metals and alloys e lec

Question 1

what is amalgam

Answer 1

an alloy-containing mercury

Question 2

what is amalgam composed of

Answer 2

liquid mercury- very distilled and pure

and a powder which is a metal alloy

Question 3

what is a metal

Answer 3

having a metallic lustre, when freshly cut, and able to conduct electricity and heat

Question 4

how do metals bond

Answer 4

via metallic bonding

with a delocalised sea of electrons in between the layers

Question 5

what happens when liquid metal cools

Answer 5

crystals will form; these crystals form at many sites in the liquid and grow. Obviously once the liquid melt has all solidified, the crystals with their lattices arranged randomly in different orientations occlude

Question 6

what is the grain boundary

Answer 6

it is the small volume of grains which is disorganised

Question 7

what is a mixture of two metals called

Answer 7

binary alloys

Question 8

what properties of an alloy can be altered

Answer 8

required need, expense, strength, modulus, corrosion resistance

Question 9

what does an alloy have

Answer 9

a melting range

Question 10

what is the solidus

Answer 10

or the line that bounds the all solid region

Question 11

what is the liquidus

Answer 11

“liquidus” for the upper line