Jhong, Meng-JieMeng-JieJhongJen, I-LunI-LunJenWang, Kuang-KuoKuang-KuoWangYen, Wan-TingWan-TingYenHuang, Jacob C.Jacob C.HuangJang, Jason S.-C.Jason S.-C.JangHsieh, Ker-ChangKer-ChangHsiehHSIN-JAY WU2024-09-182024-09-182020https://www.scopus.com/record/display.uri?eid=2-s2.0-85090163620&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/721165論文編號: 100889In recent years the emerge of high-entropy alloys (HEAs) imposes an evolution in metallic materials, which breaks the boundaries set by the traditional alloys. Alongside the development of HEAs, the medium-entropy alloys (MEAs), which comprise two to four majority elements, also reveal the outperforming properties with less compositional complexity. Among them, the medium-entropy AlNbV alloys attract great attention owing to the existence of a body-centered cubic (BCC) solid solution that contains soluble Al, Nb, and V elements. Herein, we construct the phase diagrams for Al-Nb-V system and define the equilibrium homogeneity by thermally-equilibrated ternary alloys underwent a post-annealing at 1073 K or 1273 K. Meanwhile, a superposition of phase diagram and thermal conductivity κ mapping suggests that the coexistence of BCC solid solution and nano-grained AlNb2 brings down the κ. With the incorporation of Ti and Cr, the HEA AlNbVCrTi, which is composed of Laves C14 phase and BCC solid solution, achieves an ultralow κ of 6–10 Wm−1K−1 within 323–723 K. © 2020AlNbVAlNbVCrTiHigh-entropy alloyMedium-entropy alloyPhase diagramThermal conductivityjournal article10.1016/j.mtla.2020.1008892-s2.0-85090163620