Substantial Improvement of High Temperature Strength of New-Generation Nano-Oxide-Strengthened Alloys by Addition of Metallic Yttrium

0555808 - ÚFM 2023 RIV CH eng J - Journal Article
Svoboda, Jiří - Bořil, Petr - Holzer, Jakub - Luptáková, Natália - Jarý, Milan - Mašek, B. - Dymáček, Petr
Substantial Improvement of High Temperature Strength of New-Generation Nano-Oxide-Strengthened Alloys by Addition of Metallic Yttrium.
Materials. ROČ. 15, č. 2 (2022), č. článku 504. E-ISSN 1996-1944
R&D Projects: GA ČR GX21-02203X
Institutional support: RVO:68081723
Keywords : mechanical alloying (MA) * oxide dispersion strengthened (ODS) alloy * powder hot consolidation by rolling
OECD category: Materials engineering
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1996-1944/15/2/504

Oxide-dispersion-strengthened (ODS) Fe-Al-Y2O3-based alloys (denoted as FeAlOY) containing 5 vol. % of nano-oxides have a potential to become top oxidation and creep-resistant alloys for applications at temperatures of 1100-1300 & DEG,C. Oxide dispersoids cause nearly perfect strengthening of grains, thus, grain boundaries with limited cohesive strength become the weak link in FeAlOY in this temperature range. One of the possibilities for significantly improving the strength of FeAlOY is alloying with appropriate elements and increasing the cohesive strength of grain boundaries. Nearly 20 metallic elements have been tested with the aim to increase cohesive strength in the frame of preliminary tests. A positive influence is revealed for Al, Cr, and Y, whereby the influence of Y is enormous (addition of 1% of metallic Y increases strength by a factor of 2), as it is presented in this paper.
Permanent Link: http://hdl.handle.net/11104/0330878