Influence of Ti additions on the martensitic phase transformation and mechanical properties of Cu–Al–Ni shape memory alloys

Saud, S. N.; Hamzah, Esah; Abubakar, T.; Zamri, Mohd; Tanemura, Masaki

doi:10.1007/s10973-014-3953-6

Cited by 67 publications

(32 citation statements)

References 37 publications

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“…Figure 6a-c displays the XRD of the aged alloys for 0.4, 0.7 and 1.0 mass% Ti additions, respectively. It can be noticed that the XRD patterns of the aged samples show almost the same patterns in the un-aged samples (as mentioned in the previous paper of this research [12] ) that can confirm the presence of the same phases in the microstructures of the aged samples. The only difference is that after the aging treatment, a slight shifting occurs that is associated with variations in the values of intensity.…”

Section: Microstructural Characteristicssupporting

confidence: 84%

“…4a-i and 5a-i. It is apparent that the aged microstructures obtained the same phases of the un-aged alloys [12] c 0 1 and b 0 1 , along with the precipitates. However, the microstructures changed in terms of morphologies, orientations, and volume fractions.…”

Section: Microstructural Characteristicsmentioning

confidence: 75%

“…The size and coherency of the precipitates affect the transition as well as the mechanical strength of the alloy [17]. In an earlier research paper [12], we discussed the effect of Ti additions on the microstructure and mechanical properties of Cu-Al-Ni SMA; thus, the next interesting step is a comprehensive study that investigates the effect of various amounts of aging time and temperature on the phase transition behavior of the modified alloys, as presented in this paper. The temperature range of study was designed based after a preliminary investigation by differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 96%

“…With nickel addition, while the eutectoid temperature remains at approximately 565°C, the material experiences eutectoid composition variation that affects the martensite microstructure [10]. Many factors are affected on the transition characteristics of the Cu-Al-Ni SMAs, e.g., adding alloying elements, applying aging treatment, and fabrication techniques [11][12][13][14][15]. Among the aforementioned factors, the aging treatment has been found to be the most significant process for enhancing the shape memory characteristics of the ternary Cu-Al-Ni alloys [11].…”

Section: Introductionmentioning

confidence: 99%

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X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

Saud

Hamzah

Abubakar

et al. 2015

J Therm Anal Calorim

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The present work aims to investigate the aging treatment effects on the microstructure, transition characteristics, and mechanical properties of Cu-Al-Ni-xTi shape memory alloys. The aging treatment of the homogenized and modified alloys of Cu-Al-Ni-xTi results in variations of the martensite morphology, volume fraction, and precipitate size. These variations in the features of precipitates have an obvious effect on transition behavior and mechanical properties. The transition temperatures are increased slightly with an increase in the aging time and temperatures; such increase is mainly attributed to changes in the c 0 1 and b 0 1 morphology and distribution, along with the precipitates. The thermodynamic parameters (DH and DS) tend to decrease with an increase in the aging time and temperatures. Moreover, the brittleness, low strength, and poor processability of Cu-Al-Ni alloys greatly limit their application. We attempted to improve the mechanical properties without losing the thermoelastic properties through the additions of Ti and appropriate aging treatments. The highest tensile strength and strain of 640 MPa and 4.3 % were obtained in alloy of Cu-Al-Ni-0.7 mass% Ti aged at 250°C for 24 h and 100°C for 48 h, respectively. The shape memory behavior of the alloys was studied using a specially designed machine. The strain recovery by shape memory effect of the alloys increases with an increase in the aging tomes and temperature, where the highest recovery (100 %) is obtained with the alloy of Cu-Al-Ni-0.7 mass% Ti after being aged at 250°C for 24 h.

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Section: Microstructural Characteristicssupporting

confidence: 84%

Section: Microstructural Characteristicsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

Saud

Hamzah

Abubakar

et al. 2015

J Therm Anal Calorim

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“…These were found to be most effective in improving the ductility of intermetallics. Moreover, Saud et al [33,34] have reported that the Ti additions to the Cu-Al-Ni shape memory alloy increase the ductility of this alloy from 1.65 to 3.2.…”

Section: Introductionmentioning

confidence: 99%

Morphology and structure effect of Ti additive on the solid-state reaction between Ni and Al powders during mechanical alloying

Chérif

Bachaga

Saurina

et al. 2016

Int J Adv Manuf Technol

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In this study, the mixtures of Ni, Al, and Ti elemental powders with nominal compositions Ni-40at.% Al and Ni30at.% Al-10at.% Ti were fabricated by mechanically alloying technique. The structural and morphological changes during high-energy mechanical alloying were investigated by X-ray diffraction and scanning electron microscopy. Differences in the kinetics of solid-state reactions which depend on the differences in the individual properties were found. The final products of the mechanical alloying process were nanocrystalline fcc-Ni(Al) and fcc-Ni(Al, Ti) solid solutions with a mean crystallite sizes in the range of a few nanometers. As a result, although the Ti addition was found to accelerate the formation of the solid solution in Ni-Al alloy, it results in a coarser microstructure.

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Fabrication and Damping Property of Porous Cu–Al–Ni Shape Memory Alloys Fabricated using Different Raw Materials

Chu

Hao

et al. 2023

Physica Status Solidi (a)

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Porous Cu‐Al‐Ni shape memory alloys (SMAs) were fabricated via powder metallurgy method by using Cu, Al, Ni powders and Cu‐Al‐Ni alloy powder as raw materials, respectively. It is found that the two kinds of specimens have similar macroscopic morphologies: connected pores are uniformly distributed in the Cu‐Al‐Ni matrix, forming a three‐dimensional network structure. By comparison, the specimen fabricated by using alloy powder has much finer microstructures than the specimens fabricated by using Cu, Al, Ni powders. After adding Ce element to the latter, the microstructure of the Cu‐Al‐Ni matrix was significantly refined because of the formation of Ce‐rich particles. Damping tests show that the latter has superior damping capacity than the former. With the increase of Ce content, the damping of the latter increases first and then decreases. When the Ce content reaches 0.05 wt.%, the highest damping can be achieved. Correlated mechanisms were discussed based on the microstructural observations.This article is protected by copyright. All rights reserved.

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Influence of Ti additions on the martensitic phase transformation and mechanical properties of Cu–Al–Ni shape memory alloys

Cited by 67 publications

References 37 publications

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

Morphology and structure effect of Ti additive on the solid-state reaction between Ni and Al powders during mechanical alloying

Fabrication and Damping Property of Porous Cu–Al–Ni Shape Memory Alloys Fabricated using Different Raw Materials

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