Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

TL;DR

This study investigates how localized pore evolution driven by atomic mobility influences densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy, revealing the role of localized Joule heating in achieving high density.

Contribution

It introduces the concept of localized pore evolution facilitated by atomic mobility as a key factor in densification during spark plasma sintering of nanocrystalline W-Mo alloy.

Findings

Localized pore evolution enhances densification.

Densification achieved to ~95% density.

Localized Joule heating influences pore behavior.

Abstract

The present work reports the role of different atomic mobility induced localized pore evolution on densification during spark plasma sintering of nanocrystalline W-Mo alloy powder. The shrinkage (or expansion) behavior of cold compacted milled powders was studied using dilatometry during non-isothermal sintering up to 1600 {\deg}C. Subsequently, the milled powders were densified to ~95% relative density using spark plasma sintering up to 1600 {\deg}C. The enhanced localized Joule heating due to dynamically evolved porous structure could be attributed for the densification during spark plasma sintering.