6.2 T2 Non-Ferrous Metals and Alloys Quiz

How to identify that aluminum alloys is heat-treatable or non-heat-treatable

• By immersing a sample of the material in a 10% solution of nitric acid

• By immersing a sample of the material in a 10% solution of caustic soda

• By immersing a sample of the material in a 5% solution of caustic soda

Wrought aluminum alloy, -H3 indicates

• Strain hardened and partially annealed

• Strain hardened only

• Strain hardened and stabilized

Hot shortness is a phenomenon of

• annealing of non ferrous material

• annealing of ferrous material

• hardening of ferrous material

How many times can clad alloy be heat treated?

• Once only.

• 3 times.

• as many times as required.

The symbol 'W' on a material indicates.

• it is for use on aircraft mainplanes only.

• it has been solution treated and will respond effectively to precipitation treatment

• it is for workshop use only.

What is the effect of precipitation heat treatment on aluminium?

• It speeds up age hardening process.

• It delays the age hardening process.

• It softens the material to allow it to be worked.

If aluminium alloy is not quenched within the minimum time allowed after heat treatment, is it will be.

• Subject to corrosion.

• Malleable.

• Brittle.

Precipitation treating makes the metal.

• Less strong and hard.

• Harder, stronger and less ductile.

Non heat treatable materials.

• Cannot be hardened.

• Can be hardened by strain hardening or cold working.

• Can be hardened by annealing.

Sheet metal should be stored.

• Above 25 degrees centigrade.

• On its edge in racks to prevent scratching.

• Stacked flat to prevent bending of sheets.