Surface Segregation Induced Surface Phase Transitions and Equilibrium Forms of Alloy Crystals

本研究探讨了相变诱导的表面 金属合金中溶质的偏析。 的关联的表面 通过实验和建模确定了可扩展性间隙， 随后的相变形态特征。 模型 的过渡与实验结果进行了比较。 模型 合金体系为铜-银，具有选定的合金成分。 一 第二个推力是表面偏析对 合金晶体的平衡形式和相关的表面能。 本研究是在铅铋和铅锡合金上进行的。 这种对表面的研究涉及到各种物理现象 发生在或接近晶体表面，部分地决定了 这些材料的有用特性。 因此，这项研究是 这对材料的持续发展至关重要。

This research examines phase transitions induced by surface segregation of solute in metal alloys. An associated surface miscibility gap is determined by experiment and modeling and the morphological features of the phase transition followed. A model of the transition is compared to experimental results. The model alloy system is copper-silver with selected alloy compositions. A second thrust is on the effects of surface segregation on the equilibrium form of alloy crystals and related surface energies. This research is performed on lead-bismuth and lead-tin alloys. This study of surfaces relates to a variety of physical phenomena occurring at or near crystal surfaces that in part determines the useful properies of such materials. Therefore this research is important to the continued advancement of materials.