COST 507 - Repositório Aberto da Universidade do Porto

[96Jac/Spe]. Futhermore thermal conductivity and specific heat capacity measurements
were carried out on quaternary Al-Ti-Cu-Ni alloys.
2 Storage of the thermophysical data in the data base THERSYST
Collection and evaluation of the publications dealing with thermophysical properties of light
metal alloys, started in the 1st round of the COST507 project, have been continued. New
data published in the literature were found by recherche in the literature data banks
METADEX and INIS. Also data measured by partners of the Group D (GR2 -University of
Tessaly, F1 - CNRS Marseille) were entered into THERSYST. The actual status of the data
base: 1489 data-sets on 158 different alloys and metal matrix composites. 590 data-sets of
this collection are referring to the properties describing the heat transport phenomena of 73
industrial alloys, i.e. their thermal conductivity, thermal diffusivity and electrical conductivity.
Heat transport in alloys belongs to the most complex process and it is very difficult to predict
thermal conductivity especially for highly alloyed materials. Analysis of experimental data of
commercial wrought aluminium alloys made by Olafsson [960la] allowed him to present a
model for calculating electrical resistivity at room temperature. This model based on
Mathiessen's rule and on thermodynamical calculations gives good agreement with
experimental data for AlCu- and AIMgSi-alloys, except for AlCu-alloys with higher Cucontent
and no magnesium, and for AIMgSi-alloys with chromium. For highly alloyed
materials especially cast alloys large discrepancies are expected. Therefore it is very
important to collect reliable experimental data.
3 Experimental investigations
3.1 Materials
Aluminium-silicon-based alloys were supplied as casts by Kolbenschmidt AG. Their
chemical compositions are given in Tab.1. All alloys were solution heat treated at 500°C,
water-quenched and aged at different conditions to achieve defined metallurgical states.
Tab.1 Chemical composition (wt%) of Al-Si-based industrial alloys
Alloy
Si
Cu
Mg
Ni
Mn
Fe
others (Ti,Zn,Pb,Sn)
KS1275.1
10.76
1.00
0.97
0.91
0.18
0.42
0.07,0.07,0.02,0.02
KS270
9.49
2.64
0.86
0.01
0.03
0.19
0.05,0.01,0.01,0.01
KS226
8.44
3.09
0.49
0.05
0.39
0.60
0.09,0.46,0.08,0.02
KS1295
13.46
3.71
0.87
2.18
0.45
0.55
0.05,0.08,0.01,0.01
KS1275
13.04
1.01
0.89
0.79
0.11
0.60
0.06,0.12,0.03,0.03
KS281.1
18.56
0.99
0.98
0.79
0.10
0.59
0.06,0.10,0.02,0.02
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