New ductile laminate structure of Ti-alloy/Ti-based metallic glass composite with high specific strength

Inspired by the aseismic structure of skyscrapers, Ti6Al4V frames with tubular structure were designed, 3D printed and thermoplastic formed with Zr35Ti30Be26.75Cu8.25 bulk metallic glass matrix und...

https://www.tandfonline.com/doi/pdf/10.1080/21663831.2019.1695684

Metal frame reinforced bulk metallic glass composites

Bulk metallic glass (BMG) matrix composites have attracted increasing attentions in the past decades, for combining the superior strength of BMGs with the excellent malleability of crystalline alloys. Insofar, increasing methods have been developed for the fabrication of BMG composites. However, versatile methods capable of fabricating high-performance BMG composites reinforced by diverse secondary phases remain lack. Here, the versatile fabrication of BMG composites reinforced by dissimilar crystalline alloy via ultrasonic vibration-assisted thermoplastic forming was reported. Wire gauze made of 304 stainless steel and Zr-based BMG were chosen as the secondary phase and the matrix, respectively. The as-prepared BMG composites exhibited metallurgical bonding at the interface between BMG and stainless steel, in contrast to the reference sample prepared by normal thermoplastic forming which exhibited merely mechanical bonding. The formation of metallurgical bonding was attributed to the self-cleaning effect induced by ultrasonic vibration which disposed the surface oxidation layer, and the enhanced atomic interdiffusion between BMG and stainless steel by ultrasonic vibration. The fracture toughness of the as-prepared BMG composites exhibited an improvement from 65 to 132 MPa m1/2. Based on fractography observation, the improved fracture toughness was attributed to the deflection of crack at the interfaces between BMG and stainless steel. These results prove the versatility of ultrasonic vibration-assisted thermoplastic forming in the fabrication of BMG composites.

Versatile fabrication of bulk metallic glass composites reinforced by dissimilar secondary phase

Fabrication of Zr-based bulk metallic glass/aluminum alloy multi-materials by stacking extrusion

Diffusion bonding of metallic glasses and crystalline metals utilizing excellent superplasticity of monolithic bulk metallic glasses (BMGs) within supercooled liquid region has been found to be an efficient method to improve the room temperature plasticity and fracture toughness of metallic glass. A Zr-based BMG/copper laminated composite was fabricated by copressing method, and the interface bonding status was characterized by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy. No void or crack is detected, and the interface is a metallurgical bonding of atomistic level. Although the BMG retains amorphous state after copressing at 390 °C, the region of the amorphous-crystalline mixture structure with the width of 30–40 nm occurred within the diffusion zone. Copyright © 2013 John Wiley & Sons, Ltd.

Interface characteristics of a Zr-based BMG/copper laminated composite

Metallic glass / light alloy (MEGA) multimaterials elaborated by co-pressing at high temperature

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Metallic glass / light alloy (MEGA) multimaterials elaborated by co-pressing at high temperature