Abstract
A range of in-situ y vol% TiC/Fe 1.2 MnCo 0.8 (y = 0, 2.5, 5, 7.5, 10) medium-entropy alloy-based composites were fabricated by vacuum induction melting. The impact of TiC content on the microstructure and mechanical properties of the newly-developed composites was studied. In addition, the strengthening mechanisms were ascertained. Results show that with the TiC content increased, the matrix changed from FCC + HCP dual-phase to FCC single-phase structure, and the composites’ ultimate tensile strength showed a trend of first increasing and then decreasing as well as the percent elongation, while the yield strength and hardness increased steadily. When the content of TiC is less than or equal to 5 vol%, the ultimate tensile strength and percent elongation of the composites are improved in comparison with the Fe 1.2 MnCo 0.8 medium-entropy alloy matrix. Besides, the ultimate tensile strength of the 7.5 vol% TiC/ Fe 1.2 MnCo 0.8 composites reaches the highest 746.5 MPa, which is about 19% higher than that of the Fe 1.2 MnCo 0.8 , but the percent elongation decreases from 50.8% (i.e., the highest value) to 36.4%. The strengthening mechanisms of the composites were considered to be the comprehensive action of Orowan process, solid solution, thermal mismatch and load-transfer effect. The raw/processed data will be available on request.
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