一种高断裂韧性铝锂合金的断裂特征

Fracture Feature of High-Toughness Al-Li Alloys

发现了铝锂合金的一种罕见的断裂韧性加载曲线及相应的“楼梯状”断裂断口，具有这种“楼梯状”断口的合金其断裂韧性值很高，本文用裂纹桥理论及裂纹偏转与阻力曲线的关系对楼梯状断口的形成进行了研究及解释．

A rare load-time curve of fracrure toughness and its concurent stairlike fracture topograph are explored after a great amount of research work. The alloys with this kind of charactor have high fracture toughness values. A theory of crack bridge and the relationship between crack deflection and resistance curve are introduced to explain the machanics of formation of stair-like fracture.