一、前言钼作为战略金属的重要性是尽人皆知的。为了研究它的脆断机理,探讨其事故性断裂现象的物理根据,也为了在更广阔的领域扩大高纯难熔金属的应用,满足不断增长的对钼单晶的需求,我们开展了大尺寸定向面钼单晶研究。制取了直径为20～25mm、 First, the preface The importance of molybdenum as a strategic metal is well known. In order to study its brittle fracture mechanism, explore the physical basis of its accidental fracture phenomenon, and to expand the application of high-purity refractory metals in a broader field to meet the ever-increasing demand for molybdenum single crystals, we conducted a large-size Study on Directional Molybdenum Single Crystal. Made of a diameter of 20 ~ 25mm,