Investigation the effect of aging time and quenching on the surface residual stress of Al-Cu-Li 2198 alloy

the focus of this paper is on the effect of quenching and aging parameters on the surface residual stress of theAluminum- lithium AA2198 alloy which was measured by XRD technique. The results show that surface residual stresscan be decreased by controlled-quenching. In normal quenching, the as-quench residual stress (> -350 MPa) is morethan 3 times higher than controlled-quenching (≈ -100 MPa). However, aging time does not affect surface residualstress significantly and just decreases 18% for both normal and controlled quenching after reaching peak hardness.

Keywords:

Controlled-quenching , XRD technique , residual stress , AA2198