Effect of Fe on Phase Transformation of Low Temperature Cu-Al-Mn Memory Alloy

Abstract:

The influence of Fe addition on the phase transformation and the microstructure of Cu₆₇Al_27-XMn₆Fe_X 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 Cu₆₇Al_27-XMn₆Fe_X alloys consists of Cu₃Al matrix, γ₂ (Cu₉Al₄) and α (Cu) phases. Fe element was distributed in precipitates and matrix.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 474-479
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.474
• Online since: June 2011
• Authors: Kun Peng Zhu, Ning Hu, Fu Shun Liu
• Keywords: CuAlMnFe, Martensitic Transformation (MT), Microstructure, Shape Memory Alloy Actuator

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