발간논문

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Vol.35, No.7, 849 ~ 855, 1997
Title
Investigation of the Best Condition for the Thermomechanical Treatment on the Optimum Mechanical Propertes
이덕희 , 남수우 Duck Hee Lee , Soo Woo Nam
Abstract
It is well known that a newly developed Al-Zn-Mg-Mn alloy has high strength and ductility with excellent weldability. However, comparing the mechanical properties between the extruded and the rolled alloys containing 0.8wt.% Mn, the extruded alloy with fine fibrous grain structure is shown to have higher strength than that of the rolled one consisting of coarse equiaxed grains In this study, the effect of themomechanical treatment on the tensile min the rolled Al-Zn-Mg-Mn. alloy containing 0.8wt.% Mn has been studied. Even though the grain size of 30% cold rolled and recrystallized alloys(ITMT-30 alloys) was coarser than that of 60% cold rolled and recrystallized alloys(ITMT-60 alloys), it was found that the tensile properties of ITMT-30 alloys was higher. It can be explained by the hardening effect by substructure as well as grain size refinement. The final thermomechanical treatment(FTMT) of the rolled alloy improves remarkably yield strength and tensile strength with good ductility as compared with only T6 treated rolled alloy. The strength of FTMT treated alloy is compatible to the extruded Al-Zn-Mg-Mn alloy. Increase of the strength is related to the precipitation hardening and the work hardening effect by FTMT.
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