Investigation of Heat Treatment Methods on Microstructure and Hardness of Aluminum-Nickel Bronze Alloy (C95500)

Document Type : Original Research Article

Authors

1 Lecturer, Department of Metallurgy Engineering, Faculty of Shahid Mohajer, Isfahan Branch, Technical and Vocational ‎University (TVU), Isfahan, Iran‎

2 Associate Professor, Department of Materials Science and Metallurgy, Faculty of Engineering, Ferdowsi University, ‎Mashhad, Iran‎.

10.22034/frj.2019.206679.1105

Abstract

In this paper, the effect of heat treatment on the microstructure behavior and hardness of aluminum nickel bronze alloy (C95500) are investigated. The alloys were heat treated in different heat treatment cycles including quenching, normalization, aging and annealing. The microstructure of the samples studied using light microscopy (OM) and Scanning Electron Microscopy (SEM) and Image J software to observe the percentage of phases in the structure. The hardness properties of the heat treated alloys as well as the microstructural micro hardness were evaluated and tested for the hardness of each phase and their comparison with each other and the effect of the phases on the overall hardness of the samples. The results show that the quenched samples and then aged are associated with increasing hard phases 'β and γ_2 (or δ), increasing these two phases in the alloy improves the hardness properties. The α-Widmanstätten phase is also a hard phase according to the micro hardening results, which increases it increasing hardness in the field. It should be noted that the formation of each of the phases in the microstructure will be subject to the heat treatment required to create that phase, such that aging causes the k-phase, the quenching to create the β phase as well as the normalize to the α-Widmanstätten phase.

Keywords

References

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History

  • Receive Date: 30 October 2019
  • Revise Date: 08 December 2019
  • Accept Date: 16 December 2019

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