期刊
MATERIALS CHARACTERIZATION
卷 194, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112387
关键词
Amorphous alloys; Crystallization; Microstructure; Chemical heterogeneity
类别
资金
- National Natural Science Foundation of China [51620105012, 51821001]
This paper investigates the effect of Si addition on the crystallization behavior by preparing a series of (Al86Ni9Y5)100-xSix (x = 0, 1, 2, 3, 4, 5) amorphous ribbons. The results show that Si addition enhances the chemical heterogeneity and promotes the abnormal crystallization of α-Al. However, with the increase of Si content, the crystallization of Al3Ni and Al3Y advances, leading to the disappearance of the abnormal crystallization.
In this paper, a series of (Al86Ni9Y5)100-xSix (x = 0, 1, 2, 3, 4, 5) amorphous ribbons were prepared to study the effect of Si addition on the crystallization behavior. The amorphous microstructure of Al86Ni9Y5 base alloy is essentially heterogeneous. When it is subjected to annealing, primary alpha-Al nanocrystals first precipitate in the Al -rich regions and then regrow in the residual amorphous matrix at a far higher temperature, resulting in two separate primary crystallization events, called as abnormal crystallization. Addition of Si to the base alloy principally enhances the chemical heterogeneity, due to which more alpha-Al crystals precipitates with a lower onset temperature and crystallization activation energy. Meanwhile this abnormal crystallization of alpha-Al is promoted when x <= 3. The largest temperature interval between two crystallization peaks of alpha-Al is up to 154 K. As more Si is added, however, the crystallization of Al3Ni and Al3Y is advanced, causing the vanishment of the abnormal crystallization. The strong interaction between different species of solute atoms and the existence of free Al atoms are responsible for the occurrence of the abnormal crystallization.
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