Journal ArticleDOI
Ageing-induced two-stage R-phase transformation in Ti – 50.9at.%Ni
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TLDR
In this paper, the effects of low temperature ageing on the transformation behavior of a Ti-50.9at. alloy were investigated by means of differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and transmission electron microscopy (TEM).About:
This article is published in Acta Materialia.The article was published on 2004-01-19. It has received 199 citations till now. The article focuses on the topics: Diffusionless transformation & R-Phase.read more
Citations
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Thermal processing of polycrystalline NiTi shape memory alloys
TL;DR: In this paper, the effect of heat treatment on polycrystalline NiTi was examined in terms of both uniaxial monotonic testing and instrumented Vickers micro-indentation.
Journal ArticleDOI
Elementary martensitic transformation processes in Ni-rich NiTi single crystals with Ni4Ti3 precipitates
TL;DR: In this paper, multiple-step martensitic transformations can be observed in aged Ni-rich NiTi single crystals using differential scanning calorimetry and in situ transmission electron microscopy.
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Introduction of antibacterial function into biomedical TiNi shape memory alloy by the addition of element Ag
TL;DR: The cytotoxicity evaluation revealed that Ti NiAg alloy extract induced slight toxicity to cells, but the viability of experimental cells was similar to or higher than that of TiNi alloy extract, and the corresponding antibacterial mechanism for the TiNiAg alloy is discussed.
Journal ArticleDOI
Effect of ageing treatment on the transformation behaviour of Ti–50.9 at.% Ni alloy
TL;DR: This article investigated the effect of ageing on the transformation behavior of a Ti-509% at% Ni alloy and found that aging at below 573 k was found to suppress the original A-↔-M transformation.
Journal ArticleDOI
Origin of 2-stage R-phase transformation in low-temperature aged Ni-rich Ti–Ni alloys
Yumei Zhou,Jian Zhang,Genlian Fan,Xiangdong Ding,Jun Sun,Xiaobing Ren,Xiaobing Ren,Kazuhiro Otsuka,Kazuhiro Otsuka +8 more
TL;DR: In this article, the grain boundary effect and composition effect of Ni-rich Ti-Ni alloys were investigated by considering grain boundary and composition effects, and it was found that all single crystals undergo 1-stage R-phase transformation; in contrast, the transformation behavior of polycrystals is dependent on Ni content.
References
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Book
Engineering Aspects of Shape Memory Alloys
TL;DR: An introduction to martensite and shape memory, CMWayman and TWDuerig shape memory and transformation behavior of mariensitic Ti-Pd-Ni andTi-Pt-Ni alloys, PGLindquit and CMMayman the mechanical aspects of constrained recovery, JLProft and TWduerig the design of electrical interconnection systems with shape memory alloys as mentioned in this paper, ECydzik actuator and work production devices.
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Ni4Ti3-precipitation during aging of NiTi shape memory alloys and its influence on martensitic phase transformations
TL;DR: In this paper, the microstructure of a Ni-rich NiTi shape memory alloy and its influence on the thermal characteristics of martensitic transformations were studied. But the authors did not consider the effect of stress on the precipitation process of Ni4Ti3-precipitates.
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Deformation and transition behavior associated with theR-phase in Ti-Ni alloys
Shuichi Miyazaki,Kazuhiro Otsuka +1 more
TL;DR: In this paper, the deformation behavior associated with the R-phase (rhombohedral phase) transition and the subsequent martensitic transformation was studied systematically in Ti-Ni alloys by tensile testing over a wide temperature range.
Journal ArticleDOI
Effect of thermal cycling on the transformation temperatures of TiNi alloys
TL;DR: In this paper, the effect of thermal cycling on the transformation temperatures was investigated in Ti-Ni alloys which were subjected to various types of thermo-mechanical treatments in solution-treated specimens with various Ni-contents, and it was concluded that the shift of the transformation temperature with thermal cycling is due to the introduction of dislocations, but not due to any ageing effect nor due to a change in the degree of order during thermal cycling.
Journal ArticleDOI
The mechanism of multistage martensitic transformations in aged Ni-rich NiTi shape memory alloys
TL;DR: In this article, the authors used differential scanning calorimetry (DSC) for a systematic investigation of the evolution of transformation behavior with ageing temperature and time, and demonstrated that during ageing of Ni-rich NiTi alloys, DSC curves exhibit two transformation peaks on cooling after short ageing times, three after intermediate ageing times and finally again two peaks after long ageing times.