一、前言关于钛及钛合金在超低温下组织与性能之间的关系和形变机理问题,对经过简单退火后得到的等轴组织研究得较多,而对经过β-处理后得到的粗大片层状组织却研究得较少。通常,通过β-处理、β-加工、熔焊和铸造等工艺所得到的显微组织,并不是等轴组织,而是保留原始粗大β-晶界的片层状 I. Preface Concerning the relationship between the microstructure and properties of titanium and titanium alloys at ultra-low temperatures and the mechanism of deformation, more and more studies on the equiaxed structures obtained after simple annealing have been carried out. However, the coarse lamellae obtained after β-treatment However, less research organization. In general, the microstructure obtained by such processes as β-treatment, β-processing, welding and casting is not an equiaxed structure but a lamellar form of the original coarse β-grain boundary