Accession Number : AD1032942


Title :   A Fundamental Approach to Developing Aluminium based Bulk Amorphous Alloys based on Stable Liquid Metal Structures and Electronic Equilibrium - 154041


Descriptive Note : Technical Report,17 Jun 2015,16 Dec 2016


Corporate Author : UNIVERSITY OF NEW SOUTH WALES KENSINGTON Australia


Personal Author(s) : Laws,Kevin


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1032942.pdf


Report Date : 28 Mar 2017


Pagination or Media Count : 7


Abstract : The primary aim of this research project was to apply a novel topological and electronic-based model recently developed by the principal investigator in collaboration with the US Air Force Research Laboratory for accurately predicting compositions of new amorphous alloys specifically based on aluminium with properties superior to commercial crystalline metals and existing amorphous alloys. This research investigated alloy families that contained a variety of elements including Al, Cu, Ni, Zr, Mg, Pd, Ga, Ca. Many new Al-based amorphous alloys were found within the numerous alloy systems studied in this project, and these were found specifically in compositional regions predicted by our amorphous alloy structural model. However, the critical casting dimensions of these alloys were still considered as sub-millimetre, and hence could not producible as bulk specimens of substantial size for practical structural applications. To date, the crystallisation kinetics of these Al-based alloys is difficult to supress by cooling rates achievable by standard casting practices. Some systems remain good candidates for further studies which will be pursued beyond the length of this project.


Descriptors :   crystal structure , free electrons , melting point , phase transformations , wear resistance , xray diffraction , electron microscopy , scanning electron microscopy , glass transition temperature , alloys , liquid metals , metallic glass


Subject Categories : Metallurgy and Metallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE