Porous bulk metallic glass fabricated by powder hot pressing

Keqiang Qiu1), Bo Yu2), and Yinglei Ren1) 1) School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China 2) Shenyang Research Institute of Foundry, Shenyang 110022, China

摘 要：A synthesis method for the production of porous bulk metallic glass （BMG） was introduced. This method utilizes the su- perplastic 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 dif- ferential 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 su- perplastic 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 re- sidual salt particles, salt preforms with three-dimensional network and good connectivity is necessary.

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