Recent Progress in the Industrialization of Metallic Glasses

Eugen      M. Axinte; Marius      P.I. Chirileanu

Abstract

Metallic Glasses (MGs), also called glassy metals (amorphous metals, liquid metals) are considered to be the materials of the future. Metallic glasses, formed at very low critical cooling rates, are different from traditional amorphous alloys (which are usually formed at high cooling rates) in order to avoid crystallization. The most important feature of MGs, which distinguishes them from ordinary amorphous materials, is the glass transition that transforms super cooled liquids into a glassy state when cooled from high to low temperature. Some scientists have been investigating the mechanisms and dynamics of metallic glass formation, their atomic structure, micromechanisms of mechanical properties, etc. They have also been exploring the atomic-scale mechanisms of MG formation and the development of new bulk glassy alloys and composites with improved glass-forming ability. Other scientists focus on manufacturing and industrialization of MGs. At the Chinese Academy of Sciences (CAS), there are currently more than 30 groups working on the science, preparation and applications of MGs. The Amorphous Materials and Physics Group at CAS has developed a series of rare earth-based RE-MGs with functional physical properties. In the US, there are science groups that have made successful progress in the area of metallic glasses. More specifically, the US-based team from Yale and the science group from Caltech are more focused on practical aspects relating to MGs (production, industrialization, biomedical materials and aerospace materials). This patent review article briefly investigates the industrialization and some environmental aspects of MGs, as follows: biocompatibility of most MGs, obtaining valuable MGs from low-purity industrial raw materials, use of MGs in green energy applications (solar cells, hydrogen production), use of MGs in catalyst systems and possibilities for using metallic glasses in systems for retention and purification of dangerous pollutants.

Keywords: Aerospace, atomic structure, biomedical, defence, environmental, glass forming ability, green energy, metallic glasses, new alloys, processing, solar cells, hydrogen production