Research on improve the mechanical property by selective formation of Y-Ti-O complex oxide in Ni-based ODS alloy
- Authors
- Park, Chun Woong; Choi, Won June; Byun, Jong Min; Kim, Young Do
- Issue Date
- Oct-2019
- Publisher
- Materials Science and Technology
- Keywords
- Complex oxide; High temperature properties; Mechanical alloying; ODS alloys
- Citation
- MS and T 2019 - Materials Science and Technology 2019, pp.1217 - 1224
- Indexed
- SCOPUS
- Journal Title
- MS and T 2019 - Materials Science and Technology 2019
- Start Page
- 1217
- End Page
- 1224
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12518
- DOI
- 10.7449/2019/MST_2019_1217_1224
- ISSN
- 0000-0000
- Abstract
- Y₂O₃ is mainly applied as a dispersoid in Ni-based oxide dispersion strengthened (ODS) alloys. The added Y₂O₃ reacts with Ti and Al at a temperature above 1150°C to form a complex oxide such as Y-Ti-O or Y-Al-O. However, previous studies have shown that Y-Al-O complex oxide has relatively coarser particles than Y-Ti-O. In this study, Ti was first added to form Y-Ti-O complex oxide, which has relatively fine particles. Subsequently, Al was added to inhibit the formation of Y-Al-O complex oxide, thus improving the high-temperature mechanical properties of ODS alloys. Ni-based ODS alloy powders with composition Ni-15CrxTi-1.1Y₂O₃ were mechanically alloyed using a planetary mill. Thereafter, the mechanically alloyed powders were heat treated to form a complex oxide of Y-Ti-O. A second mechanical alloying was performed by adding 4.5 wt.% Al to the heat treated powders. The products obtained after the second alloying were sintered by SPS. The sintered specimens analyzed using a XRD, TEM and hot hardness meter.
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