Aircraft Materials - Non-Ferrous Flashcards
What is the effect of precipitation heat treatment on aluminium?
It speeds up age hardening process
Aluminium exposed to air will
Oxidise and become electrically insulated
What care should you take with 2024-T3?
Do not scratch or make nicks in it
If aluminium alloy is not quenched within minimum time allowed after heat treatment is it will be
Brittle
Anodising protects alloy metal from corrosion and does what else?
Makes a good surface for paint to adhere to
Pure aluminium is
Highly resistant to corrosion
Precipitation treating makes the metal
Harder, stronger and less ductile
A material has the code 2024-T6 on it. Which part of the code indicates the percentage of he alloying element?
24
Aluminium alloyed primarily with magnesium is numbered
50xx
Non heat treatable materials
Can be hardened by strain hardening or cold workings
Cold working of a material is used to reduce
Wear of manufacturing tools
The main metal in Monel is
Nickel
Why is nickel chromium used in many exhaust systems?
Corrosion resistant and low expansion Coefficient
Titanium alloys
Have a high strength to weight ratio
Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?
20
Clad aluminium alloys are used in aircraft because they
Are less subject to corrosion than uncharted aluminium alloys
Non heat treatable aluminium alloys
Can be hardened by strain hardening
When buffing surface of Aluminium Alloy, what material are you removing?
Oxide layer
Why is clad alloy preferred to pure Aluminium?
Tougher
Why are aluminium alloys used on aircraft, instead of pure aluminium?
Stronger
Age hardening of aluminium is
Never carried out
Alcad is
Duralumin with aluminium coating
The oxide film on the surface of aluminium is
Non porous
The process of rolling a layer of pure aluminium over an aluminium alloy is
Cladding
The critical aspects of heat treatment are
Temperature, method of heating and cooling
What is generally true for titanium alloy?
It is stronger than aluminium
Malleable materials are
Easy to forge
If material has to undergo deep cold forming operation, the essential property would be
Malleability
When two or more metallic materials are fused together, the combination is known as
An alloy
Malleable materials are normally
Easily forged
How does large grain size effect the mechanical properties of metal?
Materials with large grain size are more prone to creep
The cracking of structural members under repeated stress lower than the ultimate tensile load is known as
Fatigue failure
A sheet of metal is designated 2024-T4, the code tells us that the material is a copper based aluminium alloy which has been
Solution treated and naturally aged
Money metal consists of approximately
66% nickel and 33% copper
The ease with which a material can be forged, rolled and extruded without fracture is an indication of a material’s
Malleability
What is fatigue?
Cyclic stressing of a part
Annealing of aluminium
Removes stresses caused by forming
In the Brinell hardness test, you would measure the indentation’s
Diameter
The impact testing technique is used on a material to test for
Toughness
What is a fusible material?
The ability of a metal to melt
Brittleness is
The property of inability to deform before cracking
Hooke’s law states that, within the elastic region, elastic strain is
Directly proportional to stress
The given of stress for a given material can be derived by
Load / Cross sectional area
A material’s yield strength is the ability to
Resist deformation
What type of a test involves stretching material until it breaks?
Tensile testing
How many times can clad alloy be heat treated?
3 times
