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Study of the stability and decomposition process of the β phase in Cu–Al–Ni shape memory alloys

✍ Scribed by J.I. Pérez-Landazábal; V. Recarte; V. Sánchez-Alarcos; M.L. Nó; J. San Juan

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
340 KB
Volume
438-440
Category
Article
ISSN
0921-5093

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✦ Synopsis

The influence of precipitation processes on the characteristics of the martensitic transformation in two Cu-Al-Ni shape memory alloys processed by powder metallurgy has been analyzed. The Cu-14.37Al-4.2Ni (wt.%) alloy with a hypereutectoid composition undergoes a lowtemperature martensitic transformation, M s < 100 • C. On the other hand, the Cu-14.15Al-3.25Ni (wt.%) near eutectoid composition undergoes a high-temperature martensitic transformation, M s > 110 • C. The evolution of the kind of induced martensite, hysteresis and transformation temperatures as a function of thermal history has been studied by differential scanning calorimetry. Also, resonant ultrasound spectroscopy allows changes to be monitored of elastic constants during the evolution of the microstructure. Finally, a comparative analysis of the behavior of both alloys has been made.

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