Influence of the sintering method on microstructure and microhardness of AlCuNiSnZn-based high-entropy brasses and bronzes obtained by powder metallurgy

L. D. Laguna-Zubia, C. G. Garay-Reyes*, P. A. Guerrero-Seañez, M. A. Ruiz-Esparza-Rodríguez, J. M. Mendoza-Duarte, I. Estrada-Guel, Sergio Gonzalez Sanchez, A. Martinez-Garcia, R. Martínez-Sánchez*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The present report focused on synthesizing and characterizing a series of AlCuNiSnZn alloys obtained by powder metallurgy as a new family of high-entropy brasses and bronzes. The (AlCuNi)80Sn10Zn10 and (AlCuNi)70Sn15Zn15 alloys were obtained by mechanical alloying and sintering, evaluating two sintered methods: high-frequency induction heat and conventional. After 10 h of mechanical alloying, the elemental powder mixture formed solid solutions of face-centered cubic (FCC-α) and body-centered cubic (BCC-β) phases. However, the solid solutions, after sintering, were decomposed into a mixture of γ Ni2Zn11, AlNi, and Cu2Ni3Sn3 phases. The (AlCuNi)80Sn10Zn10 system sintered by high-frequency induction heat exhibits a microhardness value of ∼501 HV±17, while that obtained by the conventional method was ∼320 ± 21 HV. The results showed that it is convenient to maintain the BCC/FCC solid solutions after sintering due to their stability and properties. In addition, it is necessary to design alloys with lower values of ΔHmix to improve the microhardness.

Original languageEnglish
Article number113006
Number of pages6
JournalVacuum
Volume222
Early online date20 Jan 2024
DOIs
Publication statusE-pub ahead of print - 20 Jan 2024

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