Elastic modulus behavior in dual phase Cu-Al-Ni-Ti-(Mn) shape memory alloys

Inaki Hurtado; Jan VanHumbeeck; Chi-Mei Moo

doi:10.1117/12.209791

22 May 1995 Elastic modulus behavior in dual phase Cu-Al-Ni-Ti-(Mn) shape memory alloys

Inaki Hurtado, Jan VanHumbeeck, Chi-Mei Moo

Proceedings Volume 2441, Smart Structures and Materials 1995: Smart Materials; (1995) https://doi.org/10.1117/12.209791
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

Shape memory alloys are an example of active materials which are used as sensor-actuator materials. Their performance is related to a (thermoelastic) martensitic transformation. At present, new compositions other than the already industrial, Ni-Ti and Cu-Zn-Al, are being developed for higher temperature applications (370 to 470 K). Among them, the Cu-Al-Ni system, with the addition of other elements to improve its mechanical properties, is being explored. For this alloy the martensitic transformation takes place between a high temperature cubic structure, (beta) -phase, and a low temperature structure with lower symmetry, the martensite phase. The addition of Ti produces the precipitation of second phase particles, (Cu,Ni)₂AlTi, which have a structure and lattice parameter close to the one of the (beta) -phase. The presence of the second phase substantially modifies the elastic modulus and damping characteristic of the phases involved in the martensitic transformation. Especially important is the modification of the E-modulus values of respectively the martensite and (beta) -phase below and above the transformation temperatures: for a precipitate-free material their values are similar whereas the presence of precipitates produce an important increase in the (beta) -phase modulus value which nearly doubles that of the martensite. In the present communication this behavior is described as a function of the precipitate size distribution and coherency degree with the matrix. Some insight of the microstructural mechanisms leading to this behavior are discussed. This large modulus change could be applied in active modal modification techniques.

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Inaki Hurtado, Jan VanHumbeeck, and Chi-Mei Moo "Elastic modulus behavior in dual phase Cu-Al-Ni-Ti-(Mn) shape memory alloys", Proc. SPIE 2441, Smart Structures and Materials 1995: Smart Materials, (22 May 1995); https://doi.org/10.1117/12.209791

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KEYWORDS

Heat treatments

Interfaces

Particles

Shape memory alloys

Temperature metrology

Manganese

Transmission electron microscopy

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