6.2 Non ferrous materials Flashcards
what are common non ferrous metals
copper, aluminium, titanium, magnesium
what ore does aluminium come from
bauxite
how are aluminium alloys classified q
mahor alloying element
what are the most common elements for aluminum alloys
copper, magnesium, manganese, zinc
what are the 2 main classes of aluminum alloys
wrought, cast
what is the 4 digit index of aluminium alloy broken down into
1st digit: main alloying ingredient,
2nd digit: modification of alloy
3/4: alloy designator (no special significance)
why are certain aluminium alloys susceptible to corrosion
due to its alloying elements (copper, zinc)
how is aluminium alloys protected
cladding of pure aluminum (3-5% of material thickness)
what is the most popular magnesium alloy
AZ31
is magnesium more or less dense than aluminium?
less dense, weighs 2/3 as much
properties of pure magnesium
high susceptibility to corrosion
easily cracked when formed
burns easily in powder or small particle form
where are magnesium alloys used on aircraft
wheels, engine crankcases, valve bodies
how much lighter is pure titanium compared to aluminium
50%
yet equally as strong as iron
properties of pure titanium
soft and ductile
density between aluminium and iron
what is titanium used for
bolts, fasteners, flap tracks, engine compressor blades, firewalls, hydraulic pipes
what are the 2 most common used nickel alloys
monel, inconel
how much nickel and copper is in monel
68% nickel, 29% copper
where is monel used for
gears, parts that require high strength and toughness, exhuast
how much nickel does inconel contain
80% nickel, 14% chromium
what is inconel commonly used for
turbine engines
what are the 2 types of heat treatments
solution heat
precipitation
what is solution heat treatment
process of heating aluminium alloys to allow the alloying element to mix with the base metal
for large forging what water is used for quenching
hot water, alleviate distortion and cracking
what is natural ageing
alloy cooling at room temp
what does T mean for heat treated alloys
Solution heat treatment
what does T3 mean for heat treated alloys
solution heat treated, followed by strain hardening
what does T4 mean for heat treated alloys
solution heat treatment, followed by natural ageing
what does T6 mean for heat treated alloys
solution heat treatment, followed by artificial ageing
what is the benefit of reheat treatment
relieve stresses, improve mechanical properties, facilitate cold working
what is strain hardening also known as
cold working or work hardening
