Abstract
One of the central themes in materials science is the structure-property relationship. In conventional crystalline metals, their mechanical behaviour is often dictated by well-defined structural defects such as dislocations, impurities, and twins. However, the structure-property relationship in amorphous alloys is far from being understood, due to great difficulties in characterizing and describing the disordered atomic-level structure. Herein, we report a universal, yet simple, correlation between the macroscopic mechanical properties (i.e., yield strength and shear modulus) and a unique characteristic structural length in metallic glasses (MGs). Our analysis indicates that this characteristic length can incorporate effects of both the inter-atomic distance and valence electron density in MGs, and result in the observed universal correlation. The current findings shed lights on the basic understanding of mechanical properties of MGs from their disordered atomic structures.
Highlights
Modulus and strength of metallic materials are key properties for their engineering applications[1,2], and the knowledge of structural information is prerequisite for understanding the deformation behaviour[3,4]
Several efforts have been attempted to reveal a scaling behaviour between the glass transition temperature and strength[9,10,11,12,13], and the strength has been found to be proportional to the elastic modulus, corresponding to a nearly-constant yield strain[11,12,13]
It was found that different metallic glasses may have different q1 values and thereby different mechanical properties
Summary
Modulus and strength of metallic materials are key properties for their engineering applications[1,2], and the knowledge of structural information is prerequisite for understanding the deformation behaviour[3,4]. In crystalline materials with long-range periodic atomic packing, the relationship between their structure and mechanical properties has been theoretically developed and relatively understood[5,6,7,8].
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