Spark plasma sintering versus hot pressing – densification, bending strength, microstructure, and tribological properties of Ti5Al2.5Fe alloys

Abstract

Ti5Al2.5Fe alloys were fabricated by the spark plasma sintering (SPS) and hot pressing (HP) pressure-assisted sintering techniques from pre-alloyed powders with a particle size of about 200 μm. The powders were sintered at 850 °C for two different holding times (5 and 8 min) and heating rates (50 and 150°C min −1 ) at 25 MPa. The maximum relative densities were 99.70 and 98.78% for SPS and HP samples, respectively. All the alloys prepared by the SPS process had significantly higher bending strengths (1825-2074 MPa) than the alloys prepared by the HP process (648-1330 MPa). A decrease in the heating rate from 150 to 50°C min −1 enhanced the wear resistance of the Ti5Al2.5Fe alloys prepared by both the SPS and HP processes.

Advances in half-Heusler alloys for thermoelectric power generation

“…80,81 The choice of pressing method should be expected to have an effect on the properties of the sample, with literature comparisons in other material systems showing significant differences in optical, thermal and mechanical properties. [82][83][84]…”

Theoretical and Experimental Study of CaMgSi Thermoelectric Properties

“… 13 Consolidating milled powders by the spark plasma sintering (SPS) technique has several advantages over HP since SPS was originally designed to inhibit the grain size and provide a better densification. 14 The phase diagram of Ca–Mg–Si was calculated by Gröbner et al using the Calphad method. 15 The potential applications of CaMgSi have motivated studies in the field of hydrogen storage and biodegradable implants.…”

“…Poudel et al made nanocomposites with the addition of Sb by mechanical milling (MM) and hot pressing (HP), reaching a value of ZT = 1.4 at 373 K, which is a good value for low-temperature applications, but it could still be improved . Consolidating milled powders by the spark plasma sintering (SPS) technique has several advantages over HP since SPS was originally designed to inhibit the grain size and provide a better densification . The phase diagram of Ca–Mg–Si was calculated by Gröbner et al using the Calphad method .…”

Evaluation of Wear and Corrosion Behaviour of Hybrid Sintered Ti₆Al₄V Alloy

“…Mean COF of applied load of 8 N was observed to be 0.257 and 10 N had the mean COF of 0.357. This suggests that the sample is highly resistant to wear and it has the tendency of exhibiting the lowest wear rate [12]. Furthermore, there is likelihood for the emergence of an oxide layer as the counterface material slides on the sample at applied load of 5 N with the mean COF of 0.156.…”