Abstract
ABSTRACTRecent efforts in engineering metals with high structural efficiency have resulted in developing a new category of artificial materials with heterogeneous microstructures architected across multiple scales. In this critical assessment, a relatively new concept of heterogeneous bimodal harmonic-structure (bHS) materials is introduced and analysed. It is shown that the bHS concept is applicable to a large variety of metallic materials and is most efficient in scenarios where changes in the chemical composition of materials are restricted for some reason. Basic principles, weaknesses and advantages along with present development status and perspectives are discussed. The overview of critical performance characteristics of various bHS materials is provided, and interesting directions for future research, development and applications are proposed.
Highlights
Introduction and conceptsImprovement of structural efficiency in metallic materials is among the main drivers of our technology developments
In the structural metals domain, the highest impact was made by research in the area of severe plastic deformation (SPD), which grown exponentially from the mid-1990s and culminated at the end of the first decade in the 2000s
It can be seen that bimodal harmonic-structure (bHS) materials have more regular microstructure pattern and demonstrate a much narrower distribution of properties in the structural space indicating a better consistency in performance compared to bimodal random (bR) counterpart, as explained in detail
Summary
Introduction and conceptsImprovement of structural efficiency in metallic materials is among the main drivers of our technology developments. Bimodal grain size distribution in metallic materials can be formed by various recently developed techniques including traditional thermo-mechanical processing [29,30], more novel SPD [21,31,32] and a powder metallurgy route [33,34].
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