The structural evolution of initial single-crystal {110} Мо during high pressure torsion at 573 К has been investigated by scanning and transmission electron microscopy. Two stages of the structure formation have been found. At the first stage, the single-crystal transforms into the polycrystal with a {110} weak texture. At the second stage (е ≥ 4), the average grain size is constant (about 0.5 μm) due to dynamic recrystallization. An increase in the gradient of an internal grain orientation (grain orientation spread) after the maximally-achieved true strain (е = 7.1) indicates the high defectiveness of the dynamically-recrystallized structure and, as a result, a rise in the hardness of Mo.

通过扫描和透射电子显微镜研究了在573К高压扭转期间初始单晶{110}Мо的结构演变。已经发现结构形成的两个阶段。在第一阶段，单晶转变为具有弱{110}织构的多晶。在第二阶段（≥4），由于动态再结晶，平均晶粒尺寸恒定（约0.5μm）。在达到最大真实应变（е  = 7.1 ）之后，内部晶粒取向的梯度（晶粒取向扩展）的增加表明动态再结晶组织的缺陷率很高，结果，Mo的硬度增加。