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.
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 *