中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 27 No. 9 September 2017 |
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. School of Materials and Engineering, Jiangsu University of Technology, Changzhou 213001, China; 3. BCAST, Brunel University, Uxbridge, Middlesex UB8 3PH, UK）
Abstract:Lattice structure information of heterogeneous nucleation at nucleation interface was present. The crystal orientation, and interfacial structure characteristic of liquid Al alloys nucleated on the basal surface (0001) Al2O3 single crystal substrate were identified by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) analysis. The preferred crystal orientations of pure Al and Al-1%Sb (mass fraction) alloy adjacent to the nucleation interface were examined as (200) and (220) planes of Al, respectively, and two corresponding orientation relationships were obtained. An improved nucleation efficiency and refined grains were attributed to both the reduced interplanar spacing of preferred orientation and the decrease of lattice misfit from 16.4% to 7.0% in Al-1%Sb/Al2O3 nucleation group.
Key words: aluminium alloy; nucleation; interfacial structure; orientation relationship
