Effect of Fe on Phase Transformation of Low Temperature Cu-Al-Mn Memory Alloy
The influence of Fe addition on the phase transformation and the microstructure of Cu67Al27-XMn6FeX shape memory alloys are investigated by means of electrical resistivity, X-ray diffraction, scanning electron microscopy and microhardness test. It was shown that the Ms (Martensitic start transformation) temperature of the 850°C heat-treated alloy exhibit a sharp increase as Fe content increases, by comparison with the alloy without heat-treatment. For example, after 850°C heat-treatment, the Ms temperature of the alloy increases from 52K to 135K when Fe is added from 0 at.% to 1.5 at.%. The microstructure of as-homogenized Cu67Al27-XMn6FeX alloys consists of Cu3Al matrix, γ2 (Cu9Al4) and α (Cu) phases. Fe element was distributed in precipitates and matrix.
Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou
K. P. Zhu et al., "Effect of Fe on Phase Transformation of Low Temperature Cu-Al-Mn Memory Alloy", Materials Science Forum, Vol. 687, pp. 474-479, 2011