Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 709, Issue -, Pages 193-202Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.10.035
Keywords
Characterization; Fracture behaviour; Stress/strain measurements; Aluminium alloys; Intermetallics; Synchrotron tomography
Categories
Funding
- COMET-Program of the Austrian Research Promotion Agency (FFG)
- Provinces of Upper Austria (LOO)
- [843540]
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The microstructural evolution during solution treatment at 500 degrees C of a cast AlSi12Cu4Ni2 piston alloy is evaluated by two dimensional and three dimensional imaging methods aiming at identifying the microstructural features affecting the processes of damage formation and accumulation under tensile deformation. Highly. interconnected networks of aluminides and Si undergo a local loss of connecting branches within these networks owing to the partial dissolution of Cu-rich aluminides and a slight Si spheroidisation. The damage by tensile deformation is studied using synchrotron tomography during in situ tensile tests. In both studied heat treatment conditions (0 h and 4 h solution treated) damage initiates in the form of micro-cracks in clusters of primary Si particles and debonding at the interface between Si and the matrix. These micro-cracks grow through inter metallic phases in the last stages of deformation. Final failure occurs by coalescence of these cracks mainly through the rigid phases. The loss of connectedness of the Si-intermetallics network during solution treatment allows the alloy to accommodate more damage and plastic strain resulting in an increase of ductility with respect to the as cast condition.
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