Effect of explosive contact and non-contact shock-processing on structure, microstructure and mechanical characteristics of aluminum

Sharma, Akash Deep; Sharma, Ankush; Thakur, Nagesh

doi:10.1007/s00339-013-7649-8

Cited by 4 publications

(2 citation statements)

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“…Another specific feature evident from the WAXD pattern is the peak broadening of the shocked specimen which indicates particle size reduction and complements the theoretical considerations. Under the high pressure of the order of 41.3 GPa the particles undergo plastic deformation mechanism which reduces the particle size [16] .…”

Section: Crystal Phase Determinationmentioning

confidence: 99%

“…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] .…”

Section: Introductionmentioning

confidence: 99%

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

Sharma¹,

Sharma²,

Thakur

2021

j. of met. mater. res.

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Micro-sized copper powder (99.95%; O≤0.3) has been shock-processed with explosives of high detonation velocities of the order of 7.5km/s to observe the structural and microstructural sub-strengthening. Axisymmetric shock-consolidation technique has been used to obtain conglomerates of granular Cu. The technique involves the cylindrical compaction system wherein the explosive-charge is in direct proximity with the powder whereas the other uses indirect shock pressure with die-plunger geometry. Numeric simulations have been performed on with Eulerian code dynamics. The simulated results show a good agreement with the experimental observation of detonation parameters like detonation velocity, pressure, particle velocity and shock pressure in the reactive media. A pin contactor method has been utilized to calculate the detonation pressure experimentally. Wide angled x-ray diffraction studies reveal that the crystalline structure (FCC) of the shocked specimen matches with the un-shocked specimen. Field emissive scanning electron microscopic examination of the compacted specimens show a good sub-structural strengthening and complement the theoretical considerations. Laser diffraction based particle size analyzer also points towards the reduced particle size of the shock-processed specimen under high detonation velocities. Micro-hardness tests conducted under variable loads of 0.1kg, 0.05kg and 0.025kg force with diamond indenter optical micrographs indicate a high order of micro-hardness of the order of 159Hv. Nitrogen pycnometry used for the density measurement of the compacts shows that a compacted density of the order of 99.3% theoretical mean density has been achieved.

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Section: Crystal Phase Determinationmentioning

confidence: 99%