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.
Structure and crystallization of amorphous FeMoB alloys obtained by electroless plating
Abstract FeMoB alloys are prepared by electroless plating. It is found that when the boron content ranges from 10.1–30.00 at.%, the structure is amorphous. A two-step process of crystallization is observed for the amorphous Fe 63.4 Mo 13.3 B 23.3 , Fe 58.7 Mo 11.3 B 30.0 , Fe 73.6 Mo 16.3 B 10.1 and Fe 74.7 Mo 18.9 B 6.4 alloys. The crystallization temperature ranges from 745 to 771 K for a B content ranging from 6.4–30.0 at.% of the amorphous samples, which is higher than the range for the FeB amorphous films.
Structure and crystallization of amorphous Fe-B alloys obtained by chemical plating
Abstract Fe100-xBx (x = 2.2–27.4 at%) alloys are prepared by chemical plating. It is found that when the boron content is 18 at% or more, the structure is amorphous. A two-step process of crystallization is observed for the amorphous specimens. The kinetics of the crystallization is discussed; it is analogous to that for samples prepared by rapid quenching. The activation energy of crystallization for the present samples ranges from 184.5 to 129.1 kJ/mol as the boron content varies from 18 to 27.4 at%; this is lower than that for the same composition alloys produced by rapid quenching.