Abstract
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.
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