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The medium entropy alloys (MEAs) composed of high-melting-point, low-activation elements often demonstrate favorable mechanical properties and reduced activation required for nuclear applications. In this work, novel low activation MEAs of FeCr2V and FeCr2VW0.1 as potential nuclear structural materials have been developed. Thermodynamic calculation was used to guide the MEA design. The materials were fabricated using arc melting and their microstructure and mechanical properties were investigated. The results show that the developed MEAs are characterized by a dual-phase microstructure consisting of both body-centered-cubic (BCC) phases. The as-fabricated FeCr2VW0.1 exhibits improved hardness (average nano-hardness 9.6 GPa) compared with FeCr2V (7.4 GPa), owing to the enhanced solid solution strengthening (SSS) and precipitation strengthening (PS). Meanwhile, after doping with W, the compressive ultimate strength and yield strength of MEAs increased by about 15.7 % and 13.7 %, respecti ....
An extra low carbon martensitic stainless steel with 16% ultrafine grained metastable reverted austenite was subjected to uniaxial tensile testing and investigated with in-situ energy-dispersive synchrotron X-ray diffraction (XRD) and in-situ electron backscatter diffraction (EBSD) to reveal the complex interplay between stress, strain and martensitic transformation. In-situ XRD demonstrated that, upon surpassing the yield strength, the fraction of reverted austenite declined linearly with increasing true stress, which was associated with transformation-induced plasticity (TRIP). EBSD and XRD consistently showed that the texture of martensite evolved from an initially weak texture towards a strong 110α′ fiber parallel to the tensile axis. For the first time, stress partitioning between (remaining) reverted austenite and the martensite matrix was determined quantitatively during in-situ XRD by averaging over the stress values obtained from lattice strains for multiple reflections. Ma ....