Crack propagation in as-extruded and heat-treated mg-dy-nd-zn-zr alloy explained by the effect of lpso structures and their micro-and nanohardness
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Crack propagation in as-extruded and heat-treated mg-dy-nd-zn-zr alloy explained by the effect of lpso structures and their micro-and nanohardness. / Maier, Petra; Clausius, Benjamin; Richter, Asta et al.
In: Materials, Vol. 14, No. 13, 3686, 01.07.2021.Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Crack propagation in as-extruded and heat-treated mg-dy-nd-zn-zr alloy explained by the effect of lpso structures and their micro-and nanohardness
AU - Maier, Petra
AU - Clausius, Benjamin
AU - Richter, Asta
AU - Bittner, Benjamin
AU - Hort, Norbert
AU - Menze, Roman
PY - 2021/7/1
Y1 - 2021/7/1
N2 - The investigation of the crack propagation in as-extruded and heat-treated Mg-Dy-Nd-Zn-Zr alloy with a focus on the interaction of long-period stacking-ordered (LPSO) structures is the aim of this study. Solution heat treatment on a hot extruded Mg-Dy-Nd-Zn-Zr (RESOLOY®) was done to change the initial fine-grained microstructure, consisting of grain boundary blocky LPSO and lamellar LPSO structures within the matrix, into coarser grains of less lamellar and blocky LPSO phases. C-ring compression tests in Ringer solution were used to cause a fracture. Crack initiation and propagation is influenced by twin boundaries and LPSO lamellae. The blocky LPSO phases also clearly hinder crack growth, by increasing the energy to pass either through the phase or along its interface. The microstructural features were characterized by micro-and nanohardness as well as the amount and location of LPSO phases in dependence on the heat treatment condition. By applying nanoindentation, blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases and their hardness decreases with heat treatment time. On the other hand, the matrix increases in hardness by solid solution strengthening. The microstructure consisting of a good balance of grain size, matrix and blocky LPSO phases and twins shows the highest fracture energy.
AB - The investigation of the crack propagation in as-extruded and heat-treated Mg-Dy-Nd-Zn-Zr alloy with a focus on the interaction of long-period stacking-ordered (LPSO) structures is the aim of this study. Solution heat treatment on a hot extruded Mg-Dy-Nd-Zn-Zr (RESOLOY®) was done to change the initial fine-grained microstructure, consisting of grain boundary blocky LPSO and lamellar LPSO structures within the matrix, into coarser grains of less lamellar and blocky LPSO phases. C-ring compression tests in Ringer solution were used to cause a fracture. Crack initiation and propagation is influenced by twin boundaries and LPSO lamellae. The blocky LPSO phases also clearly hinder crack growth, by increasing the energy to pass either through the phase or along its interface. The microstructural features were characterized by micro-and nanohardness as well as the amount and location of LPSO phases in dependence on the heat treatment condition. By applying nanoindentation, blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases and their hardness decreases with heat treatment time. On the other hand, the matrix increases in hardness by solid solution strengthening. The microstructure consisting of a good balance of grain size, matrix and blocky LPSO phases and twins shows the highest fracture energy.
KW - Crack propagation
KW - Hardness
KW - LPSO phases
KW - Magnesium
KW - Mg-Dy-Nd-Zn-Zr
KW - Nanoindentation
KW - RESOLOY®
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85110036646&partnerID=8YFLogxK
U2 - 10.3390/ma14133686
DO - 10.3390/ma14133686
M3 - Journal articles
C2 - 34279254
AN - SCOPUS:85110036646
VL - 14
JO - Materials
JF - Materials
SN - 1996-1944
IS - 13
M1 - 3686
ER -