Title: Experimental investigation of mechanical properties of high-temperature Ni-based super alloy by varying the wt. % of aluminium

Authors: Mohan Kumar Pradhan; Amar Pradhan

Addresses: Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal, 462003, India ' Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal, 462003, India

Abstract: Super alloys are widely used in many advanced industries due to its strength and resistance to oxidation at elevated temperature. The objective is to prepare a Ni-based super alloy with three different Al wt %, and the effects Al element on the oxidation behaviour were studied under high temperature condition at 950°C in dry air isothermal oxidation test. X-ray diffraction and scanning electron microscopy techniques were used to study the micro-structures. As wt. % of Al increases from 5 to 6 it promotes the γ' phase precipitate, which directly increases the volume fraction of γ' phase in the micro-structure of super alloy which enrich Al activity and stimulate continuous Al₂O₃ protection layer to increase oxidation resistance of the alloy. Further compressive strength and micro Vickers hardness of the three samples are also tested. With the Al wt.% increases from 5 to 6 mechanical properties increases significantly.

Keywords: super alloy; oxidation; micro-structure; mechanical properties; SEM; scanning electron microscope; XRD; X-ray diffraction.

DOI: 10.1504/IJMMP.2018.096145

International Journal of Microstructure and Materials Properties, 2018 Vol.13 No.3/4, pp.213 - 227

Received: 20 Dec 2017
Accepted: 29 May 2018
Published online: 13 Nov 2018 *

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