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Open AccessArticle

Influence of B and Nb Additions and Heat Treatments on the Mechanical Properties of Cu-Ni-Co-Cr-Si Alloy for High Pressure Die Casting Applications

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Facultad de Ingeniería Mecánica y Eléctrica (FIME), Universidad Autónoma de Nuevo León, Av. Universidad S/N, San Nicolás de los Garza, Nuevo León 66450, Mexico
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Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Carretera a Salinas Victoria km. 2.3, Apodaca C.P., Nuevo León 66600, Mexico
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 602; https://doi.org/10.3390/met10050602
Received: 27 March 2020 / Revised: 20 April 2020 / Accepted: 30 April 2020 / Published: 6 May 2020
(This article belongs to the Special Issue Advances in Metal Casting Technology)
During the high pressure die casting process (HPDC), it is necessary to develop new designs and alloys for the copper plungers. In this research, two alloys Cu-9Ni-1Co-1.6Cr-2Si-1.3Fe-0.25B wt.% (A1) and Cu-9Ni-1Co-1.6Cr-2Si-0.1Fe-0.2Nb wt.% (A2) under different heat treatments (HT) were studied. Optical microscopy technique was applied to reveal the regions of dendritic morphology, also lower Secondary Dendrite Arm Spacing (SDAS); and different grain orientations. The results reveal that the solidification sequence is primary Cu dendrites and secondary intermetallics; heat treatments increase the redistribution of alloying elements in the interdendritic regions. During the heat treatments, some precipitates were found in the grain boundary after aging heat treatments for both alloys, which were determined by X-ray diffraction. Hardness test HRB presented a decrease with the solution heat treatment and an increase with the aging heat treatments proposed for both alloys. Finally, the wear resistances for both alloys were compared with a commercial alloy C17530, with decreased A1 with B additions having the best result in the as-cast condition 4.07 × 10−4 mm3/Nm, while for A2 with Nb additions wear resistance increased, with the best result in the one with aging heat treatment 1.69 × 10−4 mm3/Nm while for the C17530 alloy this was 2.74 × 10−4 mm3/Nm. View Full-Text
Keywords: Cu-Ni-Co-Cr-Si alloy; grain refiners; heat treatments; microstructure; dendritic coherence; precipitation hardening; wear on copper alloys Cu-Ni-Co-Cr-Si alloy; grain refiners; heat treatments; microstructure; dendritic coherence; precipitation hardening; wear on copper alloys
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MDPI and ACS Style

Avila-Salgado, D.A.; Juárez-Hernández, A.; Medina-Ortíz, F.; Lara Banda, M.; Hernández-Rodríguez, M.A.L. Influence of B and Nb Additions and Heat Treatments on the Mechanical Properties of Cu-Ni-Co-Cr-Si Alloy for High Pressure Die Casting Applications. Metals 2020, 10, 602.

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