Grain growth and precipitation in an annealed cold-rolled Ni50.2Ti49.8 alloy

Srivastava, Arvind K.; Schryvers, D.; Humbeeck, Jan Van

doi:10.1016/j.intermet.2007.06.003

Cited by 50 publications

(18 citation statements)

References 27 publications

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“…Ewert et al 24) found an exothermic peak around 350 C on the DSC curve of the as-rolled TiNi alloy, and the area of the peak increased with the increasing of cold-rolling reduction, when they focused on the transformation behavior of TiNi alloy with the different cold rolling reduction. The same phenomenon was found by A. K. Srivastava et al 25) and K. Inaekyan et al 26) They found this exothermic peak is associated with the recrystallization of the amorphous phase induced by the cold-rolling. So, it could be a reasonable explanation for the exothermic peak in our present work.…”

Section: Resultssupporting

confidence: 80%

The Influence of Cold-Rolling on the Internal Friction Behavior of TiNi Shape Memory Alloy

et al. 2011

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This work is focused on the influence of cold-rolling on the transformation and internal friction behavior of TiNi shape memory alloy. The DSC results show the endothermic peaks disappeared with the increasing of cold-rolling reduction and there was an exothermic peak around 330 C on the curve during the first heating process. The exothermic peak is associated with recrystallization of amorphous phase induced by cold-rolled work. During the second heating process, the endothermic peak showed up but the exothermic peak didn't. These phenomena are confirmed by the internal friction results. During the first heating process, the transformation internal friction decreased with the increasing of the cold-rolling reduction and the internal friction augmentation appeared around 330 C which is related to recrystallization.

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Section: Resultssupporting

confidence: 80%

The Influence of Cold-Rolling on the Internal Friction Behavior of TiNi Shape Memory Alloy

et al. 2011

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“…Figure 4 (0 ms) shows also white stripes repeatedly found throughout the FIB slab. Similar amorphous bands have been reported for heavily cold-rolled Ni-Ti alloys [18][19][20]. The microstructure (Fig.…”

Section: Transmission Electron Microscopy Investigationssupporting

confidence: 84%

“…It has already been reported in the literature that Ni-Ti can be relatively easily processed by various SPD methods (rolling [18,19,21], ECAP [20]) so it becomes partially or even completely amorphous [22]. The novel feature reported in this manuscript is that similar partially amorphous microstructure exists also in commercial superelastic thin Ni-Ti wires and that this microstructure can be manipulated in a very controlled manner by the FTMT-EC treatment so that the wire is shape set and the required FSP of the wire are obtained.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and functional superelasticity property changes in thin NiTi wires heat treated by electric current

Malard

Pilch

Šittner

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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High energy synchrotron X-ray diffraction, transmission electron microscopy and mechanical testing were employed to investigate the evolution of microstructure, texture and functional superelastic properties of 0.1 mm thin as drawn Ni-Ti wires subjected to a nonconventional heat treatment by controlled electric current (FTMT-EC method). As drawn Ni-Ti wires were prestrained in tension and exposed to a sequence of short DC power pulses in the millisecond range. The annealing time in the FTMT-EC processing can be very short but the temperature and force could be very high compared to the conventional heat treatment of SMAs. It is shown that the heavily strained, partially amorphous microstructure of the as drawn Ni-Ti wire transforms under the effect of the DC pulse and tensile stress into a wide range of annealed nanosized microstructures depending on the pulse time. The functional superelastic properties and microstructures of the FTMT-EC treated Ni-Ti wire are comparable to those observed in straight annealed wires.

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“…In our study, it was also observed that the microhardness values are similar to those observed from grain-refined alloy resulting from the HPT followed by PDA process [26][27][28]. Shahmir et al acquired very similar range of Vickers microhardness values after quasi-constrained HPT through 10 turns and PDA 10 min at 400 0 C [29].…”

Section: Figure 1 Plots Of Hshpt Parameters Versus Timesupporting

confidence: 83%

Investigation of microhardness evolution in an ultrafine grained NiTi alloy formed via high speed high pressure torsion (HSHPT)

Gurău

Sampath

2015

MATEC Web of Conferences

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Abstract. An investigation was conducted so as to evaluate the homogeneity of microstructure and mechanical properties of an NiTi shape memory alloy subjected to high speed high pressure torsion (HSHPT). The alloy chosen for the study had 50.3 at.% of Ni in its composition and was supplied in the form of hot extruded rods of 9 mm diameter. The final shape achieved after severe plastic deformation was a disc, whose diameter and thickness measured 40 mm and 0.18 mm, respectively. The TEM studies and the microhardness determination using a Vickers hardness tester revealed the effect of dynamic recrystallisation, which is very unique to severe plastic deformation involving HSHPT. An analysis of the microhardness data shows that the disc-shaped element is essentially homogeneous. In addition, the microhardness increases with the increase in accumulated strain. The results are presented and discussed in detail in the paper..

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Grain growth and precipitation in an annealed cold-rolled Ni50.2Ti49.8 alloy

Cited by 50 publications

References 27 publications

The Influence of Cold-Rolling on the Internal Friction Behavior of TiNi Shape Memory Alloy

The Influence of Cold-Rolling on the Internal Friction Behavior of TiNi Shape Memory Alloy

Microstructure and functional superelasticity property changes in thin NiTi wires heat treated by electric current

Investigation of microhardness evolution in an ultrafine grained NiTi alloy formed via high speed high pressure torsion (HSHPT)

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