Materials for engineering, 3rd Edition - (Malestrom)

100
Materials for engineering
At% Al
1100
10 20 30 40 50 60 70 80 90 100
1083.4
1048
1037
1000
χ
958
β γ 1
900
ε 2
Liquid
848
Temperature (°C)
800
700
600
500
400
300
α
780
565
363
α 2
α
γ 2
δ
686
ε 2 624
200
0 10 20 30 40 50 60 70 80 90 100
Wt% Al
3.18 The Cu–Al phase diagram.
Table 3.6 Typical mechanical properties of some copper alloys
Alloy Condition Density Young’s Proof UTS Elongation
(Mg m –3 ) modulus stress (MPa) (% in 50 mm)
(GPa) (MPa)
Cu–1.85Be– Peak aged 8.25 159 1066 1205 7
0.25Co
Cu–30Zn Annealed 8.55 100.6 115 324 67
α-brass
Cu–40Zn Hot rolled 8.40 102 130 371 40
α/β –brass
Cu–31Ni– Hot rolled 8.94 152 114 369 50
1Fe–1Mn
Cu–10Sn–2Zn Sand cast ~8.8 ~111 139 286 18
Cu–8Al Hot rolled 7.8 123 170 417 45
based alloys are also used for the production of gravity castings and pressure
die-castings of high dimensional tolerance.
The casting alloys are based on the Zn–Al system (Fig. 3.19) and are
close to the eutectic composition of 5% Al. The hypoeutectic alloys solidify
591
η 1
θ
57.0
η 2
ζ 2
ζ 2
γ 2
548
94.3
K
660.4