Influence of Microstructural Inhomogeneity on Fracture Behaviour in SSM-HPDC Al-Si-Cu-Fe Component with Low Si Content
2015 (English)In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 217-218, 67-74 p.Article in journal (Refereed) Published
In the current paper, a low-Si aluminium alloy (1.4-2.4% Si) was used to fabricate acomplex shape telecom component using Semi-Solid High-Pressure Die Cast (SSM-HPDC),process. Microstructure and fracture characteristics were investigated. The cast material exhibitedmicrostructural inhomogeneity, in particular macrosegregation in the form of liquid surfacesegregation bands in addition to sub-surface pore bands and gross centre porosity. Tensilespecimens were taken from the cast components. Elongation and microstructural inhomogeneitywere investigated and correlated. Fracture surfaces of the tensile specimen were examined underscanning electron microscope (SEM). The study showed that both near surface liquid segregationbands and subsurface porosity strongly affected the fracture behaviour. Dominant for loss ofductility was gross centre porosity. The centre porosity was found to be a combination of trappedgas and insufficient, irregular feeding patterns.
Place, publisher, year, edition, pages
Switzerland: Trans Tech Publications Inc., 2015. Vol. 217-218, 67-74 p.
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:hj:diva-24393DOI: 10.4028/www.scientific.net/SSP.217-218.67ScopusID: 2-s2.0-84914151681OAI: oai:DiVA.org:hj-24393DiVA: diva2:739774