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Abstract
This study aims to clarify the influence of the Spark Plasma Sintering (SPS) method on structural morphology, mechanical properties and also functional characteristics, such as hydrogen absorbing properties, for titanium-iron intermetallic compounds. We could synthesize B2-TiFe phase using mechanical alloying (MA) during 3 h and SPS treatment of 5 min at 500–1000 °C, which was confirmed by XRD and Electron Probe Microanalyzer (EPMA) measurements. In addition, the synthesized TiFe intermetallic compound has been found to absorb hydrogen with high kinetics in both high pressure Differential Scanning Calorimetry (DSC) and Pressure-Composition-Temperature (PCT) measurements. Therefore, we have successfully developed TiFe alloy in bulk form from initial raw powders by using a combination of short period mechanical alloying and SPS heat treatment. This combined route enhances the potential of the SPS method to synthesize new materials.
Highlights
The hydrogenation properties of Titanium-Iron compound, a typical AB-type alloy with B2 structural prototype, were first determined by Reilly in 1974 [1,2,3]
We have investigated the combination of mechanical alloying (MA) and Spark Plasma Sintering (SPS) treatments for the synthesis of
After 3 h, the mean particle size is about 10 μm, and some particles remain facetted keeping the initial aspect of the powder
Summary
The hydrogenation properties of Titanium-Iron compound, a typical AB-type alloy with B2 structural prototype, were first determined by Reilly in 1974 [1,2,3]. The widespread use of TiFe intermetallic compound is hampered by the necessity to perform a rigorous activation treatment It requires a cyclic procedure of heating up to 673 K in a vacuum, cooling down to room temperature, and pressurizing hydrogen to up to 4 MPa [5]. This procedure must be repeated over ten times to complete its full activation. This treatment of TiFe has been improved by many groups [5,6]
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