|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIV
||L-34: Viscous Flow Densification during Spark Plasma Sintering of Fe Based Amorphous Alloy Powder
||Tanaji Paul, Sandip P Harimkar
|On-Site Speaker (Planned)
Spark plasma sintering of Fe48Cr15Mo14Y2C15B6 amorphous alloy powder close to its glass transition temperature (Tg = 575 oC) at a high heating rate of 100 oCmin-1 led to enhanced viscous flow with simultaneous plastic deformation under applied pressure. This resulted in near fully dense compacts while higher temperatures increased stiffening with consequent reduction in densification rate. Following, two discrete stages of densification were revealed with viscous flow confirmed to be the mass transport mechanism upto 585 oC where a maximum densification rate of 0.0011 s-1 was attained. The estimated activation energy, 94.0 kJmol-1 was smaller than during non-isothermal viscous flow in the as cast alloy. Considering the role of heating rate on the above, investigations with 50, 100 and 150 oCmin-1 revealed a steady decrease not only in the temperatures of onset, end and maximum rates of densification but also in the activation energy from 76.2 to 55.2 kJmol-1.
||Planned: Supplemental Proceedings volume