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Acoustic Emission as a Probe of the Kinetics of the Martensitic Transformation in a Shape Memory Alloy

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Fig. 1Schematic diagram of the experimental set-up used for AEmeasurements during cooling of the CuAlMn shape memory alloy: (1)specimen; (2) waveguide; (3) transducer; (4) pre-amplifier (60 dB); (5) AEanalyzing system; (6) thermocouple.
Fig. 2The values of (a) the AE power, (b) the transformation rate and (c)the volume fraction of martensite plotted against time during themartensitic transformation in the shape memory alloy.
Fig. 3The progress of the martensitic transformation in the SMA as afunction of undercooling: (a) the change in volume fraction; (b) thevolume fraction and (c) the volume fraction data plotted on a logarithmicscale
Fig. 6Observation of the change in microstructure during cooling of the SMA sample over a period of 30 s.

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