Oxidation-induced strengthening and toughening behavior in micro- and nano-composites of Y2O3/SiC system

Masashi Yoshimura; Tatsuki Ohji; Mutsuo Sando; Yong Ho Choa; Tohru Sekino; Koichi Niihara

doi:10.1016/S0167-577X(97)00253-X

Oxidation-induced strengthening and toughening behavior in micro- and nano-composites of Y₂O₃/SiC system

Masashi Yoshimura, Tatsuki Ohji, Mutsuo Sando, Yong Ho Choa, Tohru Sekino, Koichi Niihara

Institute of Multidisciplinary Research for Advanced Materials (IMRAM)

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

8 Citations (Scopus)

Abstract

Effects of oxidation on mechanical properties has been investigated for micro- and nano-composites of Y₂O₃-SiC systems. SiC particles with mean sizes of 5 μm and 300 nm were dispersed in the former and latter material, respectively. The room temperature fracture strength and toughness increased after oxidation around 900-1000°C for both the composites; the nanocomposite showed much larger increases than the micro-composite. The micro structural observations and the residual stress measurements revealed that these improvements are mainly due to the surface compressive stress generated by the oxidized SiC particles.

Original language	English
Pages (from-to)	139-143
Number of pages	5
Journal	Materials Letters
Volume	35
Issue number	3-4
DOIs	https://doi.org/10.1016/S0167-577X(97)00253-X
Publication status	Published - 1998 May

Keywords

Fracture strength
Heat treatment
Nanocomposites
Silicon carbide
Yttrium oxide

ASJC Scopus subject areas

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

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10.1016/S0167-577X(97)00253-X

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title = "Oxidation-induced strengthening and toughening behavior in micro- and nano-composites of Y2O3/SiC system",

abstract = "Effects of oxidation on mechanical properties has been investigated for micro- and nano-composites of Y2O3-SiC systems. SiC particles with mean sizes of 5 μm and 300 nm were dispersed in the former and latter material, respectively. The room temperature fracture strength and toughness increased after oxidation around 900-1000°C for both the composites; the nanocomposite showed much larger increases than the micro-composite. The micro structural observations and the residual stress measurements revealed that these improvements are mainly due to the surface compressive stress generated by the oxidized SiC particles.",

keywords = "Fracture strength, Heat treatment, Nanocomposites, Silicon carbide, Yttrium oxide",

author = "Masashi Yoshimura and Tatsuki Ohji and Mutsuo Sando and Choa, {Yong Ho} and Tohru Sekino and Koichi Niihara",

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T1 - Oxidation-induced strengthening and toughening behavior in micro- and nano-composites of Y2O3/SiC system

AU - Yoshimura, Masashi

AU - Ohji, Tatsuki

AU - Sando, Mutsuo

AU - Choa, Yong Ho

AU - Sekino, Tohru

AU - Niihara, Koichi

PY - 1998/5

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N2 - Effects of oxidation on mechanical properties has been investigated for micro- and nano-composites of Y2O3-SiC systems. SiC particles with mean sizes of 5 μm and 300 nm were dispersed in the former and latter material, respectively. The room temperature fracture strength and toughness increased after oxidation around 900-1000°C for both the composites; the nanocomposite showed much larger increases than the micro-composite. The micro structural observations and the residual stress measurements revealed that these improvements are mainly due to the surface compressive stress generated by the oxidized SiC particles.

AB - Effects of oxidation on mechanical properties has been investigated for micro- and nano-composites of Y2O3-SiC systems. SiC particles with mean sizes of 5 μm and 300 nm were dispersed in the former and latter material, respectively. The room temperature fracture strength and toughness increased after oxidation around 900-1000°C for both the composites; the nanocomposite showed much larger increases than the micro-composite. The micro structural observations and the residual stress measurements revealed that these improvements are mainly due to the surface compressive stress generated by the oxidized SiC particles.

KW - Fracture strength

KW - Heat treatment

KW - Nanocomposites

KW - Silicon carbide

KW - Yttrium oxide

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