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Metals 2019, 9(2), 160;

Age-Induced Precipitation and Hardening Behavior of Ni3Al Intermetallic Alloys Containing Vanadium

Institute for Materials Research, Tohoku University; Katahira 2-1-1, Aoba-ku, Sendai, Miyagi 980-8577, Japan
Department of Materials Science, Osaka Prefecture University; Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
Author to whom correspondence should be addressed.
Received: 25 December 2018 / Revised: 26 January 2019 / Accepted: 30 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Intermetallic Alloys)
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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 Ni3V 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 Ni3V precipitates in the Ni3Al matrix. Furthermore, the peak-aged specimens exhibited an increase in yield strength with increasing testing temperature, similar to other L12-type intermetallic alloys. View Full-Text
Keywords: Ni3Al; vanadium; aging; microstructure; precipitation; strength Ni3Al; vanadium; aging; microstructure; precipitation; strength

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Semboshi, S.; Sasaki, R.; Kaneno, Y.; Takasugi, T. Age-Induced Precipitation and Hardening Behavior of Ni3Al Intermetallic Alloys Containing Vanadium. Metals 2019, 9, 160.

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