Effect of nano-yttria dispersion on the microstructure and mechanical properties of W-Ni-Co alloys Online publication date: Thu, 16-Jan-2020
by C. Pandi Selva Durai; V. Arul Mozhi Selvan; T.K. Singha; S. Kumaran
International Journal of Materials and Product Technology (IJMPT), Vol. 59, No. 4, 2019
Abstract: The effect of nano-Y2O3 (0.25-0.75 wt.%) addition in tungsten heavy alloy which consists of 93 weight percentage tungsten and Ni/Co ratio fixed at 9 was investigated. Ni, Co and Y2O3 were mixed in high-energy ball milling to obtain nanostructure and this mixture subsequently blended with tungsten (W) in a low energy ball milling. The powder mixture was consolidated by cold-isostatic pressing, and the green compact was sintered at 1,475°C for 2 hrs, followed by post annealing at 1,100°C for 1.5 hrs. W-Ni-Co alloys thus processed exhibits density greater than 96% of theoretical density. Lowest distortion of 1.5 mm was found in yttrium oxide dispersed W-Ni-Co alloy using a coordinate measuring machine. The second phase of nano-Y2O3 distributes in W-grains and matrix significantly influences grain morphology, size, microstructural features and mechanical properties. Dispersion of nano-Y2O3 enhances hardness of the matrix due to the grain refinement and formation of the inter-metallic compound.
Online publication date: Thu, 16-Jan-2020
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Materials and Product Technology (IJMPT):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com