Banding structure formation during directional solidification of Pb-Bi peritectic alloys

Xiao Wu Hu, Shuang Ming Li, Fan Rong Ai, Hong Yan

科研成果: 期刊稿件文章同行评审

2 引用 (Scopus)

摘要

Directional solidification experiments on Pb-Bi peritectic alloys were carried out at very low growth rate (v=0.5 μm/s) and high temperature gradient (G=35 K/mm) in an improved Bridgman furnace. The banding structures were observed in both hypoperitectic and hyperperitectic compositions (Pb-xBi, x=26, 28, 30 and 34). Tree-like primary α phase in the center of the sample surrounded by the peritectic β phase matrix was also observed, resulting from the melt convection. The banding microstructure, however, is found to be transient after the tree-like structure and only the peritectic phase forms after a few bands. Composition variations in the banding structure are measured to determine the nucleation undercooling for both α and β phases. In a finite length sample, convection is shown to lead only to the transient formation of bands. In this transient banding regime, only a few bands with a variable width are formed, and this transient banding process can occur over a wide range of compositions inside the two-phase peritectic region.

源语言英语
页(从-至)2131-2138
页数8
期刊Transactions of Nonferrous Metals Society of China (English Edition)
22
9
DOI
出版状态已出版 - 9月 2012

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