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G. VITEL1, A. L. PARASCHIV2, M. G. SURU2, N. CIMPOEȘU2, L.-G. BUJOREANU2,*
A normalized hot forged Cu-15Zn-6Al (mass. %) shape memory alloy (SMA) was subjected to tempering heat treatments meant to enhance the reversion to parent phase (austenite) of thermally induced martensite. By means of differential scanning calorimetry (DSC) the reversibility of martensitic transformation was verified during constant-rate heating-cooling cycles. The results have showed that 373 K- tempering destabilized martensite and enabled its reversion at lower temperatures, on heating. Conversely, 473 K-tempering caused the disappearance of martensite phase. The structural features, observed both by optical microscopy (OM) and by scanning electron microscopy (SEM), at the phase transformation product obtained after 473 K-tempering suggest the presence transitory bainite, since its nucleation is diffusionless while its growth is diffusion controlled, which could explain the lack of reversibility..
Cu-Zn-Al shape memory alloy, Martensite, Thermal cycle, Differential scanning calorimetry, Heat treatment.
G. VITEL, A. L. PARASCHIV, M. G. SURU, N. CIMPOEȘU, L.-G. BUJOREANU, Tempering effects in a normalized hot forged Cu-Zn-Al shape memory alloy, Optoelectronics and Advanced Materials - Rapid Communications, 6, 1-2, January-February 2012, pp.339-342 (2012).
Submitted at: June 11, 2011
Accepted at: Feb. 20, 2012
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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