|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||I-5: Warm Pressing of Al Powders: An Alternative Consolidation Approach
||Peter Krizik, Martin Balog, Oto Bajana, Maria Victoria Castro Riglos, Peter Švec Sr.
|On-Site Speaker (Planned)
This paper presents the warm pressing as an alternative PM approach to conventional press-and-sinter or hot working (e.g., extrusion, forging) consolidations of Al powders into complex near-net-shape parts of required mechanical properties. In this study gas-atomized Al powders (A1050 and A6061) of various particle sizes were consolidated by uniaxial pressing, with minimum plastic deformation induced, at temperatures of 22–430°C. The materials pressed ≤ 100°C showed poor strengths, ductility, Young`s modulus and electrical conductivity. The properties increased gradually when pressing temperature increased > 200 °C and reached values comparable to those of PM based and wrought materials. Similarly, the properties of the materials pressed < 200°C improved after annealing at 300°C for 2 h. This indicated formation of proper interfacial bonding between native oxide layers on adjacent Al powder particles (i.e., grains) > 200°C. With interfacial bonding established, fracture mechanism changed from brittle to ductile character.
||Planned: Light Metals