Bulk metallic glass composites containing B2 phase

High‐Entropy Alloy‐Induced Metallic Glass Transformation: Challenges Posed by in situ Alloying via Additive Manufacturing

“…On the other hand, bulk metallic glass composites (BMGCs) have attracted attention recently since they can provide promising properties by adjusting structure and mechanical response, thereby circumventing the otherwise often observed brittleness of BMGs. [63][64][65][66] Such BMGCs have also been produced by LPBF fabrication. [67,68] Furthermore, Zr-based bulk metallic glasses are suitable for a broad range of applications such as space components, sporting goods, micro-gears, and smart phone cases due to their extreme durability and toughness comparable to high-performance steel.…”

Laser-based additive manufacturing of bulk metallic glasses: recent advances and future perspectives for biomedical applications

“…This is a serious challenge of all BMG systems, which might lead to BMG implant failure, especially when subjected to loading condition [236]. Although efforts have been devoted to enhancing the plasticity and the toughness of the BMGs by reinforcing in-situ second ductile crystalline phase through PBF-LB/M techniques to form BMG composites, the problems of cracks formation, porosities and incomplete powder melting still persist [289,291,337,338]. Therefore, future studies that will focus on fabricating ductile BMGs composites with fully amorphous structure and maintaining the mechanical and biomedical behaviours of biomedical BMGs will be of great interest.…”

Applicability of Pre-Plastic Deformation Method for Improving Mechanical Properties of Bulk Metallic Glasses

“…However, due to the characteristics of long-range disorders and short-range orders in homogeneous macrostructures of BMGs, a highly localized plastic deformation via shear bands usually governs mechanical properties, resulting in catastrophic room-temperature brittleness [ 1 , 2 , 3 , 4 , 5 , 6 ], severely limiting future practical applications as engineering materials. In order to overcome catastrophic fracture and improve the plastic deformability of BMGs, various approaches have been suggested [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ], which are classified into three basic strategies: The first is to create structural heterogeneity by tailoring chemical compositions, cooling rates, cryogenic thermal cycling, elastic loading, and so on [ 7 , 8 ]. The second is to introduce the second crystalline phase into a glassy matrix to prepare BMG composites by heating, manipulating the solidification process, or altering chemical compositions [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

“…In order to overcome catastrophic fracture and improve the plastic deformability of BMGs, various approaches have been suggested [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ], which are classified into three basic strategies: The first is to create structural heterogeneity by tailoring chemical compositions, cooling rates, cryogenic thermal cycling, elastic loading, and so on [ 7 , 8 ]. The second is to introduce the second crystalline phase into a glassy matrix to prepare BMG composites by heating, manipulating the solidification process, or altering chemical compositions [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Among them, the BMG composites containing metastable B2 crystals with transformation-induced plasticity exhibit remarkable tensile plasticity and high strength with an obvious work-hardening effect [ 11 , 12 , 13 , 14 , 15 ].…”

“…The second is to introduce the second crystalline phase into a glassy matrix to prepare BMG composites by heating, manipulating the solidification process, or altering chemical compositions [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Among them, the BMG composites containing metastable B2 crystals with transformation-induced plasticity exhibit remarkable tensile plasticity and high strength with an obvious work-hardening effect [ 11 , 12 , 13 , 14 , 15 ]. The third is to change the deformation conditions or artificially produce macroscopic defects (e.g., notches, holes, shear bands) [ 16 , 17 , 18 ].…”