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New calorimetric-structural aspects of temperature memory effect in hot rolled Cu-Zn-Al SMAs

G. VITEL1, A. L. PARASCHIV2, M. G. SURU2, N. CIMPOESU2, L.-G. BUJOREANU2,*

Affiliation

  1. “Axinte Uricariul” School, 707425 Scânteia, jud. Iaşi, Romania
  2. The “Gheorghe Asachi” Technical University from Iaşi, Bd. D. Mangeron 67, 700050 Iaşi, Romania

Abstract

Temperature memory effect (TME) is usually manifested by a kinetic stop during reverse transformation of thermally induced martensite to parent phase, after performing an incomplete heating in the previous thermal cycle, applied to a shape memory alloy (SMA). Technically TME causes the splitting of the endothermic peak corresponding to martensite reversion, on differential scanning calorimetry (DSC) thermograms. The present paper illustrates new manifestations of TME on DSC thermographs of hot rolled Cu-Zn-Al SMAs and discusses the accompanying structural changes observed by optical and scanning electron microscopy..

Keywords

Temperature effect, Cu-Zn-Al shape memory alloy, Martensite population, Differential scanning calorimetry, Microstructure.

Citation

G. VITEL, A. L. PARASCHIV, M. G. SURU, N. CIMPOESU, L.-G. BUJOREANU, New calorimetric-structural aspects of temperature memory effect in hot rolled Cu-Zn-Al SMAs, Optoelectronics and Advanced Materials - Rapid Communications, 5, 8, August 2011, pp.858-862 (2011).

Submitted at: July 17, 2011

Accepted at: Aug. 10, 2011