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COST 507 - Repositório Aberto da Universidade do Porto

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Table 1 Invariant points in Al-Mn-Si<br />

Phase assemblage<br />

T C Liquid compositions wt %<br />

Reference<br />

w(Mn)<br />

w(Si)<br />

liq + beta AlMnSi<br />

+ ALMn + Al 4 Mn<br />

703.9<br />

690<br />

690<br />

690<br />

4.32<br />

3.8<br />

4.5<br />

4.5<br />

0.29<br />

0.7<br />

0.5<br />

0.5<br />

Calculated<br />

[76Mon]<br />

[61 Phi]<br />

[93Pri]<br />

liq + beta AlMnSi<br />

+ Al 6 Mn + C alpha<br />

644.4<br />

657<br />

655<br />

655<br />

2.50<br />

2.8<br />

2.65<br />

2.6<br />

0.72<br />

1.6<br />

1.6<br />

1.6<br />

Calculated<br />

[76Mon]<br />

[61 Phi]<br />

[93Pri]<br />

liq + fcc + C alpha<br />

+ ALMn<br />

653.9<br />

648<br />

649<br />

649<br />

2.09<br />

2.5<br />

2.0<br />

2.0<br />

0.69<br />

1.5<br />

1.28<br />

1.2<br />

Calculated<br />

[76Mon]<br />

[61 Phi]<br />

[93Pri]<br />

liq + fcc + C alpha<br />

+ diamond<br />

576.4<br />

574<br />

573<br />

0.35<br />

1.0<br />

0.75<br />

12.57<br />

12.0<br />

11.75<br />

Calculated<br />

[76Mon]<br />

[61 Phi]<br />

The calculated isopleths for 4 wt% Si and 4 wt% Mn are given in Figs 1 and 2 and<br />

the calculated liquidus projection is shown in Fig 3. A calculated partial isothermal<br />

section for 600 °C is compared with experimental <strong>da</strong>ta from Thornton [95Tho] in Fig<br />

4 and the calculated fcc solvus is compared with the experimental <strong>da</strong>ta of Kolby et al<br />

[94Kol/Sig] in Fig 5.<br />

It will be seen that the current assessment gives a good representation of those <strong>da</strong>ta in<br />

which we have the highest confidence. A reassessment should be carried out when<br />

additional phase equilibria and thermodynamic information on the cubic-alpha and beta<br />

phases becomes available.<br />

7 Acknowledgements<br />

The authors gratefully acknowledge valuable discussions with Dr Paul V Evans and<br />

Martin C Thornton (Alean International Ltd), Dr Christophe Sigli (Pechiney) Dr<br />

Christian Simensen (SINTEF) Dr J E Tibballs (University of Oslo) and Dr F H Hayes<br />

(University of Manchester/UMIST).<br />

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