loading page

Process Optimization of High Entropy Alloys by Laser Additive Manufacturing
  • +4
  • Modupeola Dada,
  • Patricia Popoola,
  • Ntombi Mathe ,
  • Sisa Pityana,
  • Samson Adeosun,
  • Olufemi Aramide,
  • Thabo Lengopeng
Modupeola Dada
Tshwane University of Technology Pretoria Campus
Author Profile
Patricia Popoola
Tshwane University of Technology
Author Profile
Ntombi Mathe
Council for Scientific and Industrial Research
Author Profile
Sisa Pityana
Council for Scientific and Industrial Research
Author Profile
Samson Adeosun
University of Lagos
Author Profile
Olufemi Aramide
Tshwane University of Technology
Author Profile
Thabo Lengopeng
Council for Scientific and Industrial Research
Author Profile

Abstract

Aerospace components and its coatings are required to possess excellent surface properties namely: fatigue, wear and corrosion resistance over a wide temperature range. Stainless steels, titanium, nickel superalloy and more recently high entropy alloys have been used to improve the exterior properties of these components. In this study, AlCoCrFeNiCu and AlTiCrFeCoNi High Entropy Alloys were successfully fabricated using laser additive manufacturing to produce coatings on a mild steel base plate. The influence of the laser parameters (laser power and scan speed) on the microstructure, hardness and coat geometry (height, width and depth) were also investigated. The results revealed that coatings homogeneously adhered to substrate. The optimum processing parameters for both alloys with defect free structures at a preheat temperature of 400 °C, were at 1200-1600 W at 8-12 mm/s with the layers composed of both FCC and BCC phases. The laser parameters affected the geometry, quality and hardness. The results showed that optimizing the laser parameters achieved by preheating temperature invariably improved the performance of the alloys with potential coatings and aerospace structural applications.

Peer review status:Published

30 Jan 2020Submitted to Engineering Reports
31 Jan 2020Submission Checks Completed
31 Jan 2020Assigned to Editor
18 Feb 2020Reviewer(s) Assigned
20 Apr 2020Editorial Decision: Revise Major
19 Jun 20201st Revision Received
22 Jun 2020Submission Checks Completed
22 Jun 2020Assigned to Editor
22 Jun 2020Reviewer(s) Assigned
29 Jun 2020Editorial Decision: Accept
19 Aug 2020Published in Engineering Reports. 10.1002/eng2.12252