Age-induced precipitation and hardening behavior of Ni3Al intermetallic alloys containing vanadium

Satoshi Semboshi, Ryosuke Sasaki, Yasuyuki Kaneno, Takayuki Takasugi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

L12-type Ni3Al alloys containing vanadium are potential candidates for solid-solution and age-hardenable alloy systems, according to the Ni3Al-Ni3V pseudo-binary phase diagram. Therefore, herein, variations in the microstructure and mechanical properties of Ni-13 at.% Al-12 at.% V-50 ppm B alloy during isothermal aging were investigated. Alloy specimens were solution-treated at 1323 K for 48 h, quenched in water, and aged at 1073 K to 1173 K. The quenched specimens exhibited a single phase of Ni3Al (L12 structure derived from Al (fcc) structure), while in the aged specimens, numerous fine disk-shaped precipitates identified as Ni3V (D022 structure from orthorhombic structure) were formed on {001} planes of the Ni3Al matrix. The size of the disk-shaped Ni3 V precipitates increased gradually with increasing aging period. The hardness and strength of the specimens increased initially during aging at 1073 K to 1173 K, reached a maximum, followed by a subsequent decrease. The age-hardening behavior observed for the specimens can be explained in terms of precipitation of the fine disk-shaped Ni3 V precipitates in the Ni3 Al matrix. Furthermore, the peak-aged specimens exhibited an increase in yield strength with increasing testing temperature, similar to other L12-type intermetallic alloys.

Original languageEnglish
Article number160
JournalMetals
Volume9
Issue number2
DOIs
Publication statusPublished - 2019

Keywords

  • Aging
  • Microstructure
  • NiAl
  • Precipitation
  • Strength
  • Vanadium

ASJC Scopus subject areas

  • Materials Science(all)

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