Portevin–Le Chatelier Effect in Nimonic 263 Superalloy

Nimonic 263 Microstructure and Surface Characterization after Laser Shock Peening

P. Drobnjak, High Technical School “Tehnikum-Tau runum”, Belgrade, Serbia, A. Kovačević, Institute of Physics, University of Belgrade, Serbia, A.Milosav lje vić, Faculty of Mechanical Engineering, University of Belgrade, Serbia, Ž. Radovanović, Faculty of Tech no lo gy and Metallurgy, University of Belgrade, Ser bia, I. Samardžić, Faculty of Mechanical Engine ering, Slavonski Brod, University o...

Portevin-Le chatelier effect

Aluminum subjected to smooth mechanical loading does not often deform in a correspondingly smooth manner. Typically it deforms inhomogeneously through the propagation of deformation fronts that slowly traverse the sample. These are called Portevin-Le Chatelier fronts; what determines their velocity has been somewhat mysterious. We present a phenomenological theory for deformation fronts that ce...

Prediction of the Hot Compressive Deformation Behavior for Superalloy Nimonic 80A by BP-ANN Model

Abstract: In order to predict hot deformation behavior of superalloy nimonic 80A, a back-propagational artificial neural network (BP-ANN) and strain-dependent Arrhenius-type model were established based on the experimental data from isothermal compression tests on a Gleeble-3500 thermo-mechanical simulator at temperatures ranging of 1050–1250 ̋C, strain rates ranging of 0.01–10.0 s ́1. A comparis...

Portevin–Le Chatelier effect in an aluminum alloy

Editorial 263..263

In this issue (pp. 264–270), Hinman et al. review the results of economic evaluation studies of rubella vaccine published between 1970 and 2000. Most of the studies they include were designed to answer the question of whether the introduction of rubella vaccine into national immunization systems is economically justified. Five out of the 17 economic evaluation studies they used were carried out...