Shear band formation in shaped rheocast aluminium component atvarious plunger velocities

• Abstract: Significant progress has been made in recent years in understanding and modelling the rheology of semi-solid metals.These models show the effects of the microstructure in terms of size and morphology of globules on the material response. Morerecently it has been shown that semi-solid metals can behave as compacted granular materials such as sand. A particular signature ofsuch deformation is that the deformation becomes concentrated into shear bands which are 10−20 grains wide. Such bands have alsobeen observed in a range of cast products. Recently, it has been clearly shown that shear bands in high pressure die cast (HPDC)products are also the results of Reynolds dilatancy. Shear bands are also known to be a common feature in semi-solid metal products.The segregation banding in semi-solid metal (SSM) material and its dependence of plunger velocity were investigated. Shapedcastings were made with the RHEOMETAL™ process with a range of different plunger velocities. The microstructuralcharacteristics were investigated, with a particular emphasis on shear bands. It is shown that ingate velocities influence the locationand characteristics of the shear bands.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

rheocasting

shear bands

segregation

Al-alloys

RHEOMETAL™

TECHNOLOGY

Publikations- och innehållstyp

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