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Heats of
Coefficient
Vicker’s Formation Color of Linear Specific at 400K (cal of the Expansion Resistance Hardness +/–500) Phase (10 –5 ) (Ohm–cm) (5 Kg) Gold 1.42 2.3 60–90 Tan 1.2 37.5 334 Tan 1.4 25.5 271 –8300 Tan 1.3 13.1 130 –9200 White 1.2 12.4 249 –10100 Purple 0.94 7.9
Composition at % Au 84–100 80–81.2 72.7 65–66.8 50 32.33 –33.92 0–0.6
Lattice Parameters (Å) a = 4.08 a = 6.92 a = 14.68, α = 30.5 a = 7.71 c = 41.9 A = 3.36 B = 8.84 C = 3.21 A = 6.40 B = 3.33 C = 6.32 β = 92.99 A = 5.99 A = 4.05 Structure and Properties of Au-Al Intermetallic Compounds a
Structure FCC Cubic Rhombohedral HCP Orthorhombic Monoclinic FCC FCC Note: This figure was assembled by N. Noolu, see App. 5B.
Phase Au Au 4 Al Au 8 Al 3 Au 5 Al 2 Au 2 Al AuAl AuAl 2 Al a See Refs [5-102 to 5-104] TABLE 5-1
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