Abstract
The objective of this work was to study the effects of several post-sinter processing operations (heat-treatment, sizing, shot peening) on a press-and-sinter 7xxx series aluminum powder metallurgy (PM) alloy. The characterization of the products was completed through a combination of non-contact surface profiling, hardness measurements, differential scanning calorimetry (DSC), transmission electron microscopy (TEM), X-ray diffraction (XRD), tensile, and three-point bend fatigue testing. It was determined that sizing in the as-quenched state imparted appreciable reductions in surface hardness (78 HRB) and fatigue strength (168 MPa) relative to counterpart specimens that were sized prior to solutionizing (85 HRB and 228 MPa). These declines in performance were ascribed to the annihilation of quenched in vacancies that subsequently altered the nature of precipitates within the finished product. The system responded well to shot peening, as this process increased fatigue strength to 294 MPa. However, thermal exposure at 353 K (80 °C) and 433 K (160 °C) then reduced fatigue performance to 260 MPa and 173 MPa, respectively, as a result of residual stress relaxation and in-situ over-aging.
Highlights
Press-and-sinter aluminum powder metallurgy (PM) is an ever-growing industry due to the cost savings associated with high production rates and net shape capabilities coupled with the advantageous strength-to-weight ratio inherent to aluminum alloys
Each process influenced the finished product suchpeening that theoperations following conclusions was studied in this work
≈50 μm to ≈15 μm (Sq), but didreduced not impart measurable change densityconsidered of the finished products
Summary
Press-and-sinter aluminum powder metallurgy (PM) is an ever-growing industry due to the cost savings associated with high production rates and net shape capabilities coupled with the advantageous strength-to-weight ratio inherent to aluminum alloys. All such systems incorporate precipitation hardening as a key strengthening mechanism Within this context, new aluminum PM alloys chemically compliant with the 7xxx series offer high strength-to-weight ratios and are of natural commercial interest. The metastable super saturated solid solution (SSSS) is formed upon quenching from the solutionization temperature It decomposes during natural or artificial aging, through the formation of clusters of solute atoms (so called Guinier–Preston (GP) zones) that eventually transform into the semi-coherent phase η’ and the fully incoherent phase η (MgZn2 ).
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