Morphological and structural evaluation of nanocrystalline NiTiCu shape memory alloy prepared via mechanical alloying and annealing

Ghadimi, Morteza; Shokuhfar, Ali; Zolriasatein, Ashkan; Rostami, Hamid Reza

doi:10.1016/j.matlet.2012.09.008

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…Except for TNC15, the entire composition intensity of the austenite (B2) peak was larger than the martensite (B19') peak. The existence of highly organized atomic arrangements of cubic austenite has been indicated by the high-intensity austenite (B2) signal and other studies [25][26][27] have documented a similar tendency. There was an increase in the intensity of the orthorhombic martensite (B19) phase following a rise in the Cu content to 15 at.% as against a decrease in the cubic austenite (B2) phase.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 58%

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy

Radhamani

Muralidharan

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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This research is related to the investigation of the influence of copper additions on phase transformation, microstructure and mechanical characterization of equiatomic NiTi shape-memory alloys. A typical vacuum arc melting furnace was used in the preparation of Ni50-xTi50Cux (x = 2, 5, 10, and 15 at.%) shape-memory alloys. The crystalline phase formation and phase transformation temperature were studied using X-ray diffraction and a differential scanning calorimeter. The morphology and chemical composition of the annealed samples were investigated using a field emission scanning electron microscope and energy-dispersive X-ray spectrometer analysis. The Vickers microhardness test was utilized in the analysis of the homogeneity of the alloy. The experimental results obtained from X-ray diffraction confirmed the coexistence of austenite and martensite phases along with the presence of a Ti2Ni and minor rutile phases. The crystalline sizes of the alloys were in the range of 42 to 78nm. An energy-dispersive spectrometer validated the distinct phases and precipitates in the alloys. The size and dispersion of the secondary phase in the alloy showed a significant influence on the increased hardness from 407HV to 470HV. The following NiTiCu alloy compositions were employed for low-temperature applications since their transition temperatures were below 100°C.

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Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 58%

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy

Radhamani

Muralidharan

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Most common methods to fabricating shape memory alloys is arc melting, induction melting, melt-spinning, plasma melting, injection molding, thermal explosion combustion, explosive shockwave compression, severe plastic deformation, spark plasma sintering and extrusion [27]. Vacuum induction melting (VIM) with graphitic crucible is used extensively [28].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Heat Treatment on Microstructure and Mechanical Properties of 50 wt.% Ni-42.5 wt.% Ti-7.5 wt.% Cu Shape Memory Alloy

Omrani¹,

Shokuhfar²

2019

Int J Metall Met Phys

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NiTi alloys have good shape memory properties that adding alloying elements such as Cu can help to have smaller temperature hysteresis, better thermoelasticity, smaller superelastic hysteresis, higher damping capacity, and superior fatigue properties. The present work addresses functional mechanical properties of 50 wt.% Ni-42.5 wt.% Ti-7.5 wt.%. We study how aging heat treatment affects the alloy microstructure and mechanical properties. The results exhibit that increasing the aging temperature tend to increase the size of precipitation due to high diffusion in high temperature. The evaluation of mechanical properties reveals that the samples that aged in high temperature has lower fracture strength while these samples shows higher fracture strain. Aging time also has an effect on properties where by increasing the time, the size and amount of precipitations increase due to sufficient time for diffusion. By increasing the time, the fracture strength increase until a critical point and after that the fracture strength reduces.

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“…Among them, near equiatomic NiTi alloy is one of the most interesting materials owing to their unparalleled shape memory and superelasticity demeanor, and good biocompatibility [1][2][3]. However, the Ni hypersensitivity and toxicity of Ni have been indicated in TiNi alloys [4].…”

Section: Introductionmentioning

confidence: 99%

Properties of Carbonitrided Layer Formed on TiNbSn Shape Memory Alloy

2014

International Conference on Innovative Engineering Technologies (ICIET’2014) Dec. 28-29, 2014 Bangkok (Thailand)

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Abstract-The aim of this study to improve the mechanical and tribological properties of TiNbSn shape memory alloy (SMA) by rf plasma carbonitriding for using in in a bio-medical implementation. The treatment process was proceed at low working gas pressure of 0.075 mbar in the nitrogen-acetylene gaseous mixture to produce a superficial carbonitrided layer. The rf inductively coupled were used to treat samples at different plasma processing power from 300 to 500 W and for a fixed time 15 minutes. The microstructure and properties such as mechanical and tribo-logical of the untreated and treated TiNbSn samples were inspected. The surface hardness is improved by rf plasma carbonitriding to a maximum of 491 HV for plasma-processing power of 400W, and the friction coefficient decrease to 0.463 for the sample treated at 400 W.

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Morphological and structural evaluation of nanocrystalline NiTiCu shape memory alloy prepared via mechanical alloying and annealing

Cited by 17 publications

References 12 publications

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy

Effect of Aging Heat Treatment on Microstructure and Mechanical Properties of 50 wt.% Ni-42.5 wt.% Ti-7.5 wt.% Cu Shape Memory Alloy

Properties of Carbonitrided Layer Formed on TiNbSn Shape Memory Alloy

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Morphological and structural evaluation of nanocrystalline NiTiCu shape memory alloy prepared via mechanical alloying and annealing

Cited by 17 publications

References 12 publications

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni50-xTi50Cux shape-memory alloy

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni50-xTi50Cux shape-memory alloy

Effect of Aging Heat Treatment on Microstructure and Mechanical Properties of 50 wt.% Ni-42.5 wt.% Ti-7.5 wt.% Cu Shape Memory Alloy

Properties of Carbonitrided Layer Formed on TiNbSn Shape Memory Alloy

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The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy

The effect of copper on phase transformation, microstructure and mechanical characterization of Ni_50-xTi₅₀Cu_x shape-memory alloy