Influence of quaternary alloying additions on transformation temperatures and shape memory properties of Cu–Al–Mn shape memory alloy

Mallik, U.S.; Sampath, V.

doi:10.1016/j.jallcom.2008.01.128

Cited by 98 publications

(40 citation statements)

References 12 publications

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“…The temperature ranges overlap in most of the cases. Significantly high transformation temperatures have been recorded in Cu-Al-Mn alloys than conventionally reported [8,20] except with the addition of Mg in which case no distinct peaks have been recorded which could be designated to the martensitic-austenite transformations. The endoscopic transformation observed in the case of A-Mg is probably due to some other phase transformations; but these cannot be considered as martensitic-austenite transformations as the peak in the cooling cycle has been recorded at a higher temperature as compared to the peak in the heating cycle.…”

Section: Figure 2: Xrd Pattern Of Quenched Samplesmentioning

confidence: 76%

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Changes in the properties of Cu-Al-Mn shape memory alloy due to quaternary addition of different elements

et al. 2015

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Advantages of Cu based shape memory alloy include amongst other features, high transformation temperature, low cost of production, ease in manufacturing processes and ability to vary the achieved properties through alloying additions. It has been often reported that these alloys are very sensitive to the alloying additions in terms of properties achieved and phase precipitation necessary for development of shape memory properties. This behaviour in Cu based shape memory alloys i.e. being very sensitive to its constituents can be used positively to design alloys with pre set properties if the alloying additions and their percentages are properly controlled.In an attempt to understand the effect of different alloying additions, 2% of different elements [Zn, Si, Mg & Cr] were added to a known Cu-based shape memory alloy [Cu-12.5 wt% of Al-5 wt % of Mn]. The objective was to ascertain changes or improvements achieved due to the additions in terms of microstructural changes, hardness, phase precipitation and transformation temperatures. Attempts have been made to analyze the changes in properties achieved in the base Cu-Al-Mn alloys due to the quaternary additions. Grain structure with α+β phases, which is a pre requisite for martensite formation on quenching is seen in all the alloys indicating that all the alloys have potential to exhibit the shape memory behaviour. The martensite formation with different morphologies is observed in the quenched samples however. XRD results have identified the precipitated phases to be the martensitic phases. The DSC results indicate clear transformation peaks in most of the samples with significantly high transformation temperatures. The findings confirm the variation in properties achieved due to different additions and improvements achieved in terms of higher transformation temperatures and martensite formation due to the alloying additions. An attempt has been made to understand the findings.

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Section: Figure 2: Xrd Pattern Of Quenched Samplesmentioning

confidence: 76%

“…Among the Cu based shape memory alloys mostly investigated, the Cu-Al-Ni [1][2][3][4][5][6][7], Cu-Al-Zn [8][9][10][11][12] and Cu-Al-Mn [13][14][15][16][17][18][19][20][21] alloys have been studied extensively. But most Cu-Al-Ni and Cu-Zn-Al polycrystalline shape memory alloys are brittle and cannot therefore be cold worked.…”

Section: Introductionmentioning

confidence: 99%

Changes in the properties of Cu-Al-Mn shape memory alloy due to quaternary addition of different elements

et al. 2015

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“…Considering that cooling was interrupted at room temperature (RT), it may be assumed that direct martensitic transformation did not occur, since critical temperature M s would be located in cryogenic domain, as an effect of water quenching, being additionally depressed by Fe addition [16]. For this reason it is assumed that, during first heating, the amount of Cu-rich increased thus removing Cu from the matrix which subsequently experienced an order-disorder transition.…”

Section: Thermally Induced Phase Transitionsmentioning

confidence: 99%

Particularities of phase transitions in thermomechanically processed Cu-Al-Mn shape memory alloys

Stanciu

Bujoreanu

Comaneci

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. The thermally and stress induced phase transitions occurring in a Cu-Al-Mn Shape Memory Alloy (SMA) have been investigated by means of thermal analysis techniques, tensile testing and microscopic observations. On heating a hot rolled solution annealed Cu-Al-Mn SMA, up to 873 K, two phase transformations, related to equilibrium phase precipitation and to 2-step order-disorder transition, respectively, were revealed by Differential Scanning Calorimetry (DSC). During tensile testing, the Cu-Al-Mn SMA under study experienced almost complete superelasticity, after five mechanical training cycles, as well as good ductility and tensile resistance. On trained specimens the formation of stress induced martensite was revealed by optical microscopy (OM) observations. The reversion to austenite of stress induced martensite was accompanied by relatively large increases of elastic modulus and internal friction, determined on Dynamic Mechanical Analyzer (DMA) and by marked variations of relative elongation, thermal expansion coefficient and elongation rate, determined by dilatometry. Since it is a two step transition, it was associated with the two morphologies of stress induced martensite observed by Scanning Electron Microscopy (SEM).

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“…Cu-Al-Be alloys show good strain recovery and shape memory effects. Microstructure of as-cast specimens shows austenitic microstructure and after quenching same specimens shows completely lath martensitic microstructure [1][2][3][4].…”

Section: Introductionmentioning

confidence: 95%

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

Al-Haidary¹,

Mustafa²,

Hamza³

2017

J Material Sci Eng

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Cu-13Al-0.545Be shape memory alloy are heat treatment at different temperature and time. The microstructure of alloy after heat treatment at 850°C, 650°C and aging at 150°C ,450°C and 550°C for 2, 4 and 6 h study by optical microscope and X-ray diffraction. Bending test is use to show effect of heat treatment on super-elastic and shape memory effect.Micro hardness test used to show effect of heat treatment on micro hardness .shape memory effect increase at heat treatment 650°C and aging at 150°C, while at 450°C and 550°C will decrease because precipitate formation rate rises with increase in temperature and time. The hardness and precipitates in the alloy increases with increasing ageing duration. Higher ageing temperature avoids the imperfection by moving and filling the empty space thereby hardens the alloy.

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Influence of quaternary alloying additions on transformation temperatures and shape memory properties of Cu–Al–Mn shape memory alloy

Cited by 98 publications

References 12 publications

Changes in the properties of Cu-Al-Mn shape memory alloy due to quaternary addition of different elements

Changes in the properties of Cu-Al-Mn shape memory alloy due to quaternary addition of different elements

Particularities of phase transitions in thermomechanically processed Cu-Al-Mn shape memory alloys

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

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