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本文用高压电镜研究了锆在高静液压下挤压变形后的显微组织。通过和常规拉拔锆的对照观察,发现静液挤压有促使锆多种变形机构动作的作用。一、孪生易于开动。在直径为20～30μm的细晶粒条件下,变形10％～30％时,可形成大量厚约0.5μm的{10(?)2}型孪晶。二、在横截面上观察到亚带仅宽0.5μm左右的微扭折带群。经过多个～3°的倾侧型小角界面,实现了近二十度的围绕挤压轴向的点阵转动。锆的这种变形机构尚未见过报导。另外,本文描述了用电子衍射研究六方晶系孪晶关系的一种方法。
In this paper, the microstructure of zirconium under high hydrostatic pressure was studied by high-pressure electron microscope. Through the comparison with the conventional drawing zirconium, it was found that the hydrostatic extrusion has the function of promoting the action of various deformation mechanisms of zirconium. First, the twin is easy to start. In the case of fine grain with a diameter of 20-30μm, a large number of {10 (?) 2} twins with a thickness of about 0.5μm can be formed when deformed by 10% ~ 30%. Second, observed in the cross-section sub-band width of only about 0.5μm micro-kink band. After several ~ 3 ° tilt-type small-angle interfaces, a lattice rotation of nearly twenty degrees around the extrusion axis is achieved. Zirconium deformation mechanism has not been reported. In addition, a method of studying the twinning of hexagonal system by electron diffraction is described in this paper.