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3 Archives of Foundry Engineering

3 2008

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Structure and mechanical properties of Al-12%Si alloy with fast cooling Al-12%Si

Lipiński T.

Archives of Foundry Engineering

2008

Vol. 8, iss. 3s

51--54

A homogenous modifier obtained by the rapid solidification at a cooling rate equal to v=300 K/s was applied to the modification of the Al-12%Si alloy. The different modifiers were obtained by means of the Al-Si alloys. The components Al-12%Si were put into crucible containing the liquid Al-12%Si alloy and kept for one minute to obtain a new homogenous alloy which after break-up was homogenous modifier. Both, effect of cooling rate applied to obtain modifier and weight in weight modifier concentration in the melt on structure, tensile strength, elongations and hardness of Al-12%Si alloy are determined. A structural, physical and mechanical properties resulting from the Al-12%Si alloy treatment by modifiers are studied in details.

Influence of modifier on base Al and Si on structure and elongation Al-7%Si alloy

Lipiński T.

Archives of Foundry Engineering

2008

Vol. 8, iss. 3s

55--58

A homogenous modifier with Al and Si obtained by the rapid solidification at a cooling rate equal to v=200 K/s was applied to the modification of the Al-7%Si alloy. The different modifiers were obtained by means of the Al-Si alloys. The components Al, Al-7%Si and Al-12%Si were put into crucible containing the liquid Al-7%Si alloy and kept for one minute to obtain a new homogenous alloy which after break-up was homogenous modifier. Both, effect of cooling rate applied to obtain modifier and weight in weight modifier concentration in the melt on structure and elongations of Al-7%Si alloy are determined. A structural, and elongations resulting from the Al-7%Si alloy treatment by modifiers are studied in details.

Heat treatment of squeezed AlZnMg alloy

Zyska A., Konopka Z., Łągiewka M., Nadolski M.

Archives of Foundry Engineering

2008

Vol. 8, iss. 3s

123--126

The examination results concerning strength properties of squeezed and heat treated castings produced of AlZn5Mg alloy have been presented. Experiments have been held for slab castings squeezed under the pressure ranging from atmospheric one to 90 MPa, subsequently heat treated according to the two options: ageing in the temperature of 170°C for 16 h or ageing in the temperature of 120°C for 24 h. The performed examinations have allowed for proving that the better hardening is achieved when the second ageing option is applied, and the optimum properties (Rm exceeding 360 MPa, A5 ≈ 10%) are obtained by heat treatment of the castings squeezed at 30 MPa pressure. Squeezing process changes the α phase solidification morphology and the degree of its refining. A change of structure from the grain one to the cellular-dendritic one occurs. Grain structure comes to existence again after supersaturation and ageing treatment of squeezed castings, but the grain density is significantly greater than for gravity castings.