Binary Solid Liquid Phase Diagram Quiz

1
Binary Solid Liquid Phase Diagram Quiz The Al-Ni
binary solid liquid phase diagram shown below was
calculated by Kevin Jaansalu, Metallurgical
Engineering faculty member (Canadian
Metallurgical Quarterly, 44 (2)205 (2005))
L
a L
L b
L
L a
b
a
L B
B a
A L
C b
A B
a C
Al A
Al L

• For any compounds indicated in this diagram give
• 1. their empirical formulas
• their melting temperatures and whether they melt
  congruently or incongruently.
• A 25.0 Ni, Al3Ni, melts incongruently at 854.1
  ?C
• B 40.0 Ni, Al3Ni2, melts incongruently at
  1134.2 ?C
• C 75.0 Ni, AlNi3, melts incongruently at
  1366.1 ?C

2

• b. Completely label the phases present in any
  one and two phase regions on the diagram using
• 1). L to indicate the melt
• 2). A, B, C, etc. to indicate any compounds with
  A associated with the compound containing the
  least amount of Ni
• 3.) a, b, g, d, etc. to indicate one phase
  regions that are not compounds.
• List the temperatures of all three phase
  equilibria, except the one at 1161.1 ?C
• 1). labeling the equilibria as peritectic or
  eutectic and
• 2). writing reactions for each of these
  peritectic or eutectic equilibria.
• eutectic equilibrium at 611.5 ?C
• Al (s) Al3Ni (s) ltgt eutectic melt of 4 Ni
• peritectic equilibrium at 854.1. ?C
• Al3Ni (s) ltgt peritectic melt of 18 Ni
  Al3Ni2 (s)
• peritectic equilibrium at 1134.2 ?C
• Al3Ni2 (s) ltgt peritectic melt of 27 Ni
  a solid
  solutiion of 43 Ni