Conference, Proceedings

Alloy
Components Weight Percent, [%]
Ni Co Cu Mn Mg Cr Al Si Mo Ca Zn
FeNi29 29.21 0.005 0.005 ‐ ‐ 0.005 0.005 ‐ ‐ ‐ ‐
FeNi35 35.45 0.05 0.1 0.005 0.001 0.01 0.005 0.005 0.001 0.005 0.005
FeNi39 39.12 0.05 0.1 0.005 0.001 0.01 0.005 0.005 0.001 0.005 0.005
FeNi48 48.34 ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐
FeNi60 60.0 ‐ 0.001 0.005 ‐ 0.05 0.001 ‐ 0.005 ‐ ‐
Remark : Results of the thermal diffusivity and Curie Points investigations of FeNi29, FeNi35 and
FeNi39 invar alloys were described in [7] and are presented in this paper as comparable results.
A typical record of the final handling of experimental data Δ Θ′ (t)
during the thermal
diffusivity evaluation, according to procedure described above, for FeNi48 and FeNi60 alloys
are shown in Figure. 6 and 7. Results of the thermal diffusivity investigations for the measured
alloys are shown in Figure 8.
10
8
6
4
2
0
Δθ
[Κ]
laser
shot
a(583K) = 5.95*10 -6 m 2 /s
experimental
run ofΔθ' (t)
lnΔθ '(t i )
theoretical
curveΔθ (t)
0 10 20 30 40 50 60
t 1
y = lnΔθ '(t)= ln4θ - t/τ
∞
FeNi48
l = 1.60 mm
T = 583 K
t 1 = 30 ms
t 2 = 70 ms
τ = 43.59 ms
θ = 2,25 K
∞
t 2
70 80
Figure 6: Final handling of experimental data ΔΘ ’(t) during thermal diffusivity evaluation
for FeNi48 alloy at T = 583 K
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