.6 × 105 s showed two-stage hardening. The first stage seemed to be due to a product formed by the reaction of quenched-in vacancies, interstitial atoms and metallic atoms. The second stage was due to the formation of an aged omega phase. The age hardening behavior of the specimen pre-aged for a short period was more active than that of the specimen pre-aged for a long period in spite of solution heat treatment in either vacuum. The role of quenched-in vacancies was important in Ti-20 mass% Mo alloys in connection with pre-aging at room temperature. The higher the oxygen content in the environments during aging, the greater the hardness of the surface layer and interior of Ti-14 mass% Mo alloys.

Original languageEnglish
Pages (from-to)102-106
Number of pages5
JournalMaterials Transactions
Volume30
Issue number2
Publication statusPublished - Feb 1989
Externally publishedYes

Fingerprint

precipitation hardening
Age hardening
heat treatment
Aging of materials
Heat treatment
room temperature
Vacuum
vacuum
Temperature
Vacancies
Atoms
Vickers hardness
Argon
hardening
atoms
Hardening
surface layers
solutes
interstitials
hardness

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Influences of environment in heat treatment and pre-aging at room temperature on age-hardening of Ti-Mo alloys. / Hida, Moritaka; Sukedai, Eiichi; Takemoto, Yoshito.

In: Materials Transactions, Vol. 30, No. 2, 02.1989, p. 102-106.

Research output: Contribution to journalArticle

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