Trivia Quiz On Aluminium Alloy Properties! Ultimate Questions

1. 1XX.X designation is given to ___________ type of aluminium alloys.

Wrought

Cast

Copper containing

Silicon containing

The correct answer is "Cast." The 1XX.X designation is given to cast type of aluminum alloys. This designation system is used to classify and identify different types of aluminum alloys based on their composition and properties. The cast type alloys are specifically designated with the 1XX.X series, indicating that they are cast aluminum alloys.

Explanation

The correct answer is "Cast." The 1XX.X designation is given to cast type of aluminum alloys. This designation system is used to classify and identify different types of aluminum alloys based on their composition and properties. The cast type alloys are specifically designated with the 1XX.X series, indicating that they are cast aluminum alloys.

2. Iron in Al alloys is usually kept below ________ .

1%

2%

3%

4%

Iron is usually kept below 1% in Al alloys because iron can have negative effects on the properties of the alloy. It can decrease the ductility and corrosion resistance of the alloy, and can also lead to the formation of undesirable intermetallic compounds. Therefore, it is important to keep the iron content low in order to maintain the desired properties of the Al alloy.

Explanation

Iron is usually kept below 1% in Al alloys because iron can have negative effects on the properties of the alloy. It can decrease the ductility and corrosion resistance of the alloy, and can also lead to the formation of undesirable intermetallic compounds. Therefore, it is important to keep the iron content low in order to maintain the desired properties of the Al alloy.

3. During widmanstatten structure formation, new phase is formed which is characterised by:

Needle shaped

Plate shaped

Rod shaped

Boat shaped

During widmanstatten structure formation, a new phase is formed which is characterized by needle-shaped structures. This refers to the formation of elongated crystals or grains that have a needle-like appearance. This structure is commonly observed in certain metallic alloys, particularly those that undergo a slow cooling process. The needle-shaped crystals are a result of the diffusion of atoms during the cooling process, leading to the formation of distinct microstructures.

Explanation

During widmanstatten structure formation, a new phase is formed which is characterized by needle-shaped structures. This refers to the formation of elongated crystals or grains that have a needle-like appearance. This structure is commonly observed in certain metallic alloys, particularly those that undergo a slow cooling process. The needle-shaped crystals are a result of the diffusion of atoms during the cooling process, leading to the formation of distinct microstructures.

4. Stress corrosion cracking is observed in ___________ alloys.

Work hardened

Strain hardened

Precipitation-hardened

Debris hardened

Stress corrosion cracking is a type of corrosion that occurs in certain alloys when they are exposed to a combination of tensile stress and a corrosive environment. Precipitation-hardened alloys, also known as age-hardened alloys, are alloys that have been heat-treated to achieve a high strength through the precipitation of fine particles within the material. These alloys are susceptible to stress corrosion cracking due to the presence of these fine particles, which can act as sites for crack initiation and propagation. Therefore, stress corrosion cracking is observed in precipitation-hardened alloys.

Explanation

Stress corrosion cracking is a type of corrosion that occurs in certain alloys when they are exposed to a combination of tensile stress and a corrosive environment. Precipitation-hardened alloys, also known as age-hardened alloys, are alloys that have been heat-treated to achieve a high strength through the precipitation of fine particles within the material. These alloys are susceptible to stress corrosion cracking due to the presence of these fine particles, which can act as sites for crack initiation and propagation. Therefore, stress corrosion cracking is observed in precipitation-hardened alloys.

5. Which of these is unused in 4-digit designation of aluminium alloys?

3XX.X

4XX.X

5XX.X

6XX.X

The 4-digit designation system for aluminum alloys is used to classify different alloys based on their composition and properties. The first digit represents the main alloying element or group of elements, while the second and third digits indicate the specific alloy within that group. The "6XX.X" designation is not used in this system, suggesting that there are no specific aluminum alloys classified under this category.

Explanation

The 4-digit designation system for aluminum alloys is used to classify different alloys based on their composition and properties. The first digit represents the main alloying element or group of elements, while the second and third digits indicate the specific alloy within that group. The "6XX.X" designation is not used in this system, suggesting that there are no specific aluminum alloys classified under this category.

6. Magnesium decreases __________ of Al alloys.

Machineablilty

Weldability

Density

Ductility

Magnesium decreases the density of Al alloys.

Explanation

Magnesium decreases the density of Al alloys.

7. A1 is the type of age hardenable alloys where:

Both the temperatures of the quench bath and the aging process are above the GP solvus

Both the temperatures of the quench bath and the aging process are below the GP solvus

The GP zone solvus lies in between the temperatures of the quench bath and the aging process

A1 is the type of age hardenable alloys where both the temperatures of the quench bath and the aging process are above the GP solvus. This means that the quench bath temperature and the aging process temperature are higher than the temperature at which the GP zone dissolves. This is important because it allows for the formation and stabilization of the desired precipitates during the aging process, leading to increased strength and hardness of the alloy.

Explanation

A1 is the type of age hardenable alloys where both the temperatures of the quench bath and the aging process are above the GP solvus. This means that the quench bath temperature and the aging process temperature are higher than the temperature at which the GP zone dissolves. This is important because it allows for the formation and stabilization of the desired precipitates during the aging process, leading to increased strength and hardness of the alloy.

8. Aluminium has __________ modulus of elasticity.

Low

High

Medium

Semi-lastic

Aluminium has a low modulus of elasticity. Modulus of elasticity refers to the stiffness or rigidity of a material. A low modulus of elasticity means that aluminium is relatively flexible and can be easily bent or deformed under stress. This property makes aluminium suitable for applications where flexibility and lightness are desired, such as in the aerospace industry or in the construction of vehicles.

Explanation

Aluminium has a low modulus of elasticity. Modulus of elasticity refers to the stiffness or rigidity of a material. A low modulus of elasticity means that aluminium is relatively flexible and can be easily bent or deformed under stress. This property makes aluminium suitable for applications where flexibility and lightness are desired, such as in the aerospace industry or in the construction of vehicles.

9. Stiffness of beam is proportional to (d = thickness of the beam)

E and d²

E² and d²

E and d³

E² and d³

The stiffness of a beam is directly proportional to the product of the modulus of elasticity (E) and the cube of the thickness (d³) of the beam. This means that as the modulus of elasticity and the thickness of the beam increase, the stiffness of the beam also increases.

Explanation

The stiffness of a beam is directly proportional to the product of the modulus of elasticity (E) and the cube of the thickness (d³) of the beam. This means that as the modulus of elasticity and the thickness of the beam increase, the stiffness of the beam also increases.

10. T10 temper represents :

Solution heat treated, then aged artificially

Solution heat treated, then stabilized (overaged)

Solution heat treated, cold worked, then aged artificially

Cooled from an elevated-temperature shaping process, artificially aged, then cold worked

The T10 temper represents a specific heat treatment process for a material. In this case, the material is first cooled from an elevated-temperature shaping process, which could involve processes like casting or forging. After cooling, the material is artificially aged, which involves subjecting it to a controlled heat treatment to improve its strength and hardness. Finally, the material is cold worked, which means it is deformed at room temperature to further enhance its mechanical properties. This sequence of steps, from cooling to artificial aging to cold working, is what defines the T10 temper.

Explanation

The T10 temper represents a specific heat treatment process for a material. In this case, the material is first cooled from an elevated-temperature shaping process, which could involve processes like casting or forging. After cooling, the material is artificially aged, which involves subjecting it to a controlled heat treatment to improve its strength and hardness. Finally, the material is cold worked, which means it is deformed at room temperature to further enhance its mechanical properties. This sequence of steps, from cooling to artificial aging to cold working, is what defines the T10 temper.