Study on the Crystal Structure and Microstructure Evolution of Shock-processed Titanium Powder

Abstract

Titanium powder was rapidly solidified by using shock-wave consolidation technique. The critical parameters were controlled by intrumented detonics and pin-oscillography. The compacted specimens were investigated for structural and microstructural strengthening by using standard diagnostic techniques. The density of the final product was found to be greater than 96% of the theoretical value. X-ray diffraction pattern reveals intact crystalline structure without the presence of any undesired phases. The particle size reduction indicated by XRD was supported by laser diffraction based particle size analyzer. Results from energy dispersive spectroscopy rule out the possibility of any segregation within the compacts. Scanning electron microscopy showed crack-free, voids-free, melt-free, fracture-less compacts of titanium with the uni-directional dendrites orientation without any grain-growth.

A Constitutive Modeling and Experimental Effect of Shock Wave on the Microstructural Sub-strengthening of Granular Copper

“…Distinctive challenges arising on the solidification/ compaction of powders are due to deterioration of fine grained structure as well as formation of undesired phases in the crystal structure that may result into weak sub-structural strengthening and poor mechanical properties. These powder metallurgical processes due to the high capital investment and extended operating period do not provide satisfactory microstructural sub-strengthening [6][7][8][9] .…”