Glass-Forming Ability and Crystallization Behavior of Al86Ni9La5 Metallic Glass with Si Addition

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• 作者：Jiaojiao Yi ; Wanqiang Xu ; Xianzhong Xiong ; Lingti Kong ; Micheal Ferry and Jinfu Li
• 刊名：Advanced Engineering Materials
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：18
• 期：6
• 页码：972-977
• 全文大小：807K
• ISSN：1527-2648

文摘

The glass-forming ability (GFA) of (Al₈₆Ni₉La₅)_100−xSi_x alloys, where x = 0.0, 0.2, 0.5, 1.0 and 2.0, were determined with the crystallization behavior of these alloys. As the Si content increases, the GFA reaches a maximum at x = 0.2 and then continuously decreases. The thermal stability of the metallic glass is also deteriorated owing to the Si addition, which is accompanied by a gradual disappearance of the glass transition in the DSC traces. It is demonstrated that the peak in GFA at x = 0.2 is due to the increase in atomic packing efficiency while the deterioration of GFA at larger x is related to the chemical action between Si and other elements, which leads to a heterogeneous amorphous structure and a significant increase in microhardness at x = 0.5.