Controlling of Transformation Temperatures of Cu-Al-Mn Shape Memory Alloys by Chemical Composition

Abstract

The CuAlMn shape memory alloys having various chemical compositions were prepared by arc melting method to control the phase transformation parameters. The phase transformation parameters and structural properties of the alloys were investigated by dierential scanning calorimetry and optic microscopy, respectively. The eects of the chemical composition on characteristic transformation temperatures, enthalpy and entropy values of CuAlMn ternary system were investigated. The characteristic transformation temperatures of austenite and martensite phase (As, A f , Ms, and M f) are increased with change in the chemical composition of the alloys. The average crystallite size for the alloys was calculated to determine the eect of aluminum and manganese compositions on the transformation temperatures. The change in transformation temperatures indicates the same trend with change in crystallite size. The obtained results suggest that the phase transformation parameters of the CuAlMn alloys can be controlled by Al and Mn contents.

A Study of a Cryogenic CuAlMn Shape Memory Alloy

“…Moreover, Kožuh et al [33] pointed out that precipitation in CuAlMn produces a change in the chemical composition of the matrix. Indeed, it has been found that the CuAlMn alloy's phase transition temperatures are highly dependent on composition [34]. As a result, the bainite formation is responsible for the observed increase in phase transformation temperatures and the loss of the cryogenic feature.…”

Effect of Heat Treatment on Microstructure and Thermal Properties of Cu-based Shape Memory Ribbons

“…10 On the other hand, the Cu-based shape memory alloys are usually annealed in β-region at 800 or 900 °C to achieve preconditions for the formation of shape memory effect. 10,11 Canbay et al 12 mentioned that copper-based shape memory alloys…”