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Effect of Quenching and Normalizing on the Microstructure and Magnetocaloric Effect of a Cu–11Al–9Zn Alloy with 6.5 wt % Ni–2.5 wt % Fe

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Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, col. Lomas 2a Sección, San Luis Potosí, San Luis Potosí 78210, Mexico
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Catedrático CONACYT, Consejo Nacional de Ciencia y Tecnología, Av. Insurgentes Sur, No. 1582, Col. Crédito Constructor, Del. Benito Juárez, Ciudad de México 03940, Mexico
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Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Industria Metalúrgica, No. 1062, Ramos Arizpe, Coahuila 25900, Mexico
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Universidad Autónoma de Ciudad Juárez, Av. del Charro Norte 450, Ciudad Juárez, Chihuahua 32310, Mexico
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Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Av. Chapultepec, San Luis Potosí, San Luis Potosí 1250, Mexico
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Author to whom correspondence should be addressed.
Magnetochemistry 2019, 5(3), 48; https://doi.org/10.3390/magnetochemistry5030048
Received: 21 July 2019 / Revised: 10 August 2019 / Accepted: 21 August 2019 / Published: 25 August 2019
First-order phase transitions (FOPT) and second-order phase transitions (SOPT) are commonly observed in Cu alloys containing lanthanide elements, due to their electronic configuration, and have an important effect on the optimization of their magnetocaloric effect (MCE). Alloys containing rare earths have the best magnetocaloric response; however, these elements are very expensive, due to their obtaining and processing methods. The present work reports the effect of using 3d transition elements and thermal treatments on the microstructure and MCE of Cu–11Al–9Zn alloys with 6.5 wt % Ni and 2.5 wt % Fe. It was found that thermal treatments of quenching and normalizing, as well as the use of Ni and Fe, have an important influence on both the resulting phases and MCE of the investigated alloy. MCE was calculated indirectly from the change in the magnetic entropy (–ΔSm) under isothermal conditions, using Maxwell´s relation; it was found that samples subjected to normalizing presented a higher magnetocaloric effect than samples with quenching, which was related to the greater disorder in the alloy, due to the coexistence of β1 + β phases. View Full-Text
Keywords: Cu–Al–Zn alloys; magnetocaloric effect; microstructure; heat treatments; 3d transition elements Cu–Al–Zn alloys; magnetocaloric effect; microstructure; heat treatments; 3d transition elements
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Castañeda, E.J.G.; Castro, R.E.B.; Briseño, A.C.; Arguijo, B.F.; Castillo, A.A.T.; Rodríguez, A.S.; Galindo, J.T.E.; Sánchez, S.A.P. Effect of Quenching and Normalizing on the Microstructure and Magnetocaloric Effect of a Cu–11Al–9Zn Alloy with 6.5 wt % Ni–2.5 wt % Fe. Magnetochemistry 2019, 5, 48.

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