Effect of powder metallurgy process on the properties of bulk amorphous alloys

The effects of powder metallurgy process parameters on the properties of bulk glass forming alloys are discussed. Amorphous powders can be consolidated into compact bulk amorphous alloys through superplastic forming in the supercooled liquid region. Process parameters such as ram speed V_e, extrusion pressure F, extrusion ratio r and the temperature rise ΔT_e during extrusion that is generated by the work-induced heat have crucial effects on the formability of the alloys and their consequent properties. In contrast to the direct fabricating technique, the powder metallurgy technique can obtain amorphous alloys with larger sizes which are different from those alloys that possess relatively lower glass forming ability (GFA).