Effect of heat treatment on transformation behavior of Ti–Ni–V shape memory alloy

Zhang, He; Liu, Manqian

doi:10.1016/j.msea.2011.05.087

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Similar results were also mentioned by Kim et al 7 In other words, recrystallisation probably occurred between 500 and 600 C, and the grains start to grow after annealing at 600 C, which had also been stated by Sadiq et al 16 and He and Liu. 17 Figures 3 and 4 also show that besides B2 and B19 0 phases, precipitates were also observed in microstructures of samples including as-received and sample annealed at 600 C. Some of them are pointed by arrows in both figures. In order to investigate the composition of these precipitates, EDX analysis was conducted on the samples and the result is presented in Figure 5.…”

Section: Microstructure Analysismentioning

confidence: 82%

Effect of annealing on the microstructures and deformation behaviour of Ti–50.7at.%Ni shape memory alloy

Hastuti

Hamzah

Hashim

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this paper Ti-50.7at.%Ni as a commercial material was examined to analyse the effect of annealing temperature on the microstructure and deformation behaviour. It was found that the microstructure and deformation behaviour of asreceived material was affected by the existence of dislocations that was introduced during manufacturing process. The presence of martensite variant and the B2 austenite broadening in XRD spectra of as-received material verified this conclusion. However, annealing treatment has gradually eliminated this effect. The plateau region on stress-strain curve which was absent in the as-received material started to appear and get longer with increasing annealing temperature. Maximum tensile strength was observed in the sample annealed at 400 C for 1 h. Annealing treatment above 500 C transformed the B19 0 martensite to B2 austenite, which leads to a decrease in the tensile strength of the material. Nearly perfect superelasticity was found in the as-received material and sample annealed at 300 C.

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Section: Microstructure Analysismentioning

confidence: 82%

Effect of annealing on the microstructures and deformation behaviour of Ti–50.7at.%Ni shape memory alloy

Hastuti

Hamzah

Hashim

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…5 shows the differential scanning calorimetry (DSC) curve of the V45Ti30Ni25 alloy in comparison with a standard Nitinol shape memory alloy (Ti50Ni50). Both the austenite to martensite transformation and the reverse transformation in the V45Ti30Ni25 alloy separate into two stages (B2 to rhombohedral R-phase and R-phase to monoclinic B19' [67]), whereas this is a one stage transformation in Ti50Ni50. Most importantly, all transformations shift toward lower temperatures, which are below room temperature, and the austenite finish temperature is only slightly higher than the martensite start temperature.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Design of a V–Ti–Ni alloy with superelastic nano-precipitates

et al. 2020

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Stress-induced martensitic transformations enable metastable alloys to exhibit enhanced strain hardening capacity, leading to improved formability and toughness. As is well-known from transformation-induced plasticity (TRIP) steels, however, the resulting martensite can limit ductility and fatigue life due to its intrinsic brittleness. In this work, we explore an alloy design strategy that utilizes stress-induced martensitic transformations but does not retain the martensite phase. This strategy is based on the introduction of superelastic nano-precipitates, which exhibit reverse transformation after initial stress-induced forward transformation. To this end, utilizing ab-initio simulations and thermodynamic calculations we designed and produced a V45Ti30Ni25 (at%) alloy. In this alloy, TiNi is present as nano-precipitates uniformly distributed within a ductile V-rich base-centered cubic (bcc) β matrix, as well as being present as a larger matrix phase. We characterized the microstructure of the produced alloy using various scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. The bulk mechanical properties of the alloy are demonstrated through tensile tests, and the reversible transformation in each of the TiNi morphologies were confirmed by in-situ TEM micro-pillar compression experiments, in-situ high-energy diffraction synchrotron cyclic tensile tests, indentation experiments, and differential scanning calorimetry experiments. The observed transformation pathways and variables impacting phase stability are critically discussed

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“…Diantara paduan Ti-Ni yang memiliki sifat shape memory, paduan dengan komposisi atom hampir sama (nearequiatomic composition) adalah paduan yang paling banyak digunakan karena memiliki kombinasi yang baik antara sifat shape memory dan superelastisiti serta sifat mekanis dan ketahanan korosi yang baik (Nishida & Wayman, 1987;He & Liu, 2011;Zhou et al, 2005). Khususnya untuk paduan Ti-Ni yang mengandng ≥ 50.6 at.% Ni, dikenal juga sebagai paduan kaya Ni (Ni rich near-equiatomic composition), sangat menarik untuk dikembangkan dalam berbagai aplikasi karena temperatur transisi fasa dapat dikontrol dengan kandungan Ni (Michutta et al, 2006;Khalil-allafi et al, 2002;Dlouhy et al, 2003).…”

Section: Pendahuluanunclassified

PENGARUH TEMPERATUR AGING TERHADAP TEMPERATUR TRANSFORMASI PADUAN Ti-50.7at.%Ni SHAPE MEMORY

Hastuti¹,

Hamzah²,

Hashim³

2016

J. Konversi Energi dan Manufaktur

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Tujuan penelitian ini adalah untuk mengetahui pengaruh temperatur aging terhadap temperatur transformasi paduan Ti-50.7at%Ni. Temperatur transformasi menjadi sangat penting pada material paduan shape memory karena sifat superelastisdan shape memory hanya akan dihasilkan pada temperatur tertentu sehingga membatasi penggunaan material ini. Padapenelitian ini, material diberi perlakuan panas dengan cara solution treatment pada 900oC selama satu jam diikuti denganpendinginan dalam air. Selanjutnya aging pada empat temperature yang berbeda yaitu 300oC, 400oC, 500oC dan 600oC.Temperature transformasi diamati dengan menggunakan Differential Scanning Calorimetry (DSC). Hasil penelitianmenunjukkan kehadiran B19â€² martensit dalam struktur mikro material as-received tidak dapat dijelaskan dengan hasil grafikDSC. Hal ini dimungkinkan karena masih adanya pengaruh rolling dingin pada saat proses pembuatan plat yangmenyisakan kehadiran dislokasi di dalam material. Dislokasi ini menyebabkan martensit hadir pada temperature yang lebihtinggi dari seharusnya. Aging pada temperature yang bervariasi yaitu 300oC, 400oC, 500oC dan 600oC menyebabkantransformasi fasa dalam material Ti-50.7at.%Ni terjadi dalam dua tahap, yaitu B2 austenit bertransformasi menjadi fasaintermediate R, selanjutnya fasa ini akan bertransformasi menjadi B19â€² martensit.

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Effect of heat treatment on transformation behavior of Ti–Ni–V shape memory alloy

Cited by 7 publications

References 14 publications

Effect of annealing on the microstructures and deformation behaviour of Ti–50.7at.%Ni shape memory alloy

Effect of annealing on the microstructures and deformation behaviour of Ti–50.7at.%Ni shape memory alloy

Design of a V–Ti–Ni alloy with superelastic nano-precipitates

PENGARUH TEMPERATUR AGING TERHADAP TEMPERATUR TRANSFORMASI PADUAN Ti-50.7at.%Ni SHAPE MEMORY

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