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Aviation Alloys Identification Quiz
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Aviation Alloys Identification Quiz

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Questions and Answers

What is the significance of digits 1 through 9 in identifying alloy modifications?

  • Serve to distinguish different alloys within a series (correct)
  • Represent specific alloying elements
  • Indicate the number of alloys in a group
  • Have no special meaning, only serving for identification

    • Which is a key characteristic of alloys in the 1xxx series?

  • Non-corrosive properties
  • High formability and electrical conductivity (correct)
  • Heat-treatable
  • High strength and hardness

    • What is the primary alloying agent used in the 2xxx series of aluminium alloys?

  • Zinc
  • Copper (correct)
  • Manganese
  • Magnesium

    • Why are aluminium-copper alloys susceptible to intergranular corrosion?

    <p>Improper heat treatment</p> Signup and view all the answers

    Which element serves as the primary alloying element in the 3xxx series of aluminium alloys?

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

    Among the most commonly used aluminium-copper alloys in aircraft structures, which are used for skins and rivets?

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

    Which series of aluminium alloys is alloyed with silicon and magnesium?

    <p>5xxx Series</p> Signup and view all the answers

    What characteristic makes 4xxx Series aluminium suitable for welding and brazing?

    <p>Low melting temperature</p> Signup and view all the answers

    In which situation does the susceptibility to corrosion increase for 5xxx Series aluminium?

    <p>Excessive cold-working</p> Signup and view all the answers

    Which element is added to aluminium to make harder and stronger alloys?

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

    What properties are associated with 6xxx Series aluminium alloys?

    <p>High strength and good forming</p> Signup and view all the answers

    Which alloy series is used when parts require more strength and little forming?

    <p>7xxx Series</p> Signup and view all the answers

    What is the main purpose of heat treatment for metals?

    <p>To make the metal harder, stronger, and more impact-resistant</p> Signup and view all the answers

    What is the significance of clad surface in aluminium alloys?

    <p>Greatly increases the corrosion resistance of the aluminium alloy</p> Signup and view all the answers

    What is a potential consequence of abrasions on sheet metal according to the text?

    <p>They provide a starting point for stress points</p> Signup and view all the answers

    How do different heat-treating operations affect the properties of metals?

    <p>Properties such as hardness and strength are improved at the expense of impact resistance</p> Signup and view all the answers

    What could happen if a clad surface on an aluminium alloy is penetrated?

    <p>Corrosive agents can attack the alloy beneath</p> Signup and view all the answers

    Why can a metal become brittle during the hardening process?

    <p>Some properties are often improved at the expense of others during hardening</p> Signup and view all the answers

    Which letter designates a material that has been solution heat-treated?

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

    What does the 'T4' designation signify in aluminum alloys?

    <p>Solution heat-treated with room temperature stabilization</p> Signup and view all the answers

    How is 'T5' aluminum alloy different from 'T6'?

    <p>Different artificial aging processes</p> Signup and view all the answers

    Why are the number of solution heat treatments limited for clad materials?

    <p>To avoid diffusion of core material into cladding</p> Signup and view all the answers

    What process is used to make rivets soft enough to drive after being extremely hard?

    <p>Solution heat treatment</p> Signup and view all the answers

    In the material designation 'T36', what does the '36' signify?

    <p>5% thickness reduction by cold-rolling</p> Signup and view all the answers

    What does a letter designation separated from the alloy designation by a dash indicate in metals?

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

    How is the high susceptibility to corrosion issue overcome in magnesium alloys?

    <p>By forming an oxide film on the surface with chemicals</p> Signup and view all the answers

    What does an 'O' designation represent in metal hardness temper?

    <p>An annealed state</p> Signup and view all the answers

    Why are magnesium alloys heated when forming parts?

    <p>To prevent cracking as they have a tendency to crack when formed</p> Signup and view all the answers

    What does an H38 material represent?

    <p>Material that is fully hard after strain-hardening and stabilization</p> Signup and view all the answers

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

    <p>Available in sheets, bars, tubing, and extrusions</p> Signup and view all the answers

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