Warpage Behavior of 7075 Aluminum Alloy Extrusions

Abstract

Extruded I sections of 7075-T6 aluminum were machined into four different sections shapes: L, short depth L, T, and short depth T. The furnace was preheated to 416°C (780°F) and the samples were placed inside. The temperature was raised to 471°C (880°F) and then the samples were quenched in either a 30% polyalkylene Glycol solution or water, both at 15°C (59°F). Points on the distorted samples were recorded before and after the solution treatment; the difference between the measurements indicated the extent of warpage.

The Effect of Quenching in Polymer and Addition of 0.1% Zr on Properties of Al-5.6% Zn-2.5%Mg-1.6%Cu Alloy

“…Warpage can be minimized by adding polymer to water quenchants to reduce the convective or film coefficient between the parts and the water. These synthetic quenchants retard the heat transfer from the components surface and reduce the temperature differential between different thicknesses of the material [5].…”

“…= -742.6 mV From Figs. (3-5) and (3-6) we obtained that value of corrosion current density at 150 °C of A alloy (quenched in 30% polyethylene glycol) decreased by (326 % ) in comparison to the base alloy ( quenching in water).The value above indicates these alloy quenched in PAG have resistance corrosion best (A) alloy quenched in water because the alloy quenched in 30% polyethylene glycol the precipitates are uniformly distributed throughout the whole grain and these precipitates have higher efficiencies than those that accumulate along the grain boundaries perhaps because of greater breakdown of the passive oxide network.Fig (3)(4)(5)(6)(7). shows that B alloy (quenched in water) have :…”

Análise de corrosão e comportamento mecânico de ligas de alumínio aeronáutico 7075-T6 após tratamento térmico usando a técnica >i<uphill>/i<

“…Assim, uma outra forma de se conseguir bons resultados com a redução de tensão residual em tratamento térmico de ligas de alumínio pode ser através da substituição de fluido de têmpera usual de água pela mistura de certa concentração de polímero com água com o objetivo de atenuar o gradiente de temperatura (Es-Said et al, 2007). (2008), a principal vantagem do endurecimento por precipitação está no incremento de limite de escoamento do material.…”