دراسة حول تطوير تحضير سبيكة الألمنيوم (8009)‎ و تحسين كفاءة أدائها بإضافة الزركونيوم و المعاملة السطحية

Abstract EN

This work represents an attempt to decrease manufacturing cost and to increase thermal stability and fatigue life of (8009) aluminum base alloy.

The alloys were prepared by a single step die casting followed by rapid cooling (instead of the usual five stages forming).

A microalloying element (Zr) was added.

The study adopted several techniques to improve properties including certain metallurgical variables and mechanical treatments of surfaces.

Several tests were carried out to evaluate the performance of alloys, such as thermal stability, and fatigue strength tests before and after surface mechanical treatments (shot peening by ceramic balls), density measurement and metallographic examination.

Results showed that the prepared alloys are thermally stable.

The addition of (0.2% Zr) was associated with an increase in fatigue strength by (147%) corresponding to the base alloy at low stress cycles (140 MPa) and (93%) at high stress cycles (300 MPa).

Results also showed that a period of (180) seconds for shot peening by ceramic balls gives the best surface mechanical treatments.

An improvement of (150%) and (124%) in fatigue life of (Al-Fe-V-Si-Zr) and (Al-Fe- V-Si) alloys was observed after the surface treatment, when, subjected to low stresses (140 MPa).

At high stresses (300 MPa), however, the improvement was (139%) and (118%) in fatigue life of the alloys respectively.