Porous Bulk Metallic Glass Fabricated by Powder Consolidation

Z.Y. Suo, S.W. Liu, L. Zhang, H. L. Gao, H. Y. Zhang, K. Q. Qiu

School of Materials Science and Engineering, Shenyang University of Technology 110023, CHINA.

DOI: 10.4236/jmmce.2008.72008                

Abstract

A synthesis method for the production of porous bulk metallic glass (BMG) is 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 percentage of amorphous phase of the as-produced porous BMG. The results suggest that the formation of porous structure by superplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. None of crystalline phases was formed during hot pressing, and less than 3.5% percent of residual salt was enclosed in the foam. In order to remove any residual salt particles, salt preform with three-dimensional network and good connectivity is necessary.

Keywords

porous BMG; powder consolidation; hot pressing; placeholders; superplastic forming

Conflicts of Interest

The authors declare no conflicts of interest.

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