Abstract
A systematic study has been made for the aging characteristics of a wide ranged ternary Al-Zn-Mg alloys containing 4-6% Zn and 1-3% Mg. The ternary Al-Zn-Mg alloys have good mechanical properties in the age hardened condition and the resistance to stress corrosion were improved by adding a certain elements such as Cr and Mn. Effects of Zn, Mg, Cr and Mn on the age hardening mechanism by means of dilatometory and X-ray diffraction analyses were investigated.The results abtained are summarized as follows:1) The peak-hardness values decrease with the increase of aging temperature.2) In the Z specimen in which Cr and Mn were added to basemetal, the beginning of age hardening delays.3) In the A and B specimens the manimum-hardness values are obtained at about 250°C treatment.4) The precipitate in specimen containg 4.74% Zn, 1.93% Mg has comporition MgZn2 of which is found to he dÅ=2.43.
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