The study of the effect of natural aging on some mechanical properties of (Al-Cu)‎ and (Al-Zn)‎ alloys

Abstract EN

The aim of this study is to notice the effect of natural aging on the new alloys and the evaluation of new Al-alloys which consists of the elements of (Zr) & (Te) with an amount of 0.2% for each additive & its comparison with alloy without additive for abase Al-alloy, then measuring their hardness & ultimate tensile strength : 1.As a function of artificial aging temperature at (130oC) and natural aging(15 years) for wrought (Al-Cu) & (Al-Zn) alloys.

2.

For corrosion specimen & oxidation specimen at (300 oC) for wrought and cast alloys with & without additive impurities , so noticed that the effect of natural aging for (15) years (MSc specimen project-1992) on wrought specimen (AL-Zn) alloy is clear and has high rate of both hardness & ultimate tensile strength .This is due to natural aging which leads to precipitate impurities .They resist the movement of dislocation due to high stability alloys , high hardness & high tensile strength, for (Al-Zn) wrought alloy is more than (Al-Cu)wrought alloy .So oxidation specimen test for (Al-Cu) specimen shows high hardness & tensile strength for wrought specimen in a comparison of cast specimen due to special thermomechanical treatment but corrosion specimen test for(Al-Cu)cast specimen has high hardness & high tensile strength due to the changes in heat treatment .

But (Al-Zn) wrought specimen for both oxidation and corrosion tests have hardness & tensile strength which are less than cast specimen for the same alloy.