Aluminum Alloys in Aerospace

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What is the result of using Al–Li–Cu alloys in the fuselage frames of the F16?

A 50% reduction in fatigue life and a 10% increase in weight

No change in fatigue life and a 20% reduction in weight

A two-fold increase in fatigue life and weight

A three-fold increase in fatigue life and a 5% reduction in weight (correct)

What is the purpose of the heat-treatment process in age-hardenable aluminum alloys?

To increase the hardness of the alloy

To decrease the Young’s modulus of the alloy

To reduce the weight of the alloy

To achieve the high mechanical properties required for aero structures (correct)

What is the sequence of operations in the heat-treatment process?

Quenching, artificial ageing, solution treatment

Quenching, solution treatment, artificial ageing

Solution treatment, quenching, artificial ageing (correct)

Artificial ageing, solution treatment, quenching

Which of the following properties is not improved by the heat-treatment process?

Young’s modulus Signup and view all the answers

What is the purpose of solution treatment in the heat-treatment process?

To dissolve any large precipitates present in the metal after casting Signup and view all the answers

Which alloy is used in the fuselage and lift frame of the EH 101 helicopter?

8090 Al Signup and view all the answers

What is the primary purpose of annealing a material?

To alter its physical and chemical properties to make it more workable Signup and view all the answers

What is the main reason why non-age-hardenable alloys are limited in their use in aircraft structures?

They lack the strength, fatigue resistance and ductility needed Signup and view all the answers

What determines the strength of non-age-hardenable alloys?

Solid solution strengthening, strain hardening and grain size control Signup and view all the answers

What is the typical proof strength of most tempered non-age-hardenable alloys?

Below 225 MPa Signup and view all the answers

What is the purpose of temper designation systems in aluminium alloys?

To denote the basic temper and its subdivisions Signup and view all the answers

Which alloys cannot be age-hardened via heat-treatment processing?

1000, 3000, 5000 and most of the 4000 alloys Signup and view all the answers

What is the primary purpose of age-hardening aluminum alloys?

To obtain the strength needed for use in highly loaded structures Signup and view all the answers

Which aluminum alloy series is characterized by high strength, fatigue resistance, and toughness?

2000 series Signup and view all the answers

What is the primary alloying element in the 2000 series aluminum alloys?

Copper Signup and view all the answers

Aluminum Alloys in Aerospace

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Questions and Answers

What is the result of using Al–Li–Cu alloys in the fuselage frames of the F16?

What is the purpose of the heat-treatment process in age-hardenable aluminum alloys?

What is the sequence of operations in the heat-treatment process?

Which of the following properties is not improved by the heat-treatment process?

What is the purpose of solution treatment in the heat-treatment process?

Which alloy is used in the fuselage and lift frame of the EH 101 helicopter?

What is the primary purpose of annealing a material?

What is the main reason why non-age-hardenable alloys are limited in their use in aircraft structures?

What determines the strength of non-age-hardenable alloys?

What is the typical proof strength of most tempered non-age-hardenable alloys?

What is the purpose of temper designation systems in aluminium alloys?

Which alloys cannot be age-hardened via heat-treatment processing?

What is the primary purpose of age-hardening aluminum alloys?

Which aluminum alloy series is characterized by high strength, fatigue resistance, and toughness?

What is the primary alloying element in the 2000 series aluminum alloys?

Which of the following alloys is used in aircraft fuel tanks, fairings, oil tanks, and wing tips?

What is the primary application of the 4000 series aluminum alloys?

What is the composition of the alloy 5052 Al?

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