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材料显微结构定量金相学术报告

报告题目:显微结构中边界的平均积分曲率-意义、用途、及测量

报告人:Patterson博士

时间:6月14日(星期二)上午10:00-12:00

地点:大学城校园工学二号馆205机电工程学院会议室

报告人简介:

Dr. Burton Roe Patterson is an adjunct research professor in the Department of Materials Science and Engineering at the University of Florida. He is a Fellow of ASM International. He also served as the Professor in the Department of Materials Science and Engineering at the University of Alabama at Birmingham. His research covers Physical Metallurgy, Powder Metallurgy, Quantitative Microscopy, and Microstructural Processes. He has published more than 100 technical papers.

                    Integral mean curvature of boundaries in microstructures

                         -its meaning, usefulness and measurement

                                  Burton R. (Pat) Patterson

                         Department of Materials Science and Engineering

                                      University of Florida

                                      Gainesville, FL 32611

The integral mean curvature of grain boundaries, Ms, is the key geometric term relating grain size and local boundary mean curvature to the rate of volume growth or shrinkage of individual grains. Though Ms is an important term in many physical processes such as coarsening and grain growth, its physical meaning is not intuitive and this talk will attempt to describe its nature and value in theory and experiments and its measurement. Four methods for measuring Ms have been developed by different authors over the past five years, with different theoretical and experimental approaches as well as different image processing requirements and most applicable structure, e.g., smoothed or voxelated. Two methods require full three-dimensional information about grain surfaces while one requires only identification of the 3D face or size class on a 2D examination plane. Recent comparisons of these techniques on the same images have shown fairly good comparison and similar sensitivity per effort expended. All are now automatable to allow higher numbers of measurements and improved sampling.  The availability of these multiple methods for measuring Ms will enable more rigorous examination of boundary curvature-based growth theories.

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