Strengthening Mechanism of TiNi Shape Memory Sintered Alloy using Elemental Mixtures of Pre-alloyed TiNi Powder and TiO_2 Particles

Yonezawa, Takayuki; Yoshimura, Tomohiro; Umeda, Junko; Kondoh, Katsuyoshi; Souba, Ryouichi

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論文情報

タイトル	Strengthening Mechanism of TiNi Shape Memory Sintered Alloy using Elemental Mixtures of Pre-alloyed TiNi Powder and TiO_2 Particles
著者	NRID 1000020410665 1000020410665 著者名 Yonezawa, Takayuki
	著者名 Yoshimura, Tomohiro
	NRID 1000050345162 1000050345162 著者名 Umeda, Junko
	NRID 1000050345138 1000050345138 著者名 Kondoh, Katsuyoshi
	著者名 Souba, Ryouichi
キーワード等	Shape memory alloys
	Titanium-nickel
	Pre-alloyed powder
	Titanium dioxide
	Powder metallurgy
	Plateau stress
抄録	The mechanical properties and the strengthening mechanism of the extruded and heat-treated titanium-nickel (TiNi) shape memory alloys (SMAs) prepared by powder metallurgy (P/M) were investigated. TiNi pre-alloyed powder was mixed with titanium dioxide (TiO_2) particles by a planetary ball mill, and consolidated by spark plasma sintering (SPS) at a sintering temperature of 1173 K in vacuum (6 Pa). Subsequently, the SPSed TiNi alloy compacts were extruded at a pre-heated temperature of 1373 K, and shape memory heat-treated at a holding temperature of 773 K. Ti_4Ni_2O phases formed by reaction between the TiNi matrix and the additive TiO_2 particles caused an increase of the soluted Ni content of the matrix, and resulted in a decrease of the martensitic transformation temperature of the TiNi matrix. Consequently, the extruded and heat-treated TiNi powder alloy with 1.0 vol.% TiO_2 particles showed a remarkably high plateau stress of 524 MPa and ultimate tensile strength (UTS) of 1298 MPa at room temperature (298 K), respectively. It also revealed a good shape recovery rate of 89.3 % when 8% tensile strain was applied.
出版者	大阪大学接合科学研究所
	Joining and Welding Research Institute, Osaka University
	オオサカダイガクセツゴウカガクケンキュウジョ
収録物名	Transactions of JWRI
巻	41
号	2
開始ページ	55
終了ページ	59
刊行年月	2012-12
言語	英語
ハンドルURL	https://hdl.handle.net/11094/24867
ISSN	03874508
NCID	AA00867058
アクセス権	open access
出版タイプ	Version of Record
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.41 No.2 (2012-12)

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.41(2) p.55-p.59
DC.title	Strengthening Mechanism of TiNi Shape Memory Sintered Alloy using Elemental Mixtures of Pre-alloyed TiNi Powder and TiO_2 Particles
DC.creator	Yonezawa, Takayuki
	Yoshimura, Tomohiro
	Umeda, Junko
	Kondoh, Katsuyoshi
	Souba, Ryouichi
DC.publisher	大阪大学接合科学研究所
	Joining and Welding Research Institute, Osaka University
	オオサカダイガクセツゴウカガクケンキュウジョ
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2012-12
DC.subject	Shape memory alloys
	Titanium-nickel
	Pre-alloyed powder
	Titanium dioxide
	Powder metallurgy
	Plateau stress
DCTERMS.abstract	The mechanical properties and the strengthening mechanism of the extruded and heat-treated titanium-nickel (TiNi) shape memory alloys (SMAs) prepared by powder metallurgy (P/M) were investigated. TiNi pre-alloyed powder was mixed with titanium dioxide (TiO_2) particles by a planetary ball mill, and consolidated by spark plasma sintering (SPS) at a sintering temperature of 1173 K in vacuum (6 Pa). Subsequently, the SPSed TiNi alloy compacts were extruded at a pre-heated temperature of 1373 K, and shape memory heat-treated at a holding temperature of 773 K. Ti_4Ni_2O phases formed by reaction between the TiNi matrix and the additive TiO_2 particles caused an increase of the soluted Ni content of the matrix, and resulted in a decrease of the martensitic transformation temperature of the TiNi matrix. Consequently, the extruded and heat-treated TiNi powder alloy with 1.0 vol.% TiO_2 particles showed a remarkably high plateau stress of 524 MPa and ultimate tensile strength (UTS) of 1298 MPa at room temperature (298 K), respectively. It also revealed a good shape recovery rate of 89.3 % when 8% tensile strain was applied.
DC.format	application/pdf
citation_title	Strengthening Mechanism of TiNi Shape Memory Sintered Alloy using Elemental Mixtures of Pre-alloyed TiNi Powder and TiO_2 Particles
citation_author	Yonezawa, Takayuki
	Yoshimura, Tomohiro
	Umeda, Junko
	Kondoh, Katsuyoshi
	Souba, Ryouichi
citation_publisher	大阪大学接合科学研究所
	Joining and Welding Research Institute, Osaka University
	オオサカダイガクセツゴウカガクケンキュウジョ
citation_language	英語
citation_date	2012-12
citation_journal_title	Transactions of JWRI
citation_volume	41
citation_issue	2
citation_firstpage	55
citation_lastpage	59
citation_issn	03874508
citation_public_url	https://hdl.handle.net/11094/24867

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