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Effect of Varying Al/Mn Ratio on Phase Transformation in Cu–Al–Mn Shape Memory Alloys

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Abstract

In the present study, an attempt has been made to study the effect of the proportion of the main alloying constituents in a Cu–Al–Mn alloy, which is a known shape memory material. Four compositions of the alloy with varying ratios of Al:Mn, varying from 1 to 4 [added to copper], were synthesized using the liquid metallurgy route. After appropriate heat treatment to induce shape memory behaviour, they were studied for microstructure, X-ray diffraction, hardness and transformation temperature in an attempt to understand the effect of the varying ratios of the major alloying constituents on the properties mentioned. With an increase in the Al:Mn ratio, increase in grain size as well as cast hardness were observed. On the other hand, an increase in percentage decrease in hardness was observed with increase in Al:Mn ratio. Increase in Al:Mn ratio also favoured formation of martensitic structure with less amount of retained austenite.

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Acknowledgments

The authors are thankful to CSIR, New Delhi for sponsoring the project on ‘Design and development of thermo-responsive and magnetic shape memory materials and devices for engineering applications’ under its 12th Five Year Plan to CSIR-AMPRI Bhopal under which the related activities were carried out; a part of the findings have been reported in the present paper. Authors acknowledge with gratitude the contribution of Dr. V. Sampath, Professor, Metallurgical Engineering Department, IIT Madras, Chennai for extending the melting facilities at his disposal for synthesizing some of the alloys which have been dealt with in this paper.

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Authors and Affiliations

  1. CSIR-Advanced Materials and Processes Research Institute (AMPRI), Bhopal, 462026, India

    Ashish Kumar Jain, Shahadat Hussain, Pravir Kumar, Abhishek Pandey & Rupa Dasgupta

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  1. Ashish Kumar Jain
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  2. Shahadat Hussain
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  3. Pravir Kumar
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  4. Abhishek Pandey
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  5. Rupa Dasgupta
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Correspondence to Rupa Dasgupta.

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Jain, A.K., Hussain, S., Kumar, P. et al. Effect of Varying Al/Mn Ratio on Phase Transformation in Cu–Al–Mn Shape Memory Alloys. Trans Indian Inst Met 69, 1289–1295 (2016). https://doi.org/10.1007/s12666-015-0689-3

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  • DOI: https://doi.org/10.1007/s12666-015-0689-3

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