Abstract
The microstructure and low cycle fatigue (LCF) behavior of Al 3Zr grain-refined AlZnMg alloy were investigated and compared with those of a large-grained AlZnMg alloy. Improvements in LCF resistance were obtained in the AlZnMgZr by an improved homogeneity of deformation which delayed crack initiation and failure. An overaged microstructure of large η′ and η particles, obtained by aging for 24 h at 150 °C, exhibited the best LCF resistance observed in this study. The improved LCF life of this aging treatment was attributed to the increased homogeneity of slip resulting from the occurrence of dislocation looping as the primary deformation mechanism. The Coffin-Manson parameters vary with the microstructure and deformation behavior of the alloys. Failure of the empirical Coffin-Manson relationship for samples aged for 24 h at 150 °C was related to a change in the capacity of the microstructure to absorb energy prior to crack initiation at high- and low plastic strain amplitudes.
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