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

doi:https://doi.org/10.18910/24867

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 et al.

Transactions of JWRI, 2012, 41(2), 55-59

アクセス数:490件（2025-07-07 08:14 集計）

固定URL: https://doi.org/10.18910/24867

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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 researchmap permalink umeda umeda Scopus Author ID 23478776500 23478776500 ORCID 0000-0001-8678-9708 0000-0001-8678-9708 著者名 Umeda, Junko
	NRID 1000050345138 1000050345138 researchmap permalink kondoh kondoh Scopus Author ID 9942942300 9942942300 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
	オオサカダイガクセツゴウカガクケンキュウジョ
	Joining and Welding Research Institute, Osaka University
収録物名	Transactions of JWRI
巻(号)	41(2)
ページ	55-59
刊行年月	2012-12
言語	英語
ハンドルURL	https://hdl.handle.net/11094/24867
DOI	https://doi.org/10.18910/24867
PISSN	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. 2012, 41(2), p. 55-59
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
	オオサカダイガクセツゴウカガクケンキュウジョ
	Joining and Welding Research Institute, Osaka University
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.identifier	10.18910/24867
DC.format	24867
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
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_public_url	https://hdl.handle.net/11094/24867
citation_doi_detail	10.18910/24867
citation_doi	https://doi.org/10.18910/24867

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

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