Mechanism of enhanced consolidation of Nb[sub 3]Al powders by ball-milling
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (Japan)
The present paper examines dominating factors in enhanced consolidation by ball-milling. Crushed pieces of Nb[sub 3]Al castings were ball-milled to produce fine-grained structures of about 10nm. The milled powders were characterized using ordinary means such as thin-foil transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Ball-milling was found to enhance consolidation of Nb[sub 3]Al powders at temperature as low as 0.5Tm. The calculation of the densification rate using Ashby's HIP mechanism map showed that the fine-grain structures of about 10nm rather than the small powder size have significantly increased low temperature creep and was responsible for the enhanced consolidation. A good coincidence was found between the measured and calculated density vs time curves by using the power-law creep rate equation with n = 3.
- OSTI ID:
- 6523124
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 28:7; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
CALORIMETRY
DATA
DENSITY
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
INTERMETALLIC COMPOUNDS
MACHINING
MICROSCOPY
MILLING
NIOBIUM ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
POWDERS
TRANSMISSION ELECTRON MICROSCOPY