Mechanically alloyed Mo-Si-B alloys with a continuous a-Mo matrix and improved mechanical properties
- Otto-von-Guericke Universitat, Magdeburg, Germany
- University of Magdeburg, Germany
- ORNL
- Plansee SE, Technologiezentrum, Austria
- Technology Center, Austria
Mechanical alloying (MA) followed by cold isostatic pressing (CIPing), sintering and hot isostatic pressing (HIPing) was used to prepare Mo-base silicide alloys consisting of a Mo(Si) solid solution and the intermetallic phases Mo{sub 3}Si and Mo{sub 5}SiB{sub 2}. The microstructural development during milling of both binary Mo-Si and Mo-B and ternary Mo-Si-B powder mixtures was evaluated. While obtaining a supersaturated solid solution requires rather long milling times, domain size (which correlates with the grain size) is reduced to below 100 {angstrom} after about 10 h of milling. After heat treatment and consolidation the microstructure reveals a continuous {alpha}-Mo matrix with embedded, uniformly distributed intermetallic particles. The establishment of such a microstructure is beneficial for the mechanical properties since, as compared to a discontinuous {alpha}-Mo matrix, it decreases the brittle-to-ductile transition temperature (BDTT) by about 150 K.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 936540
- Journal Information:
- Intermetallics, Journal Name: Intermetallics Journal Issue: 7 Vol. 16; ISSN 0966-9795; ISSN IERME5
- Country of Publication:
- United States
- Language:
- English
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