Thermodynamics and Crystallography of Interphase Boundaries in Lamellar Solid State Phase Transformations

9102966从动力学和热力学的角度研究了结晶学在珠光体生长中的作用。对耦合珠光体群体生长的数学模型进行了检验。实验数据与热力学和生长动力学模型相结合。利用一种新型的场发射枪透射电子显微镜(FEG-TEM)，测量了发育中菌落的成分梯度。这种方法与三维建模相结合，应该有助于理解片状和简并生长、珠光体和贝氏体相选择以及取向关系等现象。%本研究项目考察了影响金属合金相变的因素。从这样的研究中得出的理解可以应用于广泛的金属合金系统，如钢合金，以改善它们的性能。***

9102966 Shiflet Pearlite growth is investigated with respect to the role of crystallography in the context of kinetics and thermodynamics. The mathematics for coupled pearlite colony growth are examined. Experimental data are coupled to the thermodynamics and models of growth kinetics. With the use of a new Field Emission Gun transmission electron microscope (FEG-TEM), composition gradients in the developing colony are measured. This approach together with three dimensional modeling should assist in understanding phenomena such as lamellar versus degenerate growth, pearlite versus bainite phase selection, and orientation relationships. %%% This research program examines the factors affecting phase transformations in metal alloys. The understanding derived from studies such as this one can be applied to a wide range of metal alloy systems, such as steel alloys, to improve their properties. ***