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Nanoscale Phase Separation of TiZrNbTa High Entropy Alloy Induced by Hydrogen Absorption

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Document pages: 18 pages

Abstract: In this study, the effect of hydrogen on the phase separation of TiZrNbTa high-entropy alloy (HEA) was investigated. When hydrogen was absorbed, phase separation from single body-centered cubic (bcc) phase into a composite of nanoscale Nb(Ta)-rich bcc phase (BCC1) and Ti(Zr)-rich bcc phase (BCC2) was observed. The high resolution transmission electron microscopy (HRTEM) observation showed that the BCC2 phase followed an orientation relationship of (110)BCC2 (110)BCC1, [001]BCC2 [001]BCC1 with BCC1 phase. A coherent BCC1 BCC2 interface together with interface dislocations were also observed. After hydrogen desorption, the separated phases still existed. The mechanism for the H-induced nanoscale phase separation in TiZrNbTa was discussed.

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