- freely available
Metals 2019, 9(8), 865; https://doi.org/10.3390/met9080865
2. Aim and Scope of the Paper
- Investigation of the technological and material concepts needed to produce the casted alloy composite modified with powders FeAl, Al–FexAly, and Al–FexAly–SiC,
- Determination of the method by which to produce the powders for modification of the aluminum matrix,
- Preparation of the technological process for producing composites with varied contents of structural ingredients,
- Determination of chemical and phase compositions and the structure of the alloy AlSi10Mg0.5Mn0.5.
3. Material and Methodology of Tests
4. Results of Tests and Their Analysis
- Application of the assumed technological procedure of manufacturing the designed dispersion structure of the composite showed a significant decrease of crystallization temperature of the dendrites of the solution (Tliq). The decrease of temperature was of about 18 °C.
- Introduction of the aluminum powders FexAly and FexAly–SiC achieved by ASHS process did not cause a change of crystallization temperature of the eutectic composite, which included a phase rich in Mn and the binary eutectic α(Al) + β(Si).
- As a result of the introduction of FexAly and FexAly–SiC powders, a decrease in the crystallization temperature of the complex eutectic composites was observed, which probably included the intermetallic phase Mg2Si (a decrease of about 10 °C). There was also a temperature Tsol. decrease observed (of about 12 °C), and therefore there was an extension of the crystallization process after the addition of FeAl powder.
- The suggested technological procedure of composite preparation on the basis of sub-eutectic silumin AlSi10Mg0.5Mn0.5 showed refinement of the dendrites of solution α(Al), and transition of plate eutectics α(Al) + β(Si) into modified eutectics. This was confirmed by microstructures.
- Due to insufficiently small exothermic effects from the iron content (around 0.5% mass) and introduced powders FexAly and FexAly–SiC, the ATD thermal tests should be completed with calorimetric analysis DSC.
- For a more complete vision of the influence of modification with FexAly and FexAly–SiC powders, there should be tests of mechanical properties conducted.
Conflicts of Interest
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|alloy EN AC-43400||9.82||0.08||0.47||0.48||0.47||0.13||the rest|
|alloy + powder-1||9.88||0.09||0.51||0.44||0.43||0.11||the rest|
|alloy + powder-2||10.03||0.06||0.53||0.49||0.48||0.12||the rest|
|alloy EN AC-43400||648||578||565||568||550|
|alloy + powder-1||652||559||562||566||540|
|alloy + powder-2||650||560||568||570||539|
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