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

A.Salinas Rodríguez¹  S.A. Palomares Sánchez²  A.A. Torres Castillo³  A.Contreras Briseño³  E.J. Gutiérrez Castañeda³  R.E. Barreras Castro³  B.Fernández Arguijo³  J.T. Elizalde Galindo⁴ 

[1] Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Industria Metalúrgica, No. 1062, Ramos Arizpe, Coahuila 25900, Mexico;Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Av. Chapultepec, San Luis Potosí, San Luis Potosí 1250, Mexico;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;Universidad Autónoma de Ciudad Juárez, Av. del Charro Norte 450, Ciudad Juárez, Chihuahua 32310, Mexico;

关键词: Cu–Al–Zn alloys;    magnetocaloric effect;    microstructure;    heat treatments;    3d transition elements;   

DOI  :  10.3390/magnetochemistry5030048

来源: DOAJ

【 摘 要 】

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 (−ΔS_m) 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.

【 授权许可】

Unknown