Computer Modeling of Ceramic Boride Composites
Abstract
This effort was to investigate regularities and mechanisms of kinetics growth of boride-boride composites of eutectic cocrystallization by means of computer modeling. In terms of project's scope of work a lot of new important results were obtained. Calculations showed that coefficients of thermal expansion (CTE) for LaB6 and systems LaB6 MeB2 (Me Zr, Ti) have an jump in temperature interval from 750 K to 1000 K. At elevation of temperature the energy of contact surface in these systems decreases however the system preserves its mechanical properties up to melting temperatures. Ideal work of adhesion of the interface [001]-LaB6//[001]-TixZr1-xB2, (110)-LaB6//(110)-TixZr1-xB2 increases if titanium concentration elevates. Change of a direction of fibers growth at directed solidification of eutectics LaB6 TixZr1 xB2 is associated with a big loss in energy at formation of semi-coherent interface as titanium concentration increases. A conception of internal energy sources allocated on interfaces and in phase volume of composites and is the bond energy among composite's components in a solid state: surface energy of interfaces, spot defects, internal stresses governed by components CTE, etc. is proposed. A new model of interface evolution at heating where a surface boundary between phases turns into a boundary with a thickness (i.e. volumetric) and consists of two solid parts with a liquid between is presented. Computer software to obtain multi-fractal characteristics of 2D images obtained in electron microscope is developed. A package of computer programs for 2D imitative modeling of formation of eutectic structures is developed on the base of cellular automates. Moreover the analytical review of both a retrospective and current Russian and Ukrainian papers in the field of new materials for aviation is carried out. The results obtained under this project are published in 21 papers, one monograph is also submitted to print; 17 papers are presented at conferences.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2014
- Accession Number
- ADA622804
Entities
People
- Valeriy V. Kartuzov