This paper describes an instrument capable of detecting flaws in “green-state” (prior to sintering) powder metallurgy (P/M) parts. The instrument uses a matrix of impedance measurements from a multiprobe array that contacts the surface of the P/M part. The array of measured data is processed to not only detect the presence of flaws but determine their location, size, and orientation as well. Ex...

Fabrication and characterization of aluminum matrix composites containing different volume fractions of Ni3Al powder (5-40 Vol%) were investigated. Ni3Al powder was produced by mechanical alloying of elemental nickel and aluminum powder mixture. Al-Ni3Al composite parts were prepared using a powder metallurgy route involving two stages Al and Ni3Al powder mixtures were first compacted under 500...

After a few decades of increasing interest, spark plasma sintering (SPS) has now become mature powder metallurgy technique, which allows assessing its performances toward fabricating enhanced materials. Here, the case metals and alloys will be presented. The main advantage SPS lies in rapid heating capability enabled by application high intensity electric currents to metallic powder. This prese...

An original processing route by powder metallurgy was developped to alloy pure Ni foams so, that the foam becomes refractory for high temperature applications. The modelling of such a foam at high temperature starts from the behavior of the basic constitutive material, then we use micromechanical models to predict the mechanical properties under tension and in compression creep. A 3D finite ele...

This paper describes an instrument capable of detecting flaws in "green-state" (prior to sintering) powder metallurgy (P/M) parts. The instrument uses a matrix of impedance measurements from a multiprobe array which contacts the surface of the P/M part. The array of measured data is processed to not only detect the presence of flaws, but also determine their location, size, and orientation. Exp...

The artificial neural network (NN) methodology presented in this paper has been developed for selection of powder and process parameters for Powder Metallurgy (PM) part manufacture. This methodology differs from the statistical modelling of mechanical properties in that it is not necessary to make assumptions regarding the form of the functions relating input and output variables. Employment of...