Cast Intermetallic Alloys and Composites Based on Them by Combined Centrifugal Casting—SHS Process
This work aims to establish a scientific and engineering background in the production of cast multicomponent alloys and metalmartix composite (MMCs) via Self-Propagating High Temperature Synthesis (SHS, combustion synthesis) which is a novel process technique regarding fast and low-cost production ability. We carried out the search for reactive systems and process parameters that would ensure preparation of cast multicomponent materials in a single process. The principles and methods of the SHS thermite-type reaction processes have been investigated under high-gravity values applying loads up to 1000 g with special centrifuge set-up. In this way we expected to improve the yield of target product, remove gaseous byproducts, diminish the grain size in the product, and make product composition more uniform. The obtained results can be expected to make a theoretical background for industrial-scale manufacturing of heat-resistant intermetallic alloys, master alloys, catalysts, MMCs etc.
Fine-grained Co–Cr–Mo alloy by combined use of SHS and thermomechanical treatment
A Co–Cr–Mo alloy with homogenous ultrafine-grained structure prepared by combined use of metallothermic SHS and subsequent thermomechanical treatment (TMT) was characterized by SEM and XRD and the processing conditions were optimized.
Determination of the constitution of the quasi–binary eutectic NiAl–Re system by DTA and microstructural investigations
Abstract The constitution of the quasi–binary eutectic NiAl–Re section of the ternary Al–Ni–Re phase diagram was reinvestigated by using differential thermal analysis, metallography and scanning electron microscopy. The alloys studied were stoichiometric NiAl and various NiAl–Re x (0.75 x 1.25 alloy using Bridgman technique at a low growth velocity of 30 mm h −1 . The melting temperature of the stoichiometric NiAl compound is 1674 °C. The eutectic point of the quasi–binary section of the NiAl–Re system is determined to be at 1.25 at.% Re and a temperature of 1668 °C. The solidus temperatures of the NiAl–Re ingots exhibit a slight dependence on the Re concentration. The solid solubility of Re in NiAl is 0.6 at.% at the eutectic temperature and 0.2 at.% at 1300 °C.