WorksheetsProperties of Alloys and Aluminium
Total questions: 20
Worksheet time: 10mins
Evaluate the reasons for using non-ferrous metals in the construction of aircraft.
Non-ferrous metals are cheaper than ferrous metals.
Non-ferrous metals like aluminium and titanium offer a high strength-to-weight ratio, are corrosion-resistant, and allow for fuel efficiency and higher performance.
Non-ferrous metals are heavier and more durable than ferrous metals.
Non-ferrous metals are easier to weld and shape than ferrous metals.
What is Aluminium Alloy 2024 used for, and what are its key alloying elements?
Used in marine applications due to its high corrosion resistance.
Used in aircraft fuselages and structural components due to its high strength and fatigue resistance.
Used in automotive parts for its lightweight properties.
Used in electrical wiring because of its conductivity.
What makes an aluminium alloy suitable for precipitation hardening?
The alloy must contain the right elements like copper, magnesium, or zinc.
The alloy must be pure aluminium without any alloying elements.
The alloy must be heated to a temperature above 1000°C.
The alloy must have a high carbon content.
Why is aluminium used in the manufacture of aircraft fuselages?
It is the cheapest metal available.
It has a high strength-to-weight ratio, making it ideal for aerospace structures where weight savings are critical.
It is highly resistant to corrosion and does not require painting.
It is a good conductor of electricity, which is essential for aircraft systems.
What is Alclad and why is it used with aluminium alloys like 7075 and 2024?
A thin layer of pure aluminium bonded to a high-strength core alloy that improves corrosion resistance.
A type of aluminium alloy that is stronger than 7075 and 2024.
A coating that reduces the weight of aluminium alloys significantly.
A method of welding aluminium alloys together.
What is ageing in precipitation hardening?
A process involving cooling the alloy at a high temperature
A method of reheating the quenched alloy at a lower temperature for a long time
A technique that involves rapid cooling of the alloy
A procedure that eliminates all second-phase particles from the alloy
Discuss the selection of materials used in the construction of aircraft, including a comparison of ferrous and non-ferrous metals.
Ferrous metals are lighter and more corrosion-resistant than non-ferrous metals.
Non-ferrous metals like aluminium and titanium are lighter and more corrosion-resistant, making them preferred in aerospace.
Ferrous metals are always preferred in aerospace due to their strength.
Non-ferrous metals are heavier but stronger than ferrous metals.
What are the alloying elements in Aluminium Alloy 7075?
Zinc (Zn), Magnesium (Mg), Copper (Cu)
Aluminium (Al), Silicon (Si), Iron (Fe)
Nickel (Ni), Titanium (Ti), Manganese (Mn)
Lead (Pb), Bismuth (Bi), Tin (Sn)
What are the alloying elements in Aluminium Alloy 6061 and where is it used?
Copper (Cu) and Zinc (Zn)
Magnesium (Mg) and Silicon (Si)
Iron (Fe) and Manganese (Mn)
Nickel (Ni) and Titanium (Ti)
What is the Hall–Petch relationship?
The Hall–Petch relationship states that as grain size increases, the strength of a metal increases.
The Hall–Petch relationship explains that as grain size decreases, the strength of a metal increases.
The Hall–Petch relationship indicates that grain size has no effect on the strength of a metal.
The Hall–Petch relationship suggests that finer grains lead to more ductility in metals.
Describe the advantages and disadvantages of using aluminium in the construction of transport vehicles.
Lightweight and corrosion resistant, but lower tensile strength than steel.
Very high tensile strength and easy to weld, but heavy and prone to rust.
Inexpensive and easy to work with, but not suitable for high-stress applications.
Highly durable and requires no maintenance, but very difficult to recycle.
What is a second-phase particle in aluminium alloys?
Tiny particles of other elements or compounds that form inside the grains or along grain boundaries.
Large voids that weaken the metal structure.
The primary component of aluminium alloys that determines their color.
A type of defect that enhances the ductility of the metal.
Explain why engineers select non-ferrous metals for applications in the civil structures or transport industries.
Non-ferrous metals are cheaper than ferrous metals.
Non-ferrous metals are heavier and stronger than ferrous metals.
Engineers select non-ferrous metals such as aluminium, copper, and titanium due to their distinct properties.
Non-ferrous metals are more readily available than ferrous metals.
Give 3 examples of non-ferrous metals and their use.
Aluminium – used in planes, cars, power lines;
Iron – used in construction and manufacturing;
Lead – used in batteries and radiation shielding;
Copper – used in wiring and heat exchangers.
Identify two typical applications of aluminium alloys in aircraft and explain why they are used.
Fuselage skins and wing spars
Engine components and landing gear
Cockpit controls and fuel tanks
Cabin insulation and cargo holds
What is a supersaturated solid solution in aluminium alloys?
A solid solution that forms when an alloy is heated and then cooled slowly.
A solid solution that forms when an alloy is heated to dissolve the alloying elements and then quenched quickly to trap those elements inside the aluminium.
A mixture of two or more metals that does not change over time.
A solid solution that is stable and does not form second-phase particles.
Why does Aluminium Alloy 7075 need corrosion protection?
It is resistant to all forms of corrosion.
It contains Copper (Cu) and Zinc (Zn), which can cause galvanic corrosion in moist or salty environments.
It is used in applications where corrosion is not a concern.
It is made from pure aluminium, which does not corrode.
What is dislocation movement and how do alloys affect it?
It's the sliding of layers of atoms. Alloys hinder this, increasing metal strength.
It's the movement of electrons in a metal. Alloys enhance this, reducing metal strength.
It's the arrangement of atoms in a crystal. Alloys have no effect on this.
It's the vibration of atoms in a solid. Alloys decrease this, increasing metal flexibility.
What are the alloying elements in Aluminium Alloy 2024?
Copper (Cu), Magnesium (Mg), Manganese (Mn)
Aluminium (Al), Zinc (Zn), Silicon (Si)
Iron (Fe), Nickel (Ni), Titanium (Ti)
Lead (Pb), Bismuth (Bi), Cadmium (Cd)
Compare the use of aluminium alloys and ferrous metals in transport structures.
Aluminium alloys are heavier and more expensive than ferrous metals.
Ferrous metals are lighter and resist corrosion better than aluminium alloys.
Aluminium alloys are lighter and resist corrosion better than ferrous metals, making them ideal for vehicles and aircraft.
Ferrous metals are stronger but more prone to corrosion than aluminium alloys.
