Microstructures and Mechanical Properties of Shape Memory Alloy Using Pre-mixed TiNi Powders with TiO2 Particles

SOBA Ryoichi, TANABE Yukiko, YONEZAWA Takayuki, UMEDA Junko, KONDOH Katsuyoshi

doi:10.2497/jjspm.64.589

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Other Title

TiO2粒子添加TiNi混合素粉末焼結材の組織と力学特性
TiO₂粒子添加TiNi混合素粉末焼結材の組織と力学特性
TiO ₂ リュウシテンカ TiNi コンゴウソフンマツショウケツザイノソシキトリキガクトクセイ

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Description

In this study, microstructural and mechanical properties of the extruded and heat-treated TiNi alloys by sintering the mixture of TiNi pre-mixed powder with titanium dioxide (TiO₂) particles were investigated. Pure Ti and pure Ni powder with TiO₂ particles were mixed and consolidated by spark plasma sintering (SPS). SPSed TiNi alloy compacts were extruded and heat-treated subsequently. SPSed TiNi alloy compacts had TiNi matrix and Ti₄Ni₂O phase. Ti₄Ni₂O phase was formed during SPS by reaction between TiNi matrix and oxygen atoms originated from additive TiO₂ particles. Consequently, the heat-treated Ti-50.5 at.%Ni alloy using pre-mixed powder with 1.0 vol.% TiO₂ particles showed a high plateau stress of 630 MPa and a good shape recovery of 79.7% in 8% strain applied. The heat-treated TiNi alloy with 1.0 vol.% TiO₂ particles revealed the high strength and good shape memory properties. The high strengthening mechanism of the TiNi alloy using pre-mixed powder with TiO₂ particles was mainly due to a decrease martensitic transformation temperature by an increase soluted Ni content in TiNi matrix after reaction between TiNi and TiO₂.

Journal

Journal of the Japan Society of Powder and Powder Metallurgy

Journal of the Japan Society of Powder and Powder Metallurgy 64 (11), 589-594, 2017

Japan Society of Powder and Powder Metallurgy

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Microstructures and Mechanical Properties of Shape Memory Alloy Using Pre-mixed TiNi Powders with TiO<sub>2</sub> Particles