Lamella structure formation in drop-tube processed Ni-25.3 at.% Si alloy

[摘要] Rapid solidification experiments have been performed on an Ni-25.3 at.% Si alloy using drop tube techniques. The dominant phase formed is found to be Ni25Si9, with Ni31Si12 and beta(1)-Ni3Si also being present. SEM and TEM analysis revealed a novel eutectic structure consisting of lamellar of metastable Ni25Si9 and beta(1)-Ni3Si, the width of these being around 200 nm and 20 nm respectively. This result indicates that there is a possible eutectic reaction for the Ni25Si9 and beta(1)-Ni3Si phases existing in the metastable phase diagram. (C) 2014 Elsevier B.V. All rights reserved.

[发布日期] 2014-12-05

[效力级别]  Proceedings Paper

[关键词] Rapid solidification processing;Metastable phase formation;Lamellar structure