Abstract
A series of high entropy alloys (HEAs), AlxNbTiMoV, was produced by a vacuum arc-melting method. Their microstructures and compressive mechanical behavior at room temperature were investigated. It has been found that a single solid-solution phase with a body-centered cubic (BCC) crystal structure forms in these alloys. Among these alloys, Al0.5NbTiMoV reaches the highest yield strength (1,625 MPa), which should be attributed to the considerable solid-solution strengthening behavior. Furthermore, serration and crackling noises near the yielding point was observed in the NbTiMoV alloy, which represents the first such reported phenomenon at room temperature in HEAs.
Highlights
Traditional metallic alloys typically include one or two principal elements and have been studied for many years
All major diffraction peaks are identified as belonging to a typical body-centered-cubic (BCC) solid-solution phase, which indicates that adding Al to this kind of High entropy alloys (HEAs) has little effect on the phase formation
When the ratio of Al increases to 1.5, several minor peaks consistent with ordered phases appear in the X-ray diffraction (XRD) pattern of the Al1.5NbTiMoV alloy
Summary
Traditional metallic alloys typically include one or two principal elements and have been studied for many years. It is well known that the addition of small amounts of other elements to these systems may improve their mechanical properties, but if large amounts of other elements are added, this may result in complicated intermetallic compounds and lead to brittleness, and can deteriorate their properties. A new alloy design concept that breaks the traditional principles of alloy design has been studied. High entropy alloys (HEAs), which were proposed by Yeh et al [1,2], have attracted considerable attention around the World. HEAs contain five or more principal elements in equal or near-equal atomic ratios, in which all the atomic concentrations are between 5% and 35%, and none of them should be over 50%. Different from the traditional alloys that form complex phases, HEAs may form simple solid-solution structures like the face-centered cubic (FCC) and body-centered cubic (BCC)
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