详细研究并讨论了钛合金高温形变强韧化机理．结果表明，三态组织中少量等轴α相与基体β相没有固定的位向关系，位错容易找到可开动的滑移面，对变形起着协调作用，因而合金具有较高的塑性；大量网篮交织的条状α，不仅增加了相界面，提高了合金的强度与抗蠕变能力，而且不断改变裂纹扩展方向，导致裂纹路径曲折、分枝多，断裂韧性好．新的变形理论适用于α，近α，（α＋β）和近β型钛合金． Studied and discussed in detail the mechanism of high temperature deformation and toughening of titanium alloy. The results show that a small amount of equiaxed α phase does not have a fixed orientation relationship with β phase in the three-state microstructure, dislocations can easily find a gliding surface that can be actuated, which plays a coordinating role in the deformation. As a result, the alloy has higher plasticity. The interlacing strip α of the basket not only increases the phase interface, improves the strength and creep resistance of the alloy, but also continuously changes the direction of the crack propagation, resulting in the crack path twists and turns with more branches and better fracture toughness. The new theory of deformation applies to α, near α, (α + β) and near β-type titanium alloys.