The Microstructure and the Phase Stability of a Cu–30at.%Al Alloy Obtained by Reactive Milling and Quenching

ESQUIVEL, M. R.; ZELAYA, E.; GIORDANA, M. F.

Metallography, Microstructure, and Analysis

Springer

Lugar: Londres; Año: 2020

2192-9262

The grain growth and the percentage [f1] of phases is analyzed in a Cu-30at%Al powder sample. Thephase stability of the quenched sample is analyzed by using different heat treatments. Theevolution of the different phases is studied by in-situ high temperature X-ray diffraction (XRD[f2] ), transmission electron microscopy (TEM) and differential scanning calorimetry(DSC). The interpretationof the obtained microstructure for the different heat treatmens is focused on theanalysis of the g2 phase. The grain size of the g2 phase, grows more than one order ofmagnitude when treated from room temperature[f3]  to 500 °C. However, the grain size does not change forisothermal treatments at temperatures values below 600 °C. Thisbehavior may be attributed to the pinning resulting from the presence of the nanometricgrains of the other phases. The fact that the grain size does not grow at a constanttemperature is a promising result for the technological applications as shapememory alloys.