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

Number of Access:538（2025-08-25 05:43 Counts）

Identifier to cite or link to this item: https://doi.org/10.18910/24867

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Title
Strengthening Mechanism of TiNi Shape Memory Sintered Alloy using Elemental Mixtures of Pre-alloyed TiNi Powder and TiO_2 Particles
Creator
NRID
1000020410665 1000020410665
CreatorName
Yonezawa, Takayuki
CreatorName
Yoshimura, Tomohiro
NRID
1000050345162 1000050345162
researchmap permalink
umeda umeda
Scopus Author ID
23478776500 23478776500
ORCID
0000-0001-8678-9708 0000-0001-8678-9708
CreatorName
Umeda, Junko
NRID
1000050345138 1000050345138
researchmap permalink
kondoh kondoh
Scopus Author ID
9942942300 9942942300
CreatorName
Kondoh, Katsuyoshi
CreatorName
Souba, Ryouichi
Subject
Shape memory alloys
Titanium-nickel
Pre-alloyed powder
Titanium dioxide
Powder metallurgy
Plateau stress
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.
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
Source Title
Transactions of JWRI
Volume (Issue)
41(2)
Page
55-59
Date of Issued
2012-12
Language
English
Handle URL
https://hdl.handle.net/11094/24867
DOI
https://doi.org/10.18910/24867
PISSN
03874508
NCID
AA00867058
Access Rights
open access
oaire:version
Version of Record
Category
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.41 No.2 (2012-12)