54. Fill in the missing words in the following statements with the best word fro

Question

54. Fill in the missing words in the following statements with the best word from the list of words given at the end of the text. a) The principal advantage of is its very low density which gives its alloys a very good strength to weight ratio. Nickel and its alloys are commonly used at high b) and also in environments, such as being in contact with human skin. c) Although and its alloys do not show fatigue limits, their good strength and stiffness to weight ratios have resulted in them being used extensively in aerospace applications d) From a mechanical property viewpoint, steels not only have excellent , they by varying heat treatments. can also be produced with a wide range of Aluminum alloys can be either depending on the alloy system. for wrought alloys. e) or may also be used as a strengthening method f) One of the best alloys for damping vibrations is . This is due to the microstructure which contains ferrite and/or pearlite and g) is used in large quantities for steel to reduce and its alloys are also used for high pressure die castings for small machine components. h) and its alloys have a very good combination of mechanical properties but they Their main disadvantage is their also show excellent resistance to many reactivity with air when molten which increases their processing costs. is the hardest of the cast irons and is used primarily for its excellent wear resistance and alloy steels such as 4340 (steel with chromium, nickel, molybdenum additions), can be used for very demanding applications such as aircraft undercarriages because of their combination of high and high k) and its alloys are useful in electrical systems because of their high and However they are also used in fixtures because of their good resistance to corrosion in water grey-cast-iron, copper, magnesium, white-cast-iron, titanium, aluminium, zinc, chemicals, corrosive, temperatures, plumbing, thermal-conductivity, stiffness, rusting, heat-treatable, graphite-flakes, strengths, quenched, strength, galvanising, toughness, non-heat-treatable, electrical-conductivity, cold-working, tempered

Explanation / Answer

a) titanium

b) temperatures, chemicals

c) aluminium

d) stiffness, strengths

e) heat-treatable, non-heat-treatable, cold working

f) grey-cast-iron, graphite-flakes

g) aluminium, tempered, corrosive

h) zinc

i) white-cast-iron

j) magnesium, titanium, strenght and toughness

k) copper, electrical-conductivity, thermal-conductivity, plumbing

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