발간논문

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Vol.18, No.4, 313 ~ 320, 1980
Title
Strengthening Phenomena in Al - Zn - Mg Alloy through Final Thermomechanical Treatment
우기도Kee Do Woo, 이기대Kee Dae Lee, 조현기Hyun Kee Cho
Abstract
An investigation has been carried out to clarify the effects of final thermomechanical treatments(FTMT) on strengthening phenomena in comparison with isothermal and two-step ageing in Al-6.94%Zn-2.69%Mg alloy. Al-6.94%Zn-2.69%Mg alloy processed by FTMT exhibits higher strength than that of conventionally processed. From these results, the super-hardening effects obtained by final thermomechanical treatment may be explained by the interactions between dislocations induced by deformation and precipitates formed by ageing. Deformation less than 30% and final ageing at lower temperature than the solvus temperature of G.P.zones are desirable in obtaining remarkable improvement in mechanical properties by FTMT. The mechanical properties of Al-6.94%Zn-2.69%Mg alloy processed by FTMT exhibit lower strength than those of isothermal and two-step ageing when the temperature of final ageing is higher than the solvus temperature of G.P.zones. Maximum value of 0.2% proof stress resulted by FTMT is 57㎏/㎟, while that resulted by isothermal ageing is 41㎏/㎟.
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