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Structural Size Effects of Intermetallic Compounds on the Mechanical Properties of Mo-Si-B Alloy: An Experimental Investigation

Title
Structural Size Effects of Intermetallic Compounds on the Mechanical Properties of Mo-Si-B Alloy: An Experimental Investigation
Author
김영도
Keywords
Mo-Si-B alloys; intermetallics; powder processing; mechanical properties; scanning electron microscopy (SEM)
Issue Date
2016-01
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v. 22, NO 1, Page. 81-86
Abstract
In general, size, shape and dispersion of phases in alloys significantly affect mechanical properties. In this study, the mechanical properties of Mo-Si-B alloys were experimentally investigated with regards to the refinement of intermetallic compound. To confirm the size effect of the intermetallic compound phases on mechanical properties, two differently sized intermetallic compound powders consisting Mo5SiB2 and Mo3Si were fabricated by mechano-chemical process and high-energy ball milling. A modified powder metallurgy method was used with core-shell intermetallic powders where the intermetallic compound particles were the core and nano-sized Mo particles which formed by the hydrogen reduction of Mo oxide were the shells, leading to the microstructures with uniformly distributed intermetallic compound phases within a continuous alpha-Mo matrix phase. Vickers hardness and fracture toughness were measured to examine the mechanical properties of sintered bodies. Vickers hardness was 472 Hv for the fine intermetallic compound powder and 415 Hy for the coarse intermetallic compound powder. The fracture toughness was 12.4 MPa.root m for the fine IMC powders and 13.5 MPa.root m for the coarse intermetallic compound powder.
URI
https://link.springer.com/article/10.1007%2Fs12540-015-5497-0http://hdl.handle.net/20.500.11754/31440
ISSN
1598-9623; 2005-4149
DOI
10.1007/s12540-015-5497-0
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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