Effect of dopant and heat treatment on the microstructure and mechanical properties of Nickel-Aluminum bronze.

The effect of dopant and heat treatment on the microstructure and mechanical properties of Nickel-aluminum bronze (Cu-10%Al-5%Ni-5%Fe-x%Mo) were extensively investigated. The cast samples were heat treated through different processes, including solutionizing, quenching, and aging; their microstructures were examined using an optical microscope, scanning electron microscopy and energy dispersive spectroscopy analysis and their mechanical properties determined. The microstructure of the as-cast samples consisted of Cu-rich ‘α-phase, ‘κ-phases and small volume fraction of β'-phase while solutionizing transformed the β'-phase to a homogenous β-phase, α, and κ phases. Quenching transformed all β phase to β'-phase, however, aging the alloy precipitated fine dispersive strengthening κ-phases from the quenched microstructure. The results of the mechanical tests showed that the aged samples had improved excellent mechanical properties compared to the as-cast samples. Compared to the base alloy, the tensile strength and hardness of the aged 2% Mo sample increased by 58% and 55%, respectively while the impact strength and elongation decreased by 27% and 22%, respectively. Similarly, the tensile strength and hardness of the aged 3% Mo sample increased by 44% and 49%, respectively, while the impact strength and % elongation decreased by 23.9% and 24.9%, respectively

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Synergistic effects of alloying elements and solid solution treatment on the impact energy, density and conductivity of Cu-3Si-3(Zn, Sn) alloys system

Abstract: The present study explored the synergistic effects of alloying elements and solid solution treatment on the impact energy, density, and conductivity of Cu-3Si-(Zn, Sn) alloys system. Response surface optimal design (RSOD) was utilized to design the alloys compositions. The Cu-3Si-3(Zn, Sn) alloys samples were cast employing stir-casting technique and machined to the required dimensions for the properties tests. The cast samples underwent solid solution at temperature of 900oC for 5 h. The microstructures of the cast samples were analyzed using optical metallurgical microscope (OM). The OM results revealed increased solid solution of zinc in the copper matrix after solid solution heat treatment. Conversely, tin showed increased segregation (coarse grains) in the copper matrix after heat treatment. This led to increase in electrical conductivity of Cu-3Si-3(Sn) ternary alloy in heat treated condition, unlike in Cu-3Si-3(Zn) where a decrease in electrical conductivity is obtained. Both Cu-3Si-3(Zn) and Cu-3Si-3(Sn) ternary alloys recorded increase in impact energy compared with the parent alloy (Cu-3Si). The impact energy of Cu-3Si-3(Sn) ternary alloy recorded a slight increase from 25.2 J to 25.9 J after heat treatment. Cu-3Si-3(Sn) ternary alloy also recorded a slight decrease in density compared with the as-cast Cu-3Si-3(Sn) and parent alloys. Solid solution heat treatment had no positive effect of the impact energy and electrical conductivity of Cu-3Si-3(Zn) ternary alloy. Keywords: Cu-3Si-3Zn; Cu-3Si-3Sn; grainsmorphology; strength; hardness. Title: Synergistic effects of alloying elements and solid solution treatment on the impact energy, density and conductivity of Cu-3Si-3(Zn, Sn) alloys system Author: Agatha Ifeoma ijomah, Kingsley Chidi Nnakwo, Nkem Emelike Nwankwo, Ifeanacho Uchenna Okeke International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 11, Issue 1, April 2023 - September 2023 Page No: 85-90 Research Publish Journals Website: www.researchpublish.com Published Date: 15-September-2023 DOI: https://doi.org/10.5281/zenodo.8348613 Paper Download Link (Source) https://www.researchpublish.com/papers/synergistic-effects-of-alloying-elements-and-solid-solution-treatment-on-the-impact-energy-density-and-conductivity-of-cu-3si-3zn-sn-alloys-systemInternational Journal of Civil and Structural Engineering Research, ISSN 2348-7607 (Online), Research Publish Journals, Website: www.researchpublish.co