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Aging response and its effect on the functional properties of Cu–Al–Ni shape memory alloys

N. Suresh, U. Ramamurty

2008enshape memoryalloysagingdampingmechanical

Abstract

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The /H9252-phase aging response of Cu–Al–Ni single crystal shape memory alloys (SMAs) within the temperature range of 473–573 K has been investigated. Alloys in austenitic (Cu–14.1Al–4Ni wt.%, alloy A) and martensitic (Cu–13.4Al–4Ni wt.%, alloy M) conditions at room temperature were considered. Aged samples show presence of /H92521 ′ and /H92531 ′ martensites in both the alloys and formation of /H92532 precipitates in the alloy A. The differential scanning calorimetry (DSC) thermograms of the aged samples show increase in transformation temperatures as well as transformation hysteresis with aging. Dynamic mechanical analysis (DMA) was conducted on both the alloys to ascertain the role of precipitates and martensitic transition on tan δ , which characterizes the damping behaviour of the material. With aging, a steady decrease in tan δ value was observed in both the alloys, which was attributed to the decrease in the number of interfaces per unit area with increasing aging temperature. Moreover, in alloy A, as the volume fraction of precipitate increases with aging, the movement of martensitic interfaces is restricted causing a decreased tan δ.

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@article{75000bcf-6fa9-4cac-aa78-25c5f2d8e874,
  title={Aging response and its effect on the functional properties of Cu–Al–Ni shape memory alloys},
  author={N. Suresh and U. Ramamurty},
  year={2008},
  language={en}
}
TY  - JOUR
TI  - Aging response and its effect on the functional properties of Cu–Al–Ni shape memory alloys
AU  - N. Suresh
AU  - U. Ramamurty
PY  - 2008
LA  - en
ER  -

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