Recent developments in ductile bulk metallic glass composites

Abstract

Offering a unique suite of mechanical, physical, and chemical properties, bulk metallic glasses (BMGs) show significant promise as engineering materials. Unfortunately, most BMGs exhibit low tensile ductility at ambient temperature that limits their use as structural (load-bearing) materials. To overcome this problem, BMG composites (BMGCs) containing a second phase are being developed for improving ductility by controlling the mechanics of shear band nucleation and growth in the glassy matrix, which is the primary mode of failure in these materials. This review describes some recent developments in BMGCs and discusses the influence of the type of second phase on mechanical behavior.

Production, Mechanical Properties and Biomedical Characterization of ZrTi-Based Bulk Metallic Glasses in Comparison with 316L Stainless Steel and Ti6Al4V Alloy

“…It was shown in several research papers [ 15 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 79 , 80 ] that bulk metallic glasses exhibit excellent mechanical properties, such as high hardness and low Young’s modulus. In this paper, the mechanical properties were investigated on a microscale by applying nanoindentations tests.…”

“…The disordered internal structure of BMGs results in significant changes in physical properties, such as high hardness and strength [ 15 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ], low elastic modulus [ 15 , 31 , 32 ], low macroscopic range of plastic deformations [ 33 , 34 ], and a high range of elastic deformations exceeding 2% [ 22 , 26 , 27 ], which subsequently leads to an increase in the elastic to total deformation energy ratio. From the point of view of potential application, the mechanical parameters of the metallic glasses mentioned above result in high resistance to scratching and abrasive wear [ 35 , 36 , 37 , 38 , 39 ].…”

Metallic glass matrix composites

“…Generally, BMGs and MGMCs exhibit softening under tensile loading at room temperature, even though they display a large compressive fracture strain [86][87][88][89][90]. During the past 15 years, there are many such dendrite / MGMCs successfully designed, which exhibit the macroscopic ductility and high strength at room temperature, together with the high thermal stability of the glass matrix [91], which include the dendrite / Zr-based [86][87][88][89][90][92][93][94][95][96][97], dendrite / Ti-based [98][99][100][101][102][103][104][105], dendrite / Co-based [106], dendrite (flake) / Mg-based [107], dendrite / La-based [108,109], dendrite / LaCe-based [110], and dendrite / Fe-based MGMCs [111,112].…”

Tensorial description of the plasticity of amorphous composites

“…In the case of plastic materials, there is a finite shear strength that is macroscopically supported by the sample and can be taken as an example of a mechanical property that can be optimized. For instance, to reinforce a metallic glass, one possibility is to introduce some amount of a ductile phase [2,3]. This was shown to be effective in controlling the appearance of shear bands, thus preventing the nucleation of cracks.…”