Microstructural morphology and phase structure of rapidly solidified hypereutectic Al-Si alloys
In the present work, rapidly solidified hypereutectic Al-Si-Cu-Mg alloys strips was prepared by single roller melt-spinning method. The microstructures, phase and morphology characteristics of the resultant strips were characterized by means of SEM, TEM and XRD technique. The results show that the grains are refined after rapid solidification processing, and the micro-nanocrystals are formed. Compared with equilibrium solidification, the microstructures are changed obviously. The nucleation and growth of primary silicon are suppressed and primary silicon can not deposited, meanwhile, α-Al phase is nucleated which prior to eutectic. Therefore, the microstructures become into the metastable state. The microstructures of the strips are composed of primary micro-nanostructure α phase and feather-needles-like (α+Si) eutectic which set in the α phase. The mechanism of the formation for microstructures of melt-spinning Al–Si alloy have also been discussed.
rapidly solidification microstructures micro-nanocrystals eutectic like feather-needles metastable state
Wang Aiqin Li Jiwen Xie Jingpei Wang Wenyan
The School of Mater. Sci. & Eng. Henan University of Science and Technology, Luoyang 471003, China
国际会议
青岛
英文
139-142
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）