Microstructural change during (liquid phase sintering) of W-Ni-Fe alloy
- Division of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Cheongryang, Seoul (KR)
The changes of bulk density and microstructures during heating and liquid phase sintering of 98W-1Ni-1Fe compacts prepared from 1 and 5 {mu}m W powders have been observed in order to characterize the densification behavior. The compact prepared from a fine (1 {mu}m) W powder begins to densify rapidly at about 1200{degrees}C in the solid state during heating, attaining about 95 pct density upon reaching the liquid phase sintering temperature of 1460{degrees}C. The compact prepared from a coarse (5 {mu}m) W powder begins to densify rapidly at about 1400{degrees}C in the solid state, attaining about 87 pct density upon reaching the liquid phase sintering temperature. Thus, the skeleton of grains is already formed prior to liquid formation. During the isothermal liquid phase sintering, substantial grain growth occurs, and the liquid flows into both open and closed pores, filling them sequentially from the regions with small cross-sections. The grains subsequently grow into the liquid pockets which have been formed at the pore sites. The sequential pore filling by first liquid thus is shown to be the dominant densification process during the liquid phase sintering of this alloy.
- OSTI ID:
- 6926976
- Journal Information:
- Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA) Vol. 20A:5; ISSN MTTAB; ISSN 0360-2133
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CRYSTAL STRUCTURE
DENSITY
EPITAXY
FABRICATION
IRON ALLOYS
LIQUID PHASE EPITAXY
MICROSTRUCTURE
NICKEL ALLOYS
PHASE STUDIES
PHYSICAL PROPERTIES
POWDERS
SINTERING
TUNGSTEN ALLOYS