30 Questions
What is the significance of the last two digits in the alloy numbering system?
They differentiate between different alloys within the same group
Which series of alloys is known for its susceptibility to intergranular corrosion when improperly heat treated?
2xxx Series
What is the principle alloying element in the 3xxx Series of aluminium alloys?
Manganese
Why are aluminium-copper alloys in the 2xxx Series known for greater strength?
As a result of certain metallic changes in grain structure
Which two alloys are commonly used in aircraft structures for constructing skins and rivets?
2017 and 2024
What features are associated with alloys in the 1xxx Series of aluminium?
Strain-hardenable, high formability, corrosion resistance, and electrical conductivity
What is the purpose of solution heat treatment on aluminium alloys?
To mix the alloying element with the base metal
Why is it crucial to remove an alloy from the furnace to quench within a specified time?
To prevent large alloy grains from weakening the alloy
What happens if excessive precipitation occurs during the cooling process?
Large grains of alloy weaken the base metal
How is the cooling rate controlled in the solution heat treatment process?
By selecting an appropriate quenching medium
What is the main consequence of not stopping the precipitation process during cooling?
Formation of large grains that weaken the alloy
Why is it important to maintain a small tolerance regarding the soaking temperature during solution heat treatment?
To ensure uniform distribution of alloying elements
What does the digit following the temper designations H1, H2, and H3 indicate?
Degree of strain-hardening
What does the letter O represent in a material's temper designation?
Annealed state
What drawback of using magnesium in aircraft structures is overcome by treating the surface with chemicals that form an oxide film?
High susceptibility to corrosion
How is the tendency of magnesium to crack when formed typically overcome?
Heating the parts when forming
What physical property makes magnesium alloys suitable for use in aircraft structures?
Low density
In what form are magnesium alloys available for use in aircraft structures?
Sheets, bars, tubing, and extrusions
What should be done to extinguish a fire caused by magnesium?
Extinguish it with dry sand
What does solution heat treatment do to magnesium alloys?
Increases tensile strength, ductility, and resistance to shock
Why is titanium dioxide conversion needed before using titanium?
To enhance corrosion resistance
What characteristic of titanium makes it extensively used in the civilian aerospace industry?
Excellent resistance to salt water corrosion
How does artificially aging magnesium alloys after solution heat treatment affect them?
Increases hardness and yield strength
What is the recommended method for extinguishing a fire involving magnesium alloys?
Using dry sand or a dry material that excludes air
What is the primary metal used for electrical wiring?
Copper
Which alloy is commonly used in electrical components for its high conductivity?
Brass
Why is beryllium copper identified as a hazardous material in Safety Data Sheets?
Production of airborne contaminants during grinding
What is the primary difference between Inconel and stainless steel?
Appearance
Which metal is found filling narrow cracks or fissures?
Copper
In aircraft construction, which metal has little use as a structural material?
Copper
Test your knowledge on identifying alloys within the 1xxx series of aluminium based on consecutive numbering and distinctive features. This quiz is based on the Aviation Australia Percentage of Alloying Element Table for B-06a Materials and Hardware, as per CASA Part 66 training materials.
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