Cold dynamic compaction of pre-alloyed titanium and activated sintering
The use of dynamic compaction has been found to allow the cold consolidation of Ti-6Al-4V to densities of 99% T.D. Although full interparticle welding was not attained, bonding was found to occur during a low temperature sintering operation; below the ..beta.. transition. The high strengths and toughness values thus obtained are due to an activation of the sintering operation caused by the removal of surface oxide and good metal to metal bonds formed during dynamic compaction, when extensive local shearing of the particles surface occurs. This activation of sintering allows a control of microstructure and in particular, avoidance of embrittling phases. During compaction the passage of the shock wave results in the formation of a shocked structure. Spherical powders usually compact dynamically to characteristic shapes. The shock hardening allows the particle through which the shock has passed to deform the subsequent particle it impacts. This is rarely observed with the titanium alloy, indicating the low shock hardening or high initial hardness of the powders. Areas of interparticle melting were observed, but appeared to be the melting of a third particle rather than melting and bonding between particles.
- Research Organization:
- Metal Powder Industries Federation, Princeton, NJ (USA); Allied Corp., Morristown, NJ
- OSTI ID:
- 5380923
- Report Number(s):
- CONF-8205171-
- Journal Information:
- Prog. Powder Metall.; (United States), Vol. 38; Conference: National powder metallurgy conference, Montreal, Canada, 24 May 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
POWDER METALLURGY
SINTERING
ALLOYS
CRYSTAL STRUCTURE
FABRICATION
METALLURGY
TITANIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies