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为使高速钢高温形变组织中的弥散析出碳化物的复型图象有较好的衬度,本文通过理论推导得出提高复型衬度的途径是适当腐蚀样品提高相邻区域的厚度差,采用小孔径物镜光阑成象,用原子序数大的重金属投影,在较低的加速电压下观察样品。在国产DXA4—10透射电镜下及在带有TE附件的扫描电镜下对萃取复型样品在低加速
In order to make the compound images of dispersed precipitated carbide in the high temperature deformation of high-speed steel have a good contrast, this paper deduces by theoretical derivation that the way to improve the complex-type contrast is to properly corrode the samples to increase the difference of the thickness of adjacent areas, Using a small aperture objective diaphragm imaging, with a heavy atomic number of heavy metal projection, observed at lower accelerating voltage samples. In the domestic DXA4-10 transmission electron microscopy and with a TE attached to the scanning electron microscope extract complex samples in the low acceleration