Aluminium Alloys 1xxx Series Identification Quiz
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Questions and Answers

What is the significance of the last two digits in the alloy numbering system?

  • They signify the type of alloying agent used
  • They represent the alloy's purity level
  • They indicate the alloy's susceptibility to intergranular corrosion
  • They differentiate between different alloys within the same group (correct)

    • Which series of alloys is known for its susceptibility to intergranular corrosion when improperly heat treated?

  • 4xxx Series
  • 3xxx Series
  • 2xxx Series (correct)
  • 1xxx Series

    • What is the principle alloying element in the 3xxx Series of aluminium alloys?

  • Iron
  • Zinc
  • Copper
  • Manganese (correct)

    • Why are aluminium-copper alloys in the 2xxx Series known for greater strength?

    <p>As a result of certain metallic changes in grain structure</p> Signup and view all the answers

    Which two alloys are commonly used in aircraft structures for constructing skins and rivets?

    <p>2017 and 2024</p> Signup and view all the answers

    What features are associated with alloys in the 1xxx Series of aluminium?

    <p>Strain-hardenable, high formability, corrosion resistance, and electrical conductivity</p> Signup and view all the answers

    What is the purpose of solution heat treatment on aluminium alloys?

    <p>To mix the alloying element with the base metal</p> Signup and view all the answers

    Why is it crucial to remove an alloy from the furnace to quench within a specified time?

    <p>To prevent large alloy grains from weakening the alloy</p> Signup and view all the answers

    What happens if excessive precipitation occurs during the cooling process?

    <p>Large grains of alloy weaken the base metal</p> Signup and view all the answers

    How is the cooling rate controlled in the solution heat treatment process?

    <p>By selecting an appropriate quenching medium</p> Signup and view all the answers

    What is the main consequence of not stopping the precipitation process during cooling?

    <p>Formation of large grains that weaken the alloy</p> Signup and view all the answers

    Why is it important to maintain a small tolerance regarding the soaking temperature during solution heat treatment?

    <p>To ensure uniform distribution of alloying elements</p> Signup and view all the answers

    What does the digit following the temper designations H1, H2, and H3 indicate?

    <p>Degree of strain-hardening</p> Signup and view all the answers

    What does the letter O represent in a material's temper designation?

    <p>Annealed state</p> Signup and view all the answers

    What drawback of using magnesium in aircraft structures is overcome by treating the surface with chemicals that form an oxide film?

    <p>High susceptibility to corrosion</p> Signup and view all the answers

    How is the tendency of magnesium to crack when formed typically overcome?

    <p>Heating the parts when forming</p> Signup and view all the answers

    What physical property makes magnesium alloys suitable for use in aircraft structures?

    <p>Low density</p> Signup and view all the answers

    In what form are magnesium alloys available for use in aircraft structures?

    <p>Sheets, bars, tubing, and extrusions</p> Signup and view all the answers

    What should be done to extinguish a fire caused by magnesium?

    <p>Extinguish it with dry sand</p> Signup and view all the answers

    What does solution heat treatment do to magnesium alloys?

    <p>Increases tensile strength, ductility, and resistance to shock</p> Signup and view all the answers

    Why is titanium dioxide conversion needed before using titanium?

    <p>To enhance corrosion resistance</p> Signup and view all the answers

    What characteristic of titanium makes it extensively used in the civilian aerospace industry?

    <p>Excellent resistance to salt water corrosion</p> Signup and view all the answers

    How does artificially aging magnesium alloys after solution heat treatment affect them?

    <p>Increases hardness and yield strength</p> Signup and view all the answers

    What is the recommended method for extinguishing a fire involving magnesium alloys?

    <p>Using dry sand or a dry material that excludes air</p> Signup and view all the answers

    What is the primary metal used for electrical wiring?

    <p>Copper</p> Signup and view all the answers

    Which alloy is commonly used in electrical components for its high conductivity?

    <p>Brass</p> Signup and view all the answers

    Why is beryllium copper identified as a hazardous material in Safety Data Sheets?

    <p>Production of airborne contaminants during grinding</p> Signup and view all the answers

    What is the primary difference between Inconel and stainless steel?

    <p>Appearance</p> Signup and view all the answers

    Which metal is found filling narrow cracks or fissures?

    <p>Copper</p> Signup and view all the answers

    In aircraft construction, which metal has little use as a structural material?

    <p>Copper</p> Signup and view all the answers

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