快速凝固Al-Li合金的低循环疲劳断裂行为

Study on Fracture Mechanism of Low-Circle Fatigue in Rapidly Solidified Al-Li Alloy

利用德国 ｓｃｈｅｎｃｋ疲劳试验机对快速凝固Ａｌ－Ｌｉ合金进行了低循环疲劳试验研究。得到了 σ－Ｎ循环硬化／软化曲线。并对低循环疲劳断口形貌进行了分析，确定了其裂纹源形成的主要原因。为该合金的进一步完善指明了方向。

Using Germany Schenck servhydraulic machine, Low-circle fatigue was carried out in different Strain ranges. The σ-N curve and parameters of fatigue were measured. In addition, SEM was used to discover the reason of formation of crack.