Precipitation behaviour and mechanical properties of a novel Al0.5MoTaTi complex concentrated alloy

[摘要] The precipitation behaviour in a novel Al0.5MoTaTi complex concentrated alloy (CCA) is described in this study. The alloy was fabricated through an arc-melting process. Solution heat treatment and additional aging was performed at 1673 K and 1273 K, respectively. It was found, that a disordered body-centred cubic phase (bcc) precipitates in cuboidal- and loop-shaped form within an ordered B2 phase. The mechanism of the formation of the loops is believed to be related to the transformation of anti-phase boundaries (APB) in the ordered B2 phase at high temperatures, which act as nucleation sites for the disordered bcc phase during cooling and aging. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

[发布日期] 2019-12-01

[关键词] Complex concentrated alloy (CCA);Scanning/transmission electron microscopy (STEM);Precipitation;Mechanical properties;Anti phase boundaries