Fabrication of Ta2O5 Dispersion-Strengthened Mo-Si-B Alloy by Powder Metallurgical Method
- Authors
- Byun, Jong Min; Choi, Won June; Bang, Su-Ryong; Park, Chun Woong; Kim, Young Do
- Issue Date
- Apr-2017
- Publisher
- SPRINGER
- Citation
- JOM, v.69, no.4, pp.683 - 688
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOM
- Volume
- 69
- Number
- 4
- Start Page
- 683
- End Page
- 688
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20437
- DOI
- 10.1007/s11837-016-2243-0
- ISSN
- 1047-4838
- Abstract
- In this study, we investigate the effect of oxide dispersion strengthening on mechanical properties by dispersion of nano-sized Ta₂O₅ particles in Mo-Si-B alloy. A Mo-Si-B core-shell powder consisting of two intermetallic compounds of Mo₅SiB₂ and Mo₃Si as the core and nano-sized Mo solid solution surrounding intermetallic compounds was fabricated by chemical vapor transport. And Mo-Si-B core-shell powder with uniformly dispersed nano-sized Ta₂O₅ particles on the surface of a Mo solid solution shell was produced by a wet blending process with TaCl₅ solution and heat treatment. Then, pressureless sintering was performed at 1400A degrees C for 3 h under a H₂ atmosphere. The hardness and fracture toughness of the Ta₂O₅-dispersed Mo-Si-B alloy were measured using Vickers hardness and 3-point bending tests, respectively. The Vickers hardness and fracture toughness of the fabricated Mo-Si-B-Ta₂O₅ alloy were more improved than that of the Mo-Si-B alloy fabricated using core-shell powder with no addition of Ta₂O₅ particles (Mo-Si-B alloy: 353 Hv, 13.5 MPa center dot aem, Mo-Si-B-Ta₂O₅ alloy: 509 Hv, 15.1 MPa center dot aem).
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