Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles

Mimoto, Takanori; Nakanishi, Nozomi; Umeda, Junko; Kondoh, Katsuyoshi

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タイトル	Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles
著者	Mimoto, Takanori Mimoto, Takanori
	Nakanishi, Nozomi Nakanishi, Nozomi
	Umeda, Junko Umeda, Junko
	Kondoh, Katsuyoshi Kondoh, Katsuyoshi
キーワード等	Titanium matrix composite
	Carbon black particles
	Tensile properties
	Solid solution hardening
	Dispersion strengthening
	In-situ formed titanium carbide
抄録	The strengthening mechanisms of titanium-carbon black (CB) nano particle composite materials were investigated quantitatively in the present study. The titanium matrix composite (TMC) specimens were prepared via a powder metallurgy (P/M) route including the wet coating process for composite titanium (Ti) powders with un-bundled CB nano particles, consolidation by spark plasma sintering (SPS) and subsequent hot extrusion. The extruded TMC, with carbon content of 2.66 at.%, exhibited excellent tensile strength of 837 MPa in 0.2%YS, 899 MPa in UTS and 18.7% in elongation at ambient temperature. In this composite, some of additive CB nano particles were dissolved into the Ti matrix as a solid solution element. The other CBs and Ti matrix were chemically reacted when sintering, and resulted in the in-situ formed titanium carbide (TiC) compounds, which were uniformly distributed throughout the Ti matrix. These TiC dispersoids promoted the dynamic recrystallization during hot extrusion process, and resulted in the Ti grain refinement. Consequently, carbon solid solution hardening, TiC dispersion strengthening and grain refinement enhanced the mechanical performance of the TMC. In particular, the effect of TiC reinforcements, accounting for about 60% of the whole strengthening behavior, played the most significant role.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	40
号	2
開始ページ	63
終了ページ	68
刊行年月	2011-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/5200
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.40 No.2 (2011-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.40(2) P.63-P.68
DC.title	Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles
DC.creator	Mimoto, Takanori
	Nakanishi, Nozomi
	Umeda, Junko
	Kondoh, Katsuyoshi
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2011-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/5200
DC.subject	Titanium matrix composite
	Carbon black particles
	Tensile properties
	Solid solution hardening
	Dispersion strengthening
	In-situ formed titanium carbide
DCTERMS.abstract	The strengthening mechanisms of titanium-carbon black (CB) nano particle composite materials were investigated quantitatively in the present study. The titanium matrix composite (TMC) specimens were prepared via a powder metallurgy (P/M) route including the wet coating process for composite titanium (Ti) powders with un-bundled CB nano particles, consolidation by spark plasma sintering (SPS) and subsequent hot extrusion. The extruded TMC, with carbon content of 2.66 at.%, exhibited excellent tensile strength of 837 MPa in 0.2%YS, 899 MPa in UTS and 18.7% in elongation at ambient temperature. In this composite, some of additive CB nano particles were dissolved into the Ti matrix as a solid solution element. The other CBs and Ti matrix were chemically reacted when sintering, and resulted in the in-situ formed titanium carbide (TiC) compounds, which were uniformly distributed throughout the Ti matrix. These TiC dispersoids promoted the dynamic recrystallization during hot extrusion process, and resulted in the Ti grain refinement. Consequently, carbon solid solution hardening, TiC dispersion strengthening and grain refinement enhanced the mechanical performance of the TMC. In particular, the effect of TiC reinforcements, accounting for about 60% of the whole strengthening behavior, played the most significant role.
citation_title	Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles
citation_author	Mimoto, Takanori
	Nakanishi, Nozomi
	Umeda, Junko
	Kondoh, Katsuyoshi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2011-12
citation_journal_title	Transactions of JWRI
citation_volume	40
citation_issue	2
citation_firstpage	63
citation_lastpage	68
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/5200
citation_keywords	Titanium matrix composite
	Carbon black particles
	Tensile properties
	Solid solution hardening
	Dispersion strengthening
	In-situ formed titanium carbide

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