Intergrowth mechanism and morphology prediction of faceted Al_(3)Ni formed during solidification by a spatial geometric model  

作　　者：Zongye Ding Qiaodan Hu Wenquan Lu Fan Yang Yihan Zhou Naifang Zhang Sheng Cao Liao Yu Jianguo Li 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai,200444,China [3]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [4]School of Materials,University of Manchester,Oxford Road,Manchester M139PL,UK

出　　处：《Journal of Materials Science & Technology》2020年第19期40-47,共8页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China-Excellent Young Scholars(No.51922068);the National Natural Science Foundation of China(Nos.51727802,51821001,51904186 and 51904187);the Project funded by China Postdoctoral Science Foundation(No.2019M661500);Open Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University(SKLASS 2019-21);the Science and Technology Commission of Shanghai Municipality(No.19DZ2270200)。

摘　　要：The interplay and intergrowth characteristic of faceted intermetallic compounds(IMCs)during solidification was originally investigated through the rod-like Al3 Ni crystals in the liquid Al/solid Ni interconnection by using synchrotron radiography,and the diversified 3-D morphologies were reconstructed by synchrotron tomography.A spatial geometric model was established to effectively predict the diversified growth patterns of two spatial crystals.For the two overlapping Al3 Ni crystals,the impeded crystal growth was divided into three different stages,decided by the hindrance form the other crystal.Further,the groove formed on the crystal surface is directly related to the solute redistribution under the critical condition of boundary layer thickness larger than two crystals distance.The closer distance and smaller crystal size indicate the deeper and larger groove,and the morphology changes from hemispheroid to hemi-ellipsoid with the increased opposite and interacted faces.

关 键 词：SOLIDIFICATION Synchrotron radiography Intergrowth behaviour Intermetallic compounds 3-D morphology 

分 类 号：TG111.4[金属学及工艺—物理冶金]