About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond IV
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Presentation Title |
F-8: Microstructure and Strengthening Mechanisms of Novel Lightweight TiAlV0.5CrMo Refractory High-entropy Alloy Fabricated by Mechanical Alloying and Spark Plasma Sintering |
Author(s) |
Yu Sun, Fei Gao |
On-Site Speaker (Planned) |
Yu Sun |
Abstract Scope |
Refractory high-entropy alloys (RHEAs) based on the high-melting-point elements have drawn much attention owing to its reasonable ambient temperature ductility, desirable high temperature stability, outstanding oxidation and corrosion resistance. In this work, lightweight TiAlV0.5CrMo RHEA with ultra-fine grains was fabricated by mechanical alloying (MA) and subsequent spark plasma sintering (SPS). The microstructural evolution, mechanical performance and strengthening mechanisms of the alloys in various processing conditions were systematically characterized. A single body-centered cubic (BCC) solid solution phase with nanocrystalline structure was formed. The BCC2 and Al2O3 phases were precipitated from the supersaturated BCC structure. The specimen with an average grain size of ∼0.47 µm and an precipitation phase of less than ∼0.15 µm was obtained, exhibiting micro-hardness of 10.26 GPa, compressive yield strength of 1825 MPa, ultimate compressive strength of 2989 MPa and plastic strain of 17.8% at room temperature. |