Abstract
Precipitation sequences in a Cu-14 pct Al-4 pct Ni (wt pct) shape memory alloy were studied by means of transmission electron diffraction and microscopy as well as X-ray microanalysis techniques. On aging thin foil specimens up to 550 °C in the electron microscope, an as-quenched sample having a mixture of 2H-type and D03-type metastable structures transformed to the stable simple cubic γ2 phase at or above 450 °C. The remaining matrix either showed precipitates of the fcc α-phase on prolonged annealing at 500 to 550 °C for a longer period, or transformed to martensite on cooling below theM s temperature (~150 °C).
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Singh, J., Chen, H. & Wayman, C.M. Transformation squence in a Cu-Al-Ni shape memory alloy at elevated temperatures. Metall Trans A 17, 65–72 (1986). https://doi.org/10.1007/BF02644443
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DOI: https://doi.org/10.1007/BF02644443