Phase and microstructure pattern selection of Zn-rich Zn-Cu peritectic alloys during laser surface remelting

被引:4
|
作者
Su, Yunpeng [1 ,2 ]
Lin, Xin [1 ]
Wang, Meng [1 ]
Huang, Weidong [1 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Geneus Technol Chengdu Co Ltd, Chengdu 610049, Peoples R China
基金
国家重点研发计划;
关键词
RAPID SOLIDIFICATION; UNIDIRECTIONAL SOLIDIFICATION; EUTECTIC GROWTH; DIRECTIONAL SOLIDIFICATION; MORPHOLOGICAL STABILITY; INTERFACIAL STABILITY; LAMELLAR STRUCTURES; SPACING SELECTION; PLANAR INTERFACE; COUPLED GROWTH;
D O I
10.1007/s10853-021-06199-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Peritectic solidification has attracted increasing attention as a lot of important binary alloys, such as Fe-Ni, Zn-Cu, Fe-C and Ti-Al, exhibit peritectic reaction during solidification. In order to investigate the solidification behavior of Zurich Zn-Cu peritectic alloy containing nominally up to 7.8 wt.% Cu, a series of laser surface remelting experiments were performed. With the increase in growth velocity, Zn-Cu alloys with Cu content below 3.0wt.% showed an evolutional sequence from low-velocity eta planar interface -> lamellar structures -> eta shallow cells and finally to high-velocity eta planar interface. The Zn4.0 wt.%Cu alloy showed a similar transitional sequence except that irregular cells appeared when low-velocity planar interface became unstable. In contrast, epsilon cell/dendrite was the typical microstructure of the Zn-7.8 wt.% Cu alloy within the whole scanning velocity range. Based on the maximum interface temperature criterion, a eutectic growth model under rapid solidification conditions (TMK model) and a self-consistent numerical model for the cellular and dendrite growth were applied to establish a phase and microstructure pattern selection map, which drew a clear whole picture of the relationship between phase/microstructure and solidification conditions of this series of alloys. Regarding the microstructure feature, our investigation revealed the range of the solidification velocity and chemical composition of lamellar structures as dominant microstructure and their lamellar spacing displayed a considerable range of the average value as a function of growth velocity. The relationship between the lamellar spacing and the growth velocity was further analyzed by using the TMK eutectic model, and the results showed the same overall trend as the experimental results. [GRAPHICS] .
引用
收藏
页码:14314 / 14332
页数:19
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