![]() ![]() It was one of the first HEAs to be reported to form a single-phase FCC ( face-centred cubic crystal structure) solid solution. The base alloy he developed, equiatomic FeCrMnNiCo, has been the subject of considerable work in the field, and is known as the "Cantor alloy", with similar derivatives known as Cantor alloys. Unaware of Yeh's work, he did not describe his new materials as "high-entropy" alloys, preferring the term "multicomponent alloys". Cantor did the first work in the field in the late 1970s and early 1980s, though he did not publish until 2004. Yeh was also the first to coin the term "high-entropy alloy" when he attributed the high configurational entropy as the mechanism stabilizing the solid solution phase. Ī few months later, after the publication of Yeh's paper, another independent paper on high-entropy alloys was published by a team from the United Kingdom composed of Brian Cantor, I. ![]() Potential applications include use in state-of-the-art race cars, spacecraft, submarines, nuclear reactors, jet aircraft, nuclear weapons, long range hypersonic missiles, and so on. Significant research interest from other countries did not develop until after 2004 when Yeh and his team of scientists built the world's first high-entropy alloys to withstand extremely high temperatures and pressures. Most countries in Europe, the United States, and other parts of the world lagged behind in the development of HEAs. Soon after, he decided to begin creating these special alloys in his lab, being in the only region researching these alloys for over a decade. Development Īlthough HEAs were considered from a theoretical standpoint as early as 19, and throughout the 1980s, in 1995 Taiwanese scientist Jien-Wei Yeh came up with his idea for ways of actually creating high-entropy alloys, while driving through the Hsinchu, Taiwan, countryside. Although HEAs have been studied since the 1980s, research substantially accelerated in the 2010s. įurthermore, research indicates that some HEAs have considerably better strength-to-weight ratios, with a higher degree of fracture resistance, tensile strength, and corrosion and oxidation resistance than conventional alloys. These alloys are currently the focus of significant attention in materials science and engineering because they have potentially desirable properties. ![]() Some alternative names, such as multi-component alloys, compositionally complex alloys and multi-principal-element alloys are also suggested by other researchers. The term "high-entropy alloys" was coined by Taiwanese scientist Jien-Wei Yeh because the entropy increase of mixing is substantially higher when there is a larger number of elements in the mix, and their proportions are more nearly equal. Hence, high-entropy alloys are a novel class of materials. For example, additional elements can be added to iron to improve its properties, thereby creating an iron-based alloy, but typically in fairly low proportions, such as the proportions of carbon, manganese, and others in various steels. Prior to the synthesis of these substances, typical metal alloys comprised one or two major components with smaller amounts of other elements. High-entropy alloys ( HEAs) are alloys that are formed by mixing equal or relatively large proportions of (usually) five or more elements. Alloys with high proportions of several metals Atomic structure model of fcc CoCrFeMnNi ![]()
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