Abstract
Al-based glassy alloys (metallic glasses) have been of great scientific and technological interest as a high specific strength and high corrosion resistant materials. However, the low glass-forming ability (GFA) is still a choke point that greatly influences the applications. In order to further comprehend the glass formation mechanism and investigate the possibility of enhancing the GFA, it is important to obtain the definite information on the atomic scale glassy structures in correlation with properties and to study the composition dependence of crystallization and properties of Al-based metallic glasses. The purpose of this paper is to summarize the structure characteristics and crystallization behavior in conjunction with alloy component in Al-based metallic glasses and to investigate the possibility of synthesizing an Al-based bulk metallic glass with better engineering performances. This may assist to learn the structural features systematically and understand the development and current status for Al-based metallic glasses.
Highlights
Metallic glasses have been intensively investigated in conjunction with the developments of various meltquenched techniques
The objective of this paper is to provide a review of Al-based metallic glasses in the aspects of the local structure, thermal stability and crystallization behavior
This paper mainly introduces the features of the structure characteristics and crystallization of Al-based metallic glasses
Summary
Metallic glasses have been intensively investigated in conjunction with the developments of various meltquenched techniques. The GFA of Al-based metallic glasses is relatively low comparing with other metallic glasses, resulting in the limitation of applications Such relatively low GFA has been attributed to the following two aspects: (1) their formation ranges are located in Al-rich composition range which is largely away from their eutectic point[45]; (2) the bonding mode of Al-RE, Al-ETM and Al-LTM pairs is covalent-like so as to enable easy precipitation of Al-based compounds. The atomic-level understanding of the structural characteristics is important for developing a new BMG with high GFA. The accurate knowledge can promote the understanding on the effect of local atomic configuration structure on fundamental properties and contribute to future development and applications of Al-based metallic glasses
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