Abstract
Al10Cr25Co20Ni25Fe20 high-entropy alloys (HEA) with ultrafine grains was synthesized through 30 h of mechanical alloying (MA). The morphological study of prepared high-entropy alloy powders was done by using scanning electron microscope images. Crystallite size and lattice strain of prepared high-entropy alloy were investigated through x-ray diffraction technique. Consolidation and sintering of HEA powders done by two methods such as conventional sintering and spark plasma sintering methods at 1000° and 1200 °C. After 30 h of MA, crystallite size 44 nm and lattice strain 0.182 was obtained. The mechanical properties analysis of high-entropy alloy was done in terms of its density, hardness measurements and compression test. For conventional sintering, the hardness values of 135 ± 6 HV0.5 for 1000 °C and 186 ± 8 HV0.5 for 1200 °C were obtained. For spark plasma sintering, the hardness values of 167 ± 5 HV0.5 for 1000 °C and 212 ± 6 HV0.5 for 1200 °C was obtained. Ultimate compressive strength for conventional sintering at 1000 °C and 1200 °C was 246 ± 5 MPa and 305 ± 6 MPa. Ultimate compressive strength of HEA for spark plasma sintered composite at 1000 °C and 1200 °C was 369 ± 5 MPa and 442 ± 5 MPa and the total elongation was 17.7%. BCC and FCC biphase mixture was obtained and confirmed by transmission electron microscopy images and electron backscattered diffraction analysis.
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Acknowledgment
This research work was supported by the seed money grant (Grant No:1018/Registrar/2022-23/Date:10.10.2022) received from the Management of the Periyar Maniammai Institute of Science & Technology, Thanjavur, Tamil Nadu, India.
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Jeyasimman, D., Vijayaraghavan, V. & Venkateshwara, S. Synthesis and Characterization Study of Al10Cr25Co20Ni25Fe20 High-Entropy Alloy Powders through Mechanical Alloying. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09667-1
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DOI: https://doi.org/10.1007/s11665-024-09667-1