title: On oscillatory microstructure during cellular growth of directionally solidified Sn-36at.%Ni peritectic alloy.
abstract: An oscillatory microstructure has been observed during deep-cellular growth of directionally solidified Sn-36at.%Ni hyperperitectic alloy containing intermetallic compounds with narrow solubility range. This oscillatory microstructure with a dimension of tens of micrometers has been observed for the first time. The morphology of this wave-like oscillatory structure is similar to secondary dendrite arms, and can be observed only in some local positions of the sample. Through analysis such as successive sectioning of the sample, it can be concluded that this oscillatory microstructure is caused by oscillatory convection of the mushy zone during solidification. And the influence of convection on this oscillatory microstructure was characterized through comparison between experimental and calculations results on the wavelength. Besides, the change in morphology of this oscillatory microstructure has been proved to be caused by peritectic transformation during solidification. Furthermore, the melt concentration increases continuously during solidification of intermetallic compounds with narrow solubility range, which helps formation of this oscillatory microstructure.
authors.affiliation: Institute of Materials Science and Engineering, Lanzhou University, Lanzhou, China.|School of Physical Science and Technology, Lanzhou University, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Peng
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, China.
authors.forename: Xinzhong
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Materials Science and Engineering, Lanzhou University, Lanzhou, China.|School of Physical Science and Technology, Lanzhou University, China.
authors.forename: Jiangong
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, China.
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Su
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, China.
authors.forename: Jingjie
authors.initials: J
authors.lastname: Guo