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International Journal of Minerals, Metallurgy and Materials

Corresponding Author

Keqiang Qiu1*

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

Keywords

porous bulk metallic glass; hot pressing; placeholders; superplastic forming

Abstract

A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the superplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were employed to characterize the morphologies of foaming structure, the crystallization and the percentage of crystallization of the as-produced porous BMG. The results suggested that the formation of porous structure by superplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. Less than 6.5% of crystalline phases were formed during hot pressing, and less than 5.5% of residual salt was enclosed in the foam. To remove any residual salt particles, salt preforms with three-dimensional network and good connectivity is necessary.

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