| In this paper, the mechanical properties and microstructure of three kinds of Al-alloys ZL101, ZL109 and 8# alloy are studied before and after many kinds of cryogenic treatments. Solution heat treatment firstly, and then cryogenic treatment. Find out there are certain relationship between mechanical properties, microstructure and cryogenic treatment processing. Cryogenic treatment has the function of preaging after study the mechanical properties, microstructure and fracture appearances, which have something to do with the numbers of the second phase. XRD affirms that the numbers of the second phase increase after cryogenic treatment. So cryogenic treatment can effectly improve the mechanical properties of Al-alloys materials.
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