Abstract
AbstractThe effect of precipitate free zones (PFZs) on the low cycle fatigue (LCF) life of an Al–4·70 wt-%Zn-2·80 wt-%Mg alloy at room temprature was investigated. The alloy used in the present study was uniquely prepared to have different widths of PFZ, whlle keeping the distribution and size of predominant precipitates in the matrix or on grain boundaries almost constant. As the width of the PFZ increased from 0·073 to 0·3 μm,the LCF life was observed to increase to some extent. However, the tensile properties such as yield strength, tensile strength, and elongation remained approximately unchanged. Studies using transmission electron mlcroscopy show that the extent of planar slip decreases with increasing PFZ width throughout cyclic deformation. Thls result suggests that the increase in LCF life is probably due to relaxation of the local stress in the soft PFZ regions.MST/2093
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