Abstract
High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.
Highlights
Developing multicomponent metallic alloys with superior properties has played a vital role in the advancement of human civilizations since the Bronze Age
We focus on very recent results about phase stability and transitions under high pressure and provide a brief review of the relevant experimental methods, issues, and perspectives for future study
The size of the Diamond anvil cells (DACs) anvil culets is typically small with a diameter of approx. 500 μm to 20 μm depending on the target maximum pressure
Summary
By mixing five or more elements with equimolar or near-equimolar ratios, the system could be stabilized in a single phase solid-solution by their maximized configurational entropy [1,2] Since this new class of so-called high-entropy alloys (HEAs) has attracted considerable attention and research interests. Phase transitions between three different prototype polymorphs with fcc, hcp, and bcc structures were extensively studied in iron [25,26,27]. The Ce3 Al system is of particular interest, where a pressure-induced intermetallic compound and metallic glass to fcc solid solution transitions were discovered due to the significant reduction of the difference between both the atomic radii and electronegativity of Ce and Al during compression [42,49]. We focus on very recent results about phase stability and transitions under high pressure and provide a brief review of the relevant experimental methods, issues, and perspectives for future study
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