Site-occupation behavior and solid-solution hardening effect of rhenium in Mo5SiB2

Junya Nakamura; Takahiro Kaneko; Takashi Hara; Kyosuke Yoshimi; Kouichi Maruyama; Hirokazu Katsui; Takashi Goto

doi:10.1016/j.intermet.2014.04.009

Site-occupation behavior and solid-solution hardening effect of rhenium in Mo₅SiB₂

Junya Nakamura, Takahiro Kaneko, Takashi Hara, Kyosuke Yoshimi, Kouichi Maruyama, Hirokazu Katsui, Takashi Goto

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The site-occupation behavior of Re in Mo₅SiB₂ (T ₂) was studied both theoretically and experimentally, and the effect of Re on the solid-solution hardening of T₂ was investigated by taking into account the off-stoichiometry of the T₂ phase. Mo-Si-B quaternary alloys containing 1.4 at.% Re were produced using a conventional Ar arc-melting technique, and the cast samples were homogenized at 1800 °C for 24 h in an Ar atmosphere. High-resolution high-angle annular dark-field scanning transmission electron microscopy observations strongly suggest that Re preferentially occupies the Mo sites in the Mo-B layers of the T₂ unit cell, which was confirmed by the site-occupation behavior predicted by first-principles calculations. Nanoindentation measurements indicate that the hardness of the T₂ phase is affected by both the off-stoichiometry and Re addition.

Original language	English
Pages (from-to)	85-91
Number of pages	7
Journal	Intermetallics
Volume	53
DOIs	https://doi.org/10.1016/j.intermet.2014.04.009
Publication status	Published - 2014 Oct

Keywords

A. Intermetallics
B. Solid-solution hardening
D. Site occupancy
E. Ab-initio calculations
F. Nanoindentation

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Site-occupation behavior and solid-solution hardening effect of rhenium in Mo5SiB2",

abstract = "The site-occupation behavior of Re in Mo5SiB2 (T 2) was studied both theoretically and experimentally, and the effect of Re on the solid-solution hardening of T2 was investigated by taking into account the off-stoichiometry of the T2 phase. Mo-Si-B quaternary alloys containing 1.4 at.% Re were produced using a conventional Ar arc-melting technique, and the cast samples were homogenized at 1800 °C for 24 h in an Ar atmosphere. High-resolution high-angle annular dark-field scanning transmission electron microscopy observations strongly suggest that Re preferentially occupies the Mo sites in the Mo-B layers of the T2 unit cell, which was confirmed by the site-occupation behavior predicted by first-principles calculations. Nanoindentation measurements indicate that the hardness of the T2 phase is affected by both the off-stoichiometry and Re addition.",

keywords = "A. Intermetallics, B. Solid-solution hardening, D. Site occupancy, E. Ab-initio calculations, F. Nanoindentation",

author = "Junya Nakamura and Takahiro Kaneko and Takashi Hara and Kyosuke Yoshimi and Kouichi Maruyama and Hirokazu Katsui and Takashi Goto",

year = "2014",

month = oct,

doi = "10.1016/j.intermet.2014.04.009",

language = "English",

volume = "53",

pages = "85--91",

journal = "Intermetallics",

issn = "0966-9795",

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AU - Nakamura, Junya

AU - Kaneko, Takahiro

AU - Hara, Takashi

AU - Yoshimi, Kyosuke

AU - Maruyama, Kouichi

AU - Katsui, Hirokazu

AU - Goto, Takashi

PY - 2014/10

Y1 - 2014/10

N2 - The site-occupation behavior of Re in Mo5SiB2 (T 2) was studied both theoretically and experimentally, and the effect of Re on the solid-solution hardening of T2 was investigated by taking into account the off-stoichiometry of the T2 phase. Mo-Si-B quaternary alloys containing 1.4 at.% Re were produced using a conventional Ar arc-melting technique, and the cast samples were homogenized at 1800 °C for 24 h in an Ar atmosphere. High-resolution high-angle annular dark-field scanning transmission electron microscopy observations strongly suggest that Re preferentially occupies the Mo sites in the Mo-B layers of the T2 unit cell, which was confirmed by the site-occupation behavior predicted by first-principles calculations. Nanoindentation measurements indicate that the hardness of the T2 phase is affected by both the off-stoichiometry and Re addition.

AB - The site-occupation behavior of Re in Mo5SiB2 (T 2) was studied both theoretically and experimentally, and the effect of Re on the solid-solution hardening of T2 was investigated by taking into account the off-stoichiometry of the T2 phase. Mo-Si-B quaternary alloys containing 1.4 at.% Re were produced using a conventional Ar arc-melting technique, and the cast samples were homogenized at 1800 °C for 24 h in an Ar atmosphere. High-resolution high-angle annular dark-field scanning transmission electron microscopy observations strongly suggest that Re preferentially occupies the Mo sites in the Mo-B layers of the T2 unit cell, which was confirmed by the site-occupation behavior predicted by first-principles calculations. Nanoindentation measurements indicate that the hardness of the T2 phase is affected by both the off-stoichiometry and Re addition.

KW - A. Intermetallics

KW - B. Solid-solution hardening

KW - D. Site occupancy

KW - E. Ab-initio calculations

KW - F. Nanoindentation

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