Three-dimensional crystal-melt Wulff-shape and interfacial stiffness in the Al-Sn binary system

作     者：R. E. Napolitano S. Liu 

作者机构：Materials and Engineering Physics Program Ames Laboratory United States Department of Energy Ames Iowa 50011 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2004年第70卷第21期

页      面：214103-214103页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：U.S. Department of Energy, USDOE, (W7405-ENG-82) U.S. Department of Energy, USDOE Basic Energy Sciences, BES Division of Materials Sciences and Engineering, DMSE 

摘      要：The quantitative determination of the three-dimensional Wulff shape for a metallic crystal-melt system is reported here. The anisotropy of crystal-melt interfacial free energy is experimentally measured for the Al–Sn binary system at temperatures of 300 and 500°C. Equilibrium shapes of liquid droplets entrained within the crystalline phase are measured experimentally on sequential two-dimensional sections, and the three-dimensional Wulff plot is reconstructed. For this system, it is found that a single-parameter description of anisotropy is not sufficient, and the anisotropy is reported using the leading terms of the relevant cubic harmonics. Accordingly, the anisotropy coefficients are determined to be ε1=(1.81±0.36)×10−2 and ε2=(−1.12±0.13)×10−2. In addition, the corresponding normal stiffness components as well as a generalized stiffness are quantified and compared with available predictions from atomistic simulations.