アルミニウム合金溶湯鍛造材の低サイクル疲労寿命の検討

概要

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In this study, low cycle fatigue life of squeeze cast aluminium alloy (AC4CH) was investigated. Fatigue life in AC4CH was shorter than that in its matrix material (A6061-T6) by approximately onethird. To clarify the cause of decrease in fatigue life, three controlling factors for low cycle fatigue life were compared. The results obtained are as follows : (1) Fracture in AC4CH starts from a high density zone of eutectic silicon particles that exists on the neighboring surface ; thus, the crack initiation length in AC4CH is longer than that in A6061-T6. (2) Fracture ductility in AC4CH is small and preexisting cracks originate from other eutectic silicon particles ; thus, the crack propagation limit length in AC4CH is shorter than that in A6061-T6. (3) The crack propagates in the interface between eutectic silicon particles and matrix ; thus, the crack growth rate in AC4CH is faster than that in A6061-T6.
一般社団法人日本機械学会の論文
1999-12-25