Effect of Shape Memory Heat Treatment on Microstructures and Mechanical Properties of Powder Metallurgy TiNi Shape Memory Alloy

Soba, Ryoichi; Tanabe, Yukiko; Yonezawa, Takayuki; Umeda, Junko; Kondoh, Katsuyoshi

doi:10.2497/jjspm.65.85

Cited by 2 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ALCHEMI method using TEM-EDS analysis was applied to identify the solution sites of Co atoms in the matrix. ALCHEMI method 15) enables to determine the solid solution site by determining whether the intensity change of the Co element follows that of Ti or Ni element when the peak intensity of each element is measured by TEM-EDS by changing the incidence direction of the electron beam to the crystal. Figure 12 reveals the peak intensity measurement of each element by TEM-EDS analysis with changing the incidence angle.…”

Section: Microstructures Changes In Tini Parent Phase Bymentioning

confidence: 99%

Phase Transformation Control of Powder Metallurgy Super-Elastic Ti–Ni Alloy by Adding Co Element

et al. 2019

Self Cite

View full text Add to dashboard Cite

In order to improve the controllability of the mechanical properties of powder metallurgy (PM) titanium (Ti)-nickel (Ni) super-elastic alloys, cobalt (Co) powder was added to the alloys up to 2.0 at%. In particular, the dependence of plateau stress and recovery rate in tensile hysteresis test on cobalt content was investigated by considering microstructures analysis results. XRD and TEM-EDS analysis clarified cobalt elements existed as substitutional solution atoms in Ni atom sites of TiNi alloys. It was confirmed that PM TiNiCo alloys with the cobalt content of 1.0 at% Co or less showed a high shape recovery rate of around 90% or more. In addition, the increment of the plateau stress of TiNiCo alloys was almost constant regardless of the holding time in heat treatment. That is, the cobalt solution content had no effect on the amount and size of Ti 3 Ni 4 precipitates. Therefore, it was possible to independently control the plateau stress without affecting the critical slip strain by adding cobalt element to TiNi alloys.

show abstract

Section: Microstructures Changes In Tini Parent Phase Bymentioning

confidence: 99%

Phase Transformation Control of Powder Metallurgy Super-Elastic Ti–Ni Alloy by Adding Co Element

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

Phase Transformation Control of Powder Metallurgy Super-elastic Ti-Ni Alloy by Adding Co Element

Eda

Khantachawana

Umeda

et al. 2019

J. Jpn. Soc. Powder Powder Metallurgy

View full text Add to dashboard Cite

In order to improve the controllability of the mechanical properties of powder metallurgy (PM) titanium (Ti)-nickel (Ni) super-elastic alloys, cobalt (Co) powder was added to the alloys up to 2.0 at.%. In particular, the dependence of plateau stress and recovery rate in tensile hysteresis test on Co content was investigated by considering microstructures analysis results. XRD and TEM-EDS analysis clarified Co elements existed as substitutional solution atoms in Ni atom sites of Ti-Ni alloys. It was confirmed that PM Ti-Ni-Co alloys with the Co content of 1.0 at.% Co or less showed a high shape recovery rate of around 90% or more. In addition, the increment of the plateau stress of Ti-Ni-Co alloys was almost constant regardless of the holding time in heat treatment. That is, the Co solution content had no effect on the amount and morphological size of Ti 3 Ni 4 precipitates. Therefore, it was possible to independently control the plateau stress without affecting sliding critical strain by adding Co element to Ti-Ni alloys.

show abstract

Effect of Shape Memory Heat Treatment on Microstructures and Mechanical Properties of Powder Metallurgy TiNi Shape Memory Alloy

Cited by 2 publications

References 10 publications

Phase Transformation Control of Powder Metallurgy Super-Elastic Ti–Ni Alloy by Adding Co Element

Phase Transformation Control of Powder Metallurgy Super-Elastic Ti–Ni Alloy by Adding Co Element

Phase Transformation Control of Powder Metallurgy Super-elastic Ti-Ni Alloy by Adding Co Element

Contact Info

Product

Resources

About