Crystallization Kinetics Analysis and SPS Consolidation of Mechanical Alloyed Fe₇₉Ti₁₆P₅ Amorphous Powders

Abstract

Amorphous Fe79Ti16P5 alloy powders were synthesized from commercially available elemental powders by mechanical alloying. The microstructure, thermal stability and crystallization kinetic of as-milled powders were analyzed by XRD, SEM and DSC. Moreover, bulk ultrafine-grained materials were fabricated through spark plasma sintering of the amorphous powders. Results show that the amorphous powders exists two exothermal peaks during crystallization process. The effective activation energies for crystallization are obtained 109.14 kJ/mol and 205.97 kJ/mol for Ep1 and Ep2, respectively, by using the Kissinger method. The mechanical properties of the bulk materials are remarkably improved with the increase in the sintering temperatures. The ultimate compressive strength increases from 1282 MPa to 2015 MPa, but absence of ductility.

A study of the evolution of microstructure and consolidation kinetics during sintering using a phase field modeling based approach

“…At lower heating rate, the powder is exposed to elevated temperature for longer duration and hence, density of the material improves. It has also been observed [7] that different mechanical properties including the ultimate compressive strength of a material improves with sintering temperature. As of now the densification kinetics of a powder particles has been captured through experiments only.…”

“…Predicting the consolidation kinetics is a way to quantify evolution of microstructural features into powder material. Mostly consolidation kinetics has been explored for different materials using experiments [7][8][9]. Bruson [8] defined consolidation kinetics of an amorphous powder under warm pressing using effective material viscosity.…”