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The densification and grain growth behavior of powder injection molded 316L stainless steel micro–nanopowder were investigated in terms of microstructural development. The sintered density of the micro–nanopowder sample increased remarkably in the temperature range of 1000 to 1100 °C due to the sintering effect of nanopowders which increased the number of grain boundaries acting as high material transport path. A near full density of 98% TD was obtained after sintering at 1100 °C for 5 h with the average grain size less than 10 μm, indicating that there was no drastic grain growth. The presence of nanopowders in micro–nanopowder played decisive role in the entire sintering process by enhancing densification but suppressing grain growth. These effects open up the possibility of using micro–nanopowder feedstock to control the sintering behavior of powder injection molding products with full density and fine microstructure. [ABSTRACT FROM AUTHOR]

The primary objective of this study was to produce a TiVNbZrHf high-entropy alloy through powder metallurgy process and characterize its properties. The effect of sintering temperature on the microstructure and mechanical properties of bulk TiVNbZrHf samples was investigated. The resulting microstructure of the bulk samples included two different phase structures: a body-centered cubic (BCC) phase with a composition rich in (Ti-V-Nb)-Hf and a hexagonal close-packed (HCP) phase with a composition rich in (Hf-Zr)-Ti. The particle size and relative density of the bulk sample increased with the rising sintering temperature. The bulk TiVNbZrHf sample exhibited the highest hardness and the lowest wear rate when sintered at 1400 °C. The corrosion resistance of the bulk samples submerged in a 3.5 wt% NaCl solution steadily improved with increasing sintering temperatures. This improvement is attributed to the increased relative density and diminished grain boundaries. Our research highlights the crucial role of precise temperature control during the sintering process to achieve the desired material properties of high-entropy alloys. [Display omitted] • Bulk TiVNbZrHf high entropy alloy was synthesized by powder metallurgy process. • Alloy shows a dual-phase structure: body-centered cubic and hexagonal close-packed. • The highest hardness and the lowest wear rate were observed in the alloy at 1400 °C. • A better corrosion resistance of alloy was achieved at higher temperature (≥1400 °C). [ABSTRACT FROM AUTHOR]