Effect of alloying on microstructure and shape memory characteristics of Cu–Al–Mn shape memory alloys

Mallik, U.S.; Sampath, V.

doi:10.1016/j.msea.2006.10.212

Cited by 42 publications

(15 citation statements)

References 5 publications

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“…This shows that the addition of iron has brought a change in the morphology of the martensite formed. In the alloys S7 [ Fig.6 (b)] and S8 [ Fig.6(c)] with higher iron content, a mixture of coarse J 1 c martensite and thin E 1 c martensite are formed [10][11][12].…”

Section: Resultsmentioning

confidence: 99%

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Raju

Sampath

2011

Trans Indian Inst Met

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Copper based shape memory alloys have received much focus in recent times because of their good ductility, ease of production and processing and low cost. Earlier investigations have shown that ductility and other mechanical properties of the Cu-Al based shape memory alloys can significantly be improved by adding ternary elements such as Ni and Mn. While Cu-Al-Ni shape memory alloys have better thermal stability and higher operating temperatures, their practical applications are limited because of their poor workability. Cu-Al-Mn shape memory alloys on the other hand, have good ductility and workability, but their operating temperatures are lower. A similar approach is followed in Ni-Al alloys to overcome their brittleness by the addition of Fe. There is paucity of literature on the role of ternary addition of Fe to Cu-Al shape memory alloys. In the present work, therefore, the effect of aluminium and iron on the transformation temperatures has been studied. As the aluminium content increases the transformation temperatures decrease, while the ternary addition of Fe increases the transformation temperatures. The results are presented and discussed in detail in the paper.

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Section: Resultsmentioning

confidence: 99%

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Raju

Sampath

2011

Trans Indian Inst Met

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“…At the same time, they found that an increase in the amount of manganese stabilizes the martensite and improves the super-elasticity of alloys. In other studies [12,13], the same authors compared different compositions of the Cu-Al-Mn system, concluding that the damping capacity of alloys increases when increasing the aluminum content, and when keeping the Cu/Mn ratio constant. They also observed that the damping capacity decreases with an increase in the manganese content, when the amount of aluminum is more or less constant.…”

Section: Introductionmentioning

confidence: 96%

“…However, the former is very expensive and the latter is not ductile enough to be laminated in thin sheets, as is required by the target application. To overcome those problems, the Cu 85.35 Al 11.65 Mn 3 composition, which exhibits higher damping levels compared to other similar compositions, was investigated for the hybridization of composites [12,13]. Studies were also conducted on the possibility to fabricate thin sheets (with a thickness amounting to 0.3-0.4 mm) according to the thickness required by the hybridization technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Characterization of High Damping Martensitic CuAlMn Sheets

et al. 2020

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This paper deals with the experimental and numerical characterization of a high damping CuAlMn sheet with a martensitic micro-structure at ambient temperature. A Cu-Al-Mn shape memory alloy containing 11.65 wt.% of Al and 3 wt.% of Mn, was cast and hot rolled to the thickness of 0.4–0.3 mm. Transformation temperatures, micro-structure and mechanical properties were studied. Effects of the heat treatment on damping were investigated, identifying the proper heat treatment to obtain a higher damping. Having to model the amplitude dependent damping of the material investigated, a material model was developed based of cyclic behavior under traction-compression load. The model was validated with experiments on the non-linear damping of the material.

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“…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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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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Effect of alloying on microstructure and shape memory characteristics of Cu–Al–Mn shape memory alloys

Cited by 42 publications

References 5 publications

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Experimental and Numerical Characterization of High Damping Martensitic CuAlMn Sheets

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

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