Determination of Transformation Induced Heat Transfer Coefficients in Mechanical Properties of Powder Metallurgy Steels
2 Abstract: Powder metallurgy has been used for the manufacture of fully dense, which have not reacted composites consisting of a matrix of copper containing 50 -60 vol% particles with negative thermal ZrW2O8 expansion. On cycling between 25 and 300°C, the compounds showed coefficients thermal expansion which varies rapidly with temperature and significantly larger than expected by theory. Improvements in adhesion strength and thermal properties of composite materials have been achieved in atomized copper alloy with small additions of chromium to increase the interfacial bonding in composite Cu / diamond from a nano-sized thin Cr3C2layer.
Constitutive relationship for high temperature deformation of powder metallurgy Ti-47Al-2Cr-2Nb-0.2W alloy
Abstract The high temperature compressive deformation behavior of powder metallurgy (P/M) Ti–47Al–2Cr–2Nb–0.2 W alloy was investigated at temperatures ranging from 1323 K to 1473 K, and strain rates from 0.005 s −1 to 1 s −1 . The flow curves after corrections of the friction and the temperature compensations were employed to develop constitutive equations. The effects of the temperature and the strain rate on deformation behaviors were represented by Zener–Hollomon parameter in an exponent type equation. The influence of strain was incorporated in the constitutive analysis by considering the effect of the strain on material constants. A five-order polynomial was found suitable to represent the influence of the strain. The constitutive equation considering the compensation of the strain predicts very well the flow behaviors throughout the deformation conditions except at 1323 K and 0.005 s −1 .
SMC composites waste management as reinforcing fillers in polypropylene by combination of mechanical and chemical recycling processes
A new process of management of waste of composite materials from Sheet Moulding Compounds (SMC), as reinforcing fillers for thermoplastic materials, including both mechanical and chemical processes is proposed in this paper. Communited SMC being composed of coated glass fibres intimately mixed with calcium carbonate powder, their reinforcing power is low. First, the fibrous part was increased by partial dissolution of calcium carbonate present in the crushed products SMC. Second, a process of partial solvolysis was developed aiming at strong increasing the interfacial mechanical properties by functionalising of SMC load incorporated into polypropylene/grafted maleic anhydride polypropylene (PP/PPgma). At this effect, we investigated a treatment with a hot triamine (diethylenetriamine, DETA) in order to create a functionalisation, after scission of the bond ester of unsaturated polyester, as bridging amino-succinimide.The effect of this recycling way by partial solvolysis was checked from the mechanical properties of the resulting reinforced PP/PPgma material: Although a lower of Young modulus, better yield stress and especially resilience were observed.