Question

The atomic packing factor of iron increases by what fraction when it is heated from 900 to 1000 C (iron is bcc at lower and fcc at gher temperature)?

Answer 1

The atomic packing factor of iron decreases by what % when it is cooled from 1000 to 900 o C (iron is bcc at lower and fcc at higher temperature) Calculate the number of Co ions released (as m×10n ) in a year from the head (14 mm dia) of a hip joint prosthesis made of an alloy containing 45% Co). The wear rate of the head is 0.11 mm/yr and all the atoms become ionised. Density of Co = 8.83 gm/cc, Atomic weight of Co = 58.93