A high-working-temperature CuAlMnZr shape memory alloy |
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| Authors: | J. Chen Z. Li Y.Y. Zhao |
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| Affiliation: | aSchool of Materials Science and Engineering, Central South University, Lushan South Road, Changsha 410083, China;bKey Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China;cDepartment of Engineering, University of Liverpool, Liverpool L69 3GH, UK |
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| Abstract: | The martensitic structure in the air-cooled Cu–11.91Al–2.48Mn–0.1Zr (wt%) alloy and its variation upon heating has been studied by X-ray diffraction and TEM. The forward and reverse thermoelastic transformation behavior has been studied by voltage measurement. The shape memory ratio of the alloy aged at 150 °C (in martensite state) for different times up to 100 h, or heated to different temperatures up to 620 °C followed by air cooling, has been measured. The air-cooled state of the alloy has a monoclinic martensitic structure M18R, which closely matches the N18R structure. This structure remains almost unchanged when the alloy is heated to 400 °C. When the alloy is heated to 620 °C, only a small amount of γ2 phase precipitates and a shape memory ratio of 92% is achieved. When the alloy is aged at 150 °C for 100 h, a shape memory ratio of 97.2% is achieved. |
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| Keywords: | Metals and alloys Shape memory Phase transitions Microstructure |
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