相衬的基本原理及其应用金相分析要正确鉴别组织,首先应在金相显微镜中能够区分它们。肉眼识别显微组织中的细节要求具有一定的衬度最小值,一般它是由试样反射光的强度差别所形成的。但当试样上两相的反射系数相近,仅有因浸蚀或各相硬度不同抛光时形成的微小凹凸,或 Fundamentals of phase contrast and their applications Metallographic analysis To correctly identify tissues, you should first be able to distinguish them in a metallographic microscope. The details of the microscopic identification of the naked eye require a certain minimum contrast, which is generally due to the difference in the intensity of the reflected light from the sample. However, when the reflection coefficient of the two phases on the sample is similar, only the minute irregularities formed when polishing or different hardness of each phase are polished, or