Dependence of the martensitic transformation characteristics on concentration in Cu–Al–Ni shape memory alloys

Recarte, V.; Pérez-Sáez, R.B.; Bocanegra, E.H.; Nó, M.L.; Juan, J. San

doi:10.1016/s0921-5093(99)00302-0

Cited by 95 publications

(54 citation statements)

References 11 publications

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“…The twin peaks give an indication of transformation from E 1 o J 1 c on high temperature side, but a split in the peak in forward transformation is not observed because of the broadening of the peak. It also shows, that as the iron content increases there is an increase in the M s and A s temperatures, though to a lesser extent [4][5][6].…”

Section: Resultsmentioning

confidence: 81%

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: 81%

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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“…This shows that the sample used in the present study have the composition nearly equal to the mixing ratio of the starting materials, because M s of a bulk sample with the designing composition is around 60°C. 10,11) In contrast to the as-quenched sample, most of diffraction peaks for the aged sample is due to the 2H martensite structure as shown in Fig. 2(b).…”

Section: Resultsmentioning

confidence: 95%

The Effects of Aging on the Degree of Order in Cu-Al-Ni Shape Memory Alloys

2016

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The fractions of Al atoms at three kinds of crystallographic sites were determined in a Cu-15.5Al-4.0Ni (mass%) alloy before and after aging using powder X-ray analysis in order to clarify the effect of aging on the martensite start temperature, M s . The ordering between first nearest neighbors (the B2 ordering) was almost finished even just after quenching, but the ordering between second nearest neighbors (the L2 1 ordering) was incomplete. The B2 type ordering occurs in advance of the L2 1 ordering in Cu-Al-Ni alloys as well as in Cu-Al-Zn alloys. The degree of L2 1 order increases from 0.699 to 0.844 during aging at 200°C for an hour. The increase in M s during the aging is attributed to the L2 1 ordering in Cu-Al-Ni alloys.

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“…; ->• /3/ (220 K/ 1 wt.% of Al) and /? ; -» yi' (180 K/1 wt.% of Al) transformations shift upward with decreasing Al content but not equally [11,12]. The difference in the shift rates for both transformations explains why the /3/' martensite forms in alloys with lower Al content' (below 13,6 wt.%), while the yi' phase occurs in alloys having higher Al content upon stress free cooling.…”

Section: Discussionmentioning

confidence: 99%

Martensitic transformations of Cu-Al-Ni single crystals in tension/compression

2001

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Abstract. Cu-AI-Ni alloys, similarly as other Cu-base shape memory alloys, transform into more martensitic structures c^' (6R), Pi' (18R) and y x ' (2H), depending on the temperature, stress, load axis orientation, sense of loading and composition. The transformation stress-temperature conditions at which individual transitions take place are beneficially represented in so called non-equilibrium stress-temperature phase diagrams. On the basis of the 363K) and comparison with our previous results obtained on alloys with higher Al content (T 0 <263K).

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Dependence of the martensitic transformation characteristics on concentration in Cu–Al–Ni shape memory alloys

Cited by 95 publications

References 11 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

The Effects of Aging on the Degree of Order in Cu-Al-Ni Shape Memory Alloys

Martensitic transformations of Cu-Al-Ni single crystals in tension/compression

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