Interfacial structure of .BETA.-silicon nitride whisker reinforced 7075 aluminum alloy composite.

Interfacial structure in silicon nitride sintered with lanthanide oxide

Three independent research groups present a comparison of their structural analyses of prismatic interfaces in silicon nitride densified with the aid of lanthanide oxide Ln2O3. All three groups obtained scanning transmission electron microscope images which clearly reveal the presence of well-defined Ln segregation sites at the interfaces, and, moreover, reveal that these segregation sites are ...

Mechanical properties of hydroxyapatite whisker reinforced polyetherketoneketone composite scaffolds.

The apparent mechanical properties of hydroxyapatite (HA) whisker reinforced polyetherketoneketone (PEKK) scaffolds were evaluated in unconfined, uniaxial compression to investigate the effects of the porosity (75%, 82.5% and 90%), HA content (0, 20 and 40 vol%) and mold temperature (350, 365 and 375 ( composite function)C). Increased porosity resulted in a non-linear decrease in the elastic mo...

Fabrication of Aluminum Matrix Composite Reinforced by Silicon Carbide of Various Micro-structures

Improving Mechanical Properties of PVPPA Welded Joints of 7075 Aluminum Alloy by PWHT

In this study, 7075 aluminum alloy with a thickness of 10 mm was successfully welded with no obvious defects by pulsed variable polarity plasma arc (PVPPA) welding. The mechanical properties of PVPPA welded joints have been researched by post weld heat treatment (PWHT). The results indicate that the heat treatment strongly affects the mechanical properties of the welded joints. The tensile stre...

Development of an Artificial Neural Network Constitutive Model for Aluminum 7075 Alloy

Development of an accurate neuronal material model for aluminum alloys would facilitate better process control and parameter optimization in the aircraft industry. This research primarily attempts to design a connectionist constitutive model for aluminum 7075 alloy using multi-layer perceptrons. The backpropagation algorithm is used to train the designed network whose performance is then valida...