9/26/2023 0 Comments High entropy alloysGludovatz B, Hohenwarter A, Catoor D (2014) A fracture-resistant high-entropy alloy for cryogenic applications. Gludovatz B, Hohenwarter A, Thurston K, Bei HB, Wu ZG, George EP (2016) Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures. Gao MC, Yew JW, Zhang Y (2016) Design of High-Entropy Alloys. Miracle DB, Senkov ON (2017) A critical review of high entropy alloys and related concepts. Yeh JW, Chen SK, Lin SJ, Gan JY, Chin TS, Shun TT, Tsau CH, Chang SY (2004) Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. In addition, the future trends and some problems faced by HEAs at cryogenic temperature are discussed, and prospects of HEAs are put forward.Ĭantor B, Chang TH, Knight P, Vincent AJB (2004) Microstructural development in equiatomic multicomponent alloys. We discuss how individual deformation mechanisms can compete or operate synergistically with each other during cryogenic temperature plastic deformation, including dislocation slip, strain-induced twin formation and strain-induced phase transformation. The research and development of tensile, compressive and fracture toughness of HEAs at cryogenic temperature are briefly reviewed. In this paper, the effects of different phase structure, grain size and stacking fault energy (SFE) on cryogenic temperature deformation behavior are reviewed. It is important to study their deformation behavior and microstructural evolution at cryogenic temperature to provide the understanding needed for further alloy development. Therefore, HEAs have potential applications in cryogenic temperature structural materials. The extensively investigated HEAs exhibit excellent strength–ductility combination and excellent damage resistance at cryogenic temperature. These HEAs exhibit unique composition design and structural characteristics leading to excellent properties, which have attracted considerable attention in various fields. We are continuing development of these alloys and their heat treatment schedules using small arc melted billets.High-entropy alloys (HEAs) are multi-component alloys with a novel designed concept. We have shown that some of these refractory alloys exhibit remarkably little hardening due to irradiation. These are of interest for nuclear applications particularly if composition provides for low activation under high energy neutron irradiation. The second class of alloys we work on are refractory metal based HEAs. Current interests in Oxford focus on alloy compositions adapted from the equiatomic Cantor alloy, and effects of advanced processing methods on microstructures and properties. Since then the Cantor alloy has recieved a large amount of interest and been shown to have an attractive combination of strength, ductility and toughness, along with interesting nano-twinning deformation mechanism. However, they identified the five element FeCrMnNiCo system as being predominantly a single fcc phase which solidifies dentrically. Work by the Cantor group in Oxford in the early 2000's looked at 16 - 20 element systems but found they were typically multiphase and brittle. Our focus has been on two classes of HEAs: Cantor Alloy based systems, and Refractory alloys. Although the early hypothesis that high configurational entropy might act to stabilise a single phase in such systems has generally been rejected, research has stimulated activity that has revealed a rich seam of novel highly alloyed crystalline metallic systems that possess outstanding mechanical performance. The so-called high-entropy alloys (HEAs) are a novel class of alloys developed in the early 2000s which do not contain a single major constituent metallic element.
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