Overview of aluminum alloy mechanical properties during and after fires

Overview of aluminum alloy mechanical properties during and after fires
Posted by rtyu1yu on 2021/08/24
Overview of aluminum alloy mechanical properties during and after fires

    Overview of aluminum alloy mechanical properties during and after fires

    Aluminum alloys are increasingly being used in a broad spectrum of load-bearing applications such as lightweight

structures, light rail, bridge decks, marine crafts, and off-shore platforms. A major concern in the design of land-based and

marine aluminum structures is fire safety, at least in part due to mechanical property reduction at temperatures

significantly lower than that for steel. A substantial concern also exists regarding the integrity and stability of an

aluminum structure following a fire; however, little research has been reported on this topic. This paper provides a broad

overview of the mechanical behavior of aluminum plates

both during and following fire. The two aluminum alloys discussed in this work, 5083-H116 and 6061-T651, were selected due to

their prevalence as lightweight structural alloys and their differing strengthening mechanisms (5083 – strain hardened, 6061

– precipitation hardened). The high temperature quasi-static mechanical and creep behavior are discussed. A creep model is

presented to predict the secondary and tertiary creep strains followed by creep rupture. The residual mechanical behavior

following fire (with and without applied stress) is elucidated in terms of the governing kinetically-dependent

microstructural mechanisms. A review is provided on modeling techniques for residual mechanical behavior following fire

including empirical relations, physically-based constitutive models, and finite element implementations. The principal

objective is to provide a comprehensive description of select aluminum alloys, 5083-H116 and 6061-T651, to aid design and

analysis of aluminum structures during and after fire.


    The materials included in this study are 5083-H116 and 6061-T651. These alloys were investigated due to their prevalence

as common structural alloys, especially in lightweight transportation and structural applications, and their different

strengthening mechanisms. 5083 is strengthened by strain hardening (cold work). It is a weldable, moderate strength alloy

which exhibits good corrosion resistance in the H116 condition. 6061 is strengthened by precipitation hardening (heat

treatment). It is a weldable, high strength alloy which also exhibits good corrosion resistance. The chemical composition of

the alloys are shown in Table 1.


    A review of the literature devoted to the problem of efficiency of the use of aluminum alloys in automotive structures is

presented. Requirements are formulated on the structure and properties of alloys for cold rolling of car parts. The results

of a study of sheets from AV alloy with a fine-grained recrystallized structure and adaptability to manufacture, which makes

the sheets suitable for automotive panels, and mechanical properties at the level of steel sheets after aging in the process

of drying of the lacquer coating, are presented.


    Aluminum is a very light metal with a specific weight of 2.7 g/cm3, about a third of that of steel. This cuts the costs

of manufacturing with aluminum. Again, its use in vehicles reduces dead-weight and energy consumption while increasing load

capacity. This also reduces noise and improves comfort levels.


    Its strength can be adapted to the application required by modifying the composition of its alloys. Aluminum-magnesium-

manganese alloys are an optimum mix of formability with strength, while aluminum-magnesium-silicon alloys are ideal for

automobile body sheets, which show good age-hardening when subjected to the bake-on painting process.


    Aluminum naturally generates a protective thin oxide coating which keeps the metal from making further contact with the

environment. It is particularly useful for applications where it is exposed to corroding agents, as in kitchen cabinets and

in vehicles. In general, aluminum alloys are less corrosion-resistant than pure aluminum, except for marine magnesium-

aluminum alloys. Different types of surface treatment such as anodising, painting or lacquering can further improve this

property.


    Aluminum is an excellent heat and electricity conductor and in relation to its weight is almost twice as good a conductor

as copper. This has made aluminum the first choice for major power transmission lines. It is also a superb heat sink for many

applications that require heat to be drained away rapidly, such as in computer motherboards and LED lights.


    Aluminum is ductile and has a low melting point and density. It can be processed in several ways in a molten condition.

Its ductility allows aluminum material to be formed close to the end

of the product’s design. Whether sheets, foil, geometrical configurations, tubes, rods or wires, aluminum is up to them all.


    Aluminum foil is only 0.007 mm in thickness, but is still durable and completely impermeable, keeping any food wrapped in

it free of external tastes or smells. It keeps out ultraviolet rays as well.

    Moreover, the metal itself is non-toxic and odorless, which makes it ideal for packaging sensitive products such as food

or pharmaceuticals. The fact that recycled aluminum can be used reduces the carbon footprint for this stage of food and

beverage manufacturers as well.


    Aluminum is 100% recyclable and recycled aluminum is identical to the virgin product. This makes it a much more cost-

effective source material for production runs. The re-melting of aluminum requires little energy: only about 5% of the energy

required to produce the primary metal initially is needed in the recycling process.


    Since the last decades of the 20th century, aluminum

sheet
has proven to be one of the most versatile metallic materials in those applications where weight reduction plays

a fundamental role. The possibility of recycling aluminum alloys an indefinite number of times is another of its great

attractions. Currently, the development of new alloys that improve mechanical properties and corrosion resistance while

maintaining a light weight is one of the important lines of research and development work. At the same time, new processes

are being developed to manufacture better-performing aluminum-based components, overcoming difficulties in casting, the poor

ductility of aluminum alloys at room temperature, and its challenging weldability. Among these processes, solid phase

processing, semi-solid processing, the liquid die forging process, powder metallurgy, sheet hydroforming, incremental

forming, additive manufacturing and friction stir welding and its variants allow for dissimilar joints.

    Many of the advances produced in the design and processing of alloys have been obtained thanks to modeling and simulation

techniques. These techniques make it possible to describe everything from phase diagrams of new compositions based on

thermodynamic calculations to the flow of material during the deformation and forming processes. To face the future

challenges in the aluminum bar, it is necessary to

improve knowledge of the micro- and mesoscopic mechanisms that explain the mechanical behavior of aluminum alloys. A deeper

understanding of these mechanisms is necessary both in components in real use, and during the manufacturing processes.

Additionally, the correlation between aluminum alloy properties and their microstructure must be considered in a unified way

to explain the mechanical behavior in volume and surface and against corrosion.

    In this Special Issue, we openly invite contributions from researchers working on all the different aspects of this

ever-challenging material.

    The present article demonstrates the procedure for fabrication of aluminum alloy 2014 based metal matrix composites

having particulates of silicon carbide as reinforcement. Using the stir casting route, three different compositions of

aluminum alloy metal matrix composites were fabricated. Microstructure of as-cast composites revealed a homogeneous

distribution of silicon carbide particles along with few agglomeration and casting defects. Friction stir processing was

performed to avoid such agglomeration and casting defects present in as-cast composites. The influence of friction stir

processing parameters, that is, rotational speed and transverse speed on metallurgical properties, was investigated. Two

combinations of rotational speed and transverse speed were considered: (i) 270 rpm and 78 mm/min and (ii) 190 rpm and 50

mm/min, respectively. As a result of friction stir processing, the microstructure of processed composites revealed the

presence of fine silicon carbide particles along with the magnificent reduction in grain size. Composites processed with a

rotational speed of 270 rpm and transverse speed of 78 mm/min were found to have higher grain refinement and as a result of

this, the enhancement in microhardness was also observed. Except for a few cases, the average microhardness of all processed

composites under both processed conditions was still lower than that of as–cast composites.


    If you’re like many people, when you hear the word “aluminum”, you think of everyday convenience items that, while

incredibly useful, don’t exactly convey a high-strength image. And it’s true – aluminum is a highly versatile metal –

meaning it can be processed to be thin, lightweight, bendable and even crushable by human hands.


    What’s less well-understood is that aluminum tube

can also be some of the toughest stuff on earth. Often, the metal is used in applications where high-strength and durability

are the most important considerations – from cars and trucks to building material to military vehicles. You likely trust

aluminum to keep you safe and secure dozens of times a day without even knowing it.


    Aluminum is about one-third the weight of steel, meaning parts can be made thicker and stronger while still reducing

weight in vehicles and other applications. Depending on the alloy and processing technique used, pound for pound aluminum can

be forged to be just as strong if not stronger than some steel.

    Aluminum is already the second-most-used material by automakers, so your car or truck likely has a lot of aluminum in it

right now, protecting you from hazards on the road. Engineers know how to work with aluminum to make parts that perform as

well or better than steel parts – all while reducing vehicle weight. Aluminum is highly effective at absorbing crash energy,

protecting passengers in the event of an accident. And lighter aluminum vehicles improve performance.  Better handling

and shorter stopping distances help drivers avoid accidents to begin with.

    Aluminum is used for window frames and curtain wall in some of the world’s tallest skyscrapers – maybe even the office

building you’re sitting in right now. This versatile metal is used to make planes, trains, buses, trucks – even ocean

liners!

    In short, every day, people around the world trust the strength of aluminum – whether they know it or not.


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