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Thermal stability and mechanical properties of Fe-Cr-Zr alloys developed by mechanical alloying followed by spark plasma sintering

Muthaiah, VMS and Koch, CC and Mula, S (2021) Thermal stability and mechanical properties of Fe-Cr-Zr alloys developed by mechanical alloying followed by spark plasma sintering. In: Journal of Alloys and Compounds, 856 .

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Official URL: https://doi.org/10.1016/j.jallcom.2020.158266


The present work aims to investigate (i) the feasibility of formation of Fe-7Cr-xZr and Fe-15Cr-xZr (x = 0.25, 0.5 and 1 at%) disordered solid solutions by mechanical alloying (MA) and (ii) their thermal stability and mechanical properties of spark plasma sintered (SPSed) samples. Effect of Zr addition on phase evolution in Fe-Cr-Zr alloy and its influence on their thermal stability and mechanical properties (microhardness and compression strength) have been studied in detail. Transmission electron microscopy-selected area diffraction pattern (TEM-SAED) and X-ray diffraction (XRD) phase analysis confirm the formation of complete solid solution after 25 h of MA. Grain size was observed to stabilize significantly within nanometer range after annealing at 600–1200 °C. The SPSed (at 1000 °C) samples showed the best combination of hardness (9.4 GPa) and compressive strength (ultimate compressive strength-2200 MPa and yield strength-1800 MPa) corresponding to an average grain size of<100 nm. This is due to the strengthening mechanisms of grain boundary strengthening (owing to solute segregation and solute drag effect), precipitation hardening (Zener pinning) by Fe2Zr phase and excellent densification achieved by SPS.

Item Type: Journal Article
Publication: Journal of Alloys and Compounds
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to Elsevier Ltd.
Keywords: Age hardening; Chromium alloys; Chromium metallography; Compressive strength; Grain boundaries; Grain size and shape; Hardness; High resolution transmission electron microscopy; Iron metallography; Mechanical alloying; Mechanisms; Plasma stability; Solid solutions; Spark plasma sintering; Ternary alloys; Thermodynamic stability; Zircaloy; Zirconium metallography, Average grain size; Compression strength; Disordered solid solution; Grain boundary strengthening; Selected area diffraction patterns; Solute drag effects; Strengthening mechanisms; Ultimate compressive strength, Iron alloys
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 21 Feb 2023 03:14
Last Modified: 21 Feb 2023 03:14
URI: https://eprints.iisc.ac.in/id/eprint/80521

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