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So far, the aluminium alloys are more often used in applications that were in past devoted mainly to steelbased materials. This is allowed by a good combination offering sufficient strengths while reducing the overall weight since the aluminium-based alloys are in general characterized by a relatively low density [1-7]. The group of Al alloys commonly described as AA6xxx belongs to the materials most widely utilized for production of a wide branch of products, mainly by hot-extrusion, which also includes firefighter ladders. They are usually used for different profiles in the construction industry, in aerospace [8-10] and automotive industry (chassis frame in Volvo, Jeep and BMW 5-series, body panels) [2, 11, 12] as well as it is suitable for the production of different decorative objects due to relatively easy anodization. The alloys are low-alloyed with Mg and Si in total amounts of only a few tenths of a percent. The low content of alloying elements increases the strength and hardness due to the formation of Mg2Si precipitates and simultaneously increase the welding capability of these alloys [8, 13]. The alloys in this group are usually prepared by melting and quick casting that suppress the undesirable segregation of alloying elements. Consequentially, a homogenization annealing is implemented to reduce any undesirable microsegregation within the ingot. The prepared alloy is then preheated and hot extruded through the working tool with a shape of a future product. Prepared profiles are then thermally treated which consist of solution annealing consequential rapid water quenching and slow artificial ageing to increase the mechanical properties due to precipitation of Mg2Si particles within the αAl grain interior. Since the process of thermal treatment tends to yield the maxima in properties, the change in temperature as well in a duration of the process may significantly influence the resulting properties. Considering the typical application of firefighter ladders, subsequential exposure to elevated temperatures might completely change the properties of such crucial equipment leading to potentially life-threatening situations. Therefore, present work describes the influence of elevated temperatures onto the microstructure and mechanical properties of two firefighter ladders both made of AA6063 alloy.

Firefighter Ladders Made of AA6063 Alloy Exposed to Elevated Temperatures and its Influence onto Mechanical Properties