03.2021.122.127

Study the Impact of Chromium and Yttrium Oxide on the Mechanical Characteristics of Nial Alloy Used in Aircraft Engines

Author(s):

Alaulddin Abdulqader†, Ahlam Hamid Jasim‡*

Affiliation(s):

†Department of Reconstruction and Projects, University of Baghdad, Baghdad, Iraq
‡MS.c – Al-Qasim Green University, Iraq

Corresponding Author Email: ahlam.hamid@wrec.uoqasim.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The present investigation has been performed at 1350°C for 90 min under the atmosphere of argon gas with a nickel aluminide NIAl composite enhanced with yttrium Y2O3 and additional chromium. Brinell hardness according to (ASTM E140 – 12b) was performed. By adding 1.5 wt. % Cr, the compound hardness (90NiAl-10Y2O3) is increased to 290 HB and continues to expand to 373 HB by additivity of 2.5 wt. % Cr to NiAl. The hardness increases to 390 HB for the compound content (70NiAl-30Y2O3) by adding 1.5 wt. % Cr, and continues to develop by adding 2 wt. % Cr to around 406 HB. By the addition of 2.5 wt. % Cr, the hardness increases to 438 HB. The wear test results exposed that the additional cobalt leads to reduce the wear-rate of NiAl- 30Y2O3. Addition of 1.5 wt. % Cr leads to reduce the adhesion wear rate from 7.61 * 10-6 gr/cm to 7.49 * 10-6 gr/cm while adding 2 wt. % of Cr decreases the wear rate to 6.46* 10-6 gr /cm. By the addition of 2.5 wt. % Cr, the wear rate decrease to 5.84 * 10-6 gr/cm.