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Acta Metall Sin  1987, Vol. 23 Issue (6): 464-469    DOI:
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HIGH VOLTAGE TEM OBSERVATION OF THERMOELASTIC MARTENSITIC TRANSFORMATION IN A Cu-Zn-Al ALLOY
by DENG Yongrui (Beijing University of Iron and Steel Technology); ANSELL; G. S.. (Rensselaer Polytechnic Institute; USA) (Manuscript received 3 December; 1985; revised manuscript 28 May; 1985)
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by DENG Yongrui (Beijing University of Iron and Steel Technology); ANSELL; G. S.. (Rensselaer Polytechnic Institute; USA) (Manuscript received 3 December; 1985; revised manuscript 28 May; 1985). HIGH VOLTAGE TEM OBSERVATION OF THERMOELASTIC MARTENSITIC TRANSFORMATION IN A Cu-Zn-Al ALLOY. Acta Metall Sin, 1987, 23(6): 464-469.

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Abstract  The martensitic transformation in Cu-29%Zn-3%Al alloy occurs thermoelastically. High voltage TEM observation shows that the parent phase belongs to DO_3 and martensite belongs to 18R in structure. Fine structures of tiny packages with a traverse size of~10nm in martensite plates have been seen at the thicker part of the sample. The boundary between β' and M at the thinner part was flat or sawtooth-like composed parallel dislocation lines: Although the reversibility of the transformation in TEM samples has been observed under an optical microscope, only the β'→M transformation observed on TEM. Probably, the thickness of thiner part of the foil is too small to store enough elastic energy which is the driving force of the reverse transformation.
Received:  18 June 1987     
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