diagram fasa 1.doc
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DIAGRAM FASA 1.docTRANSCRIPT
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DIAGRAM FASA
Air Murni (H2O)
L
V
S
760
Freezing vaporization
T H2O oC1000
P H2Otorr
Triple point 0,01
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Fe Murni
Aturan fase : P + F = C + 2 ( 2 parameter)
P + F = C + 1 (1 parameter)
FASE UNSUR A-B
1538
1394
910
Triple point
P (atm)
T (oC)
2000
1500
1000
500
δ Fe (bcc
γ Fe (fcc)
α Fe(bcc
10-12 104
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Xl + Xs = 1
Fr. Campuran Wo = Xl Wl + Xs Ws
Fr wt (cair) Xl = (Ws – Wo)/(Ws- Wl)
Fr wt (padat) Xs = (Wo –Wl)/(Ws – Wl)
Soal
L L+S
S
T
Liquidus
Solidus
T o C
A 0 1 B Wl W0 Ws
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Fig. 8.3 : Alloy Cu-Ni, kandungan Cu 47 wt %, Ni 53 Wt % pada T 1300 oC
a. Berapa % wt Cu pada fase cair dan padatb. Berapa % wt alloy cair dan padatc. Berapa % wt Ni pada fase cair dan padat
Solusia. Pada T 1300 oC perpotongan dgn garis liquidus Cu 55 % cair dan perpotongan dengan garis solidus Cu 42 % padat.
b. Pada T 1300 oC W0 = 53 % Ni, Wl = 45% Ni, Ws = 58 % Ni Fr. wt fase cair (Xl) = (Ws – W0)/(Ws - Wl)
= (58 – 53)/(58 – 45) = 38 % Fr wt fase padat (Xs) = (W0 – Wl)/(Ws – Wl)
= (53 – 45)/(58 – 45) = 62 %
c. Pada T 1300 oC perpotongan dengan garis liquidus & solidus diperoleh Ni 45 % cair & Ni 58 % padat.
Fasa System Alloy Eutectic
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Alloy 2 Alloy 1
ββ + Lα + L
L
α
TC
Te
A B
1 2 3
4 5
α + β
X4 X1 Xc X5 X2 X3
Pada suhu Te : L α + β (eutectic)
Alloy 1(Te) : % wt α = (X3 – X2)/(X3 – X1) x 100 %
% wt β = (X2 – X1)/(X3 – X1) x 100 %
Alloy 2 (TC) : % wt L = (XC – X4)/(X5 – X4) x 100 %
% wt α = (X5 – XC)/(X5 – X4) x 100 %
C