Yielding and failure of hot chamber die cast thin-walled AZ91D

• Thin-walled components in AZ91D magnesium are commonly cast using hot chamber die casting. AZ91D mechanical properties commonly show scatter and its low critically resolved shear stress cause early yield with an ill-defined yield point. This may result in large differences between the true yield point or proportionality limit and the off-set proof stress. The current study takes a look at this and its relation to the failure of the component. The material investigated was a hot chamber die cast material with a wall thickness of 0.8mm. Tensile tests were made and the proportionality limit and off-set proof stress was established as well as elongation to failure and tensile strength. The overall average off-set proof stress was 154 MPa and the overall proportionality limit was 63 MPa resulting in a typical property Stress Gap of 91MPa. This difference varied from 65MPa up to 105MPa. The Apparent Toughness was also evaluated The Stress Gap and Apparent Toughness was analysed and the influence of process parameters established.

Ämnesord

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

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

Nyckelord

AZ91D

Elongation

Hot chamber die casting

Magnesium

Process parameters

Toughness

Yelding

Die casting

Dies

Magnesium castings

Shear stress

Stresses

Tensile strength

Tensile testing

Thin walled structures

Critically resolved shear stress

Elongation to failure

Hot chamber die castings

Influence of process parameters

Thin walled components

Yield stress

Publikations- och innehållstyp

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