TY - CHAP

T1 - Crack propagation under bending in cast MglOGdxNd-T4 alloys

AU - Maier, Petra

AU - Mendis, Chamini

AU - Wolff, Martin

AU - Hort, Norbert

N1 - Conference code: 143

PY - 2014

Y1 - 2014

N2 - Mg-alloys containing RE additions are promising candidates for structural applications, as they combine low density with high strength, which is important for lightweight construction. Medical applications, like bone screws and nails, benefit from their moderate corrosion rate. All these components are exposed to bending, more or less influenced by corrosion. In this study the Mg-lOGd-xNd (x=0,l,2 wt.%) were subjected to solution heat treatment to increase ductility and to reduce the dendritic microstructure. Plates of 110×20×6 mm3 in size were tested by three-point bending with a deformation speed of 1 mm/min. Crack growth is discussed using light microscopy and correlated to bending stress - outer strain curves. Crack propagation is mostly found transgranular and interacts with twinning. Double and secondary twinning occurs near the crack path in appropriately oriented grains. Corroded samples after pre-bending show an increase in yield strength but reduced toughness. Cracked samples show a strong reduction in flexural strength after corrosion.

AB - Mg-alloys containing RE additions are promising candidates for structural applications, as they combine low density with high strength, which is important for lightweight construction. Medical applications, like bone screws and nails, benefit from their moderate corrosion rate. All these components are exposed to bending, more or less influenced by corrosion. In this study the Mg-lOGd-xNd (x=0,l,2 wt.%) were subjected to solution heat treatment to increase ductility and to reduce the dendritic microstructure. Plates of 110×20×6 mm3 in size were tested by three-point bending with a deformation speed of 1 mm/min. Crack growth is discussed using light microscopy and correlated to bending stress - outer strain curves. Crack propagation is mostly found transgranular and interacts with twinning. Double and secondary twinning occurs near the crack path in appropriately oriented grains. Corroded samples after pre-bending show an increase in yield strength but reduced toughness. Cracked samples show a strong reduction in flexural strength after corrosion.

KW - Bending

KW - Corrosion

KW - Crack growth

KW - Mg-RE

KW - Twinning

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=84899818283&partnerID=8YFLogxK

M3 - Article in conference proceedings

AN - SCOPUS:84899818283

SN - 9781118888162

T3 - Magnesium Technology

SP - 77

EP - 82

BT - Magnesium Technology 2014 - Held During TMS 2014 143rd Annual Meeting and Exhibition

PB - The Minerals, Metals & Materials Society

T2 - 143rd Annual Meeting and Exhibition of Magnesium Technology 2014 - TMS 2014

Y2 - 16 February 2014 through 20 February 2014

ER -