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

  • Franklin Amaechi Anene Metallurgical and Materials Engineering Department, Nnamdi Azikiwe University, Awka, Anambra State
  • Nkem Emelike Nwankwo Metallurgical and Materials Engineering Department, Nnamdi Azikiwe University, Awka, Anambra State
  • Victor Ugochukwu Nwoke Metallurgical and Materials Engineering Department, Nnamdi Azikiwe University, Awka, Anambra State
Keywords: NiAl bronze, dopant, heat treatment, microstructure, quenching, aging

Abstract

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.

Author Biographies

Nkem Emelike Nwankwo, Metallurgical and Materials Engineering Department, Nnamdi Azikiwe University, Awka, Anambra State

Dr Nkem Nwankwo is senior lecturer  in the department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka.

Victor Ugochukwu Nwoke, Metallurgical and Materials Engineering Department, Nnamdi Azikiwe University, Awka, Anambra State

Mr Victor Nwoke is a lecturer in the department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka but currently on a research work in UK.

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Published
2019-07-02
Section
Research