Synergetic strengthening of layered steel sheet investigated using an in situ neutron diffraction tensile test

Synergetic strengthening induced by plastic strain incompatibility at the interface, and the resulting extra geometrically necessary dislocations (GNDs) generated during plastic deformation, were investigated to understand the origin of extra strength in heterogeneous structured (HS) materials. The mechanism of extra GND generation in twinning-induced plasticity (TWIP)-interstitial free (IF) steel layered sheet was quantitatively analyzed by conducting in situ neutron scattering tensile test. Load partitioning due to the different mechanical properties between the TWIP-steel core and IF-steel sheath at the TWIP/IF interface was observed during the in situ tensile testing. Because of the plastic strain incompatibility from load partitioning, extra GNDs are generated and saturate during tensile deformation. The extra GNDs can be correlated with the back-stress evolution of the HS materials, which contributes to the strength of layered materials. Because of the back-stress evolution caused by load partitioning, the strength of TWIP-IF layered steel is higher than the strength estimated by the rule-of-mixtures. This finding offers a mechanism by which extra GNDs are generated during load partitioning and shows how they contribute to the mechanical properties of HS materials.11Ysciescopu

Towards ferrous medium-entropy alloys with low-cost and high-performance

This article introduces a practical and straightforward strategy to take a paradigm shift in the high-entropy alloys (HEAs) and medium-entropy alloys (MEAs) design concept from equiatomic alloys towards cost-effective ferrous medium-entropy alloys (FeMEAs). Upon deviating from the equiatomic composition in Fe-containing alloy system, we show that various FeMEAs can be developed by pseudo-binary methods. Further, we discuss an overview of the microstructural evolution and mechanical properties of recently-developed FeMEAs, which exhibit a broad spectrum of microstructures and mechanical properties. This viewpoint article highlights insights into the concept of FeMEAs, providing a potential direction for future development of HEAs and MEAs. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.11Nsciescopu

보론이 도핑된 CoCrFeMnNi 고엔트로피합금의 인장 특성에 관한 연구

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Investigation on the synergetic strengthening of twinning-induced plasticity + interstitial free hybrid steel

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Streth-flangeability of Fe-based medium-entropy alloys

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Effect of initial grain size on deformation mechanism of VCrMnFeCoNi high-entropy alloy processed by high-pressure torsion

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Strain Rate effects of Dynamic Compressive Deformation on Mechanical Properties and Microstructure of CoCrFeMnNi High-entropy Alloy

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면심입방구조 단결정 및 다결정 하이엔트로피 합금의 기계적 특성과 고용 강화 모델링

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Gradient-structured ferrous medium-entropy alloys with enhanced strength-ductility synergy by ultrasonic nanocrystalline surface modification

In this study, gradient-structured Fe-x(CoNi)(90-x)Cr-10 ferrous medium-entropy alloys were fabricated by using an ultrasonic nanocrystalline surface modification process. The processed alloys with gradient structures exhibited the improved room-temperature yield strength by up to 158% and tensile strength by up to 31% at reasonable ductility compared to homogeneous microstructured counterparts.11Nsciescopu

Phase-transformation strengthening of ferrous medium-entropy alloys at cryogenic temperatures

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