TY - CHAP

T1 - Effect of LPSO Phases on Crack Propagation in an Extruded Mg–Dy–Nd–Zn–Zr Alloy Influenced by Heat Treatment

AU - Maier, Petra

AU - Clausius, Benjamin

AU - Richter, Asta

AU - Bittner, Benjamin

AU - Hort, Norbert

AU - Menze, Roman

N1 - Conference code: 12

PY - 2021

Y1 - 2021

N2 - The effect of LPSO phases on the crack propagation in different microstructures modified by heat treatment is investigated. Solution heat treatment on a hot-extruded Mg–Dy–Nd–Zn–Zr alloy (RESOLOY) is done to change the initial fine-grained microstructure, consisting of lamellar LPSO structures within the matrix, into coarser grains of less lamellae but blocky LPSO phases. C-Ring compression tests were done with the focus on crack initiation and propagation. The blocky LPSO phases clearly hinder crack growth, either by increasing the energy to pass through the phases or along its interface. LPSO phases are found to be responsible for crack initiation: by the interface or the softer Mg-matrix in between LPSO lamellae. The softer Mg-matrix layer is providing the possibility for slip band cracking. In the coarser-grained microstructure, the crack propagation is also influenced by twins. 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. Blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases— more specific by nanoindentation.

AB - The effect of LPSO phases on the crack propagation in different microstructures modified by heat treatment is investigated. Solution heat treatment on a hot-extruded Mg–Dy–Nd–Zn–Zr alloy (RESOLOY) is done to change the initial fine-grained microstructure, consisting of lamellar LPSO structures within the matrix, into coarser grains of less lamellae but blocky LPSO phases. C-Ring compression tests were done with the focus on crack initiation and propagation. The blocky LPSO phases clearly hinder crack growth, either by increasing the energy to pass through the phases or along its interface. LPSO phases are found to be responsible for crack initiation: by the interface or the softer Mg-matrix in between LPSO lamellae. The softer Mg-matrix layer is providing the possibility for slip band cracking. In the coarser-grained microstructure, the crack propagation is also influenced by twins. 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. Blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases— more specific by nanoindentation.

KW - Crack propagation

KW - LPSO phases

KW - Magnesium

KW - Microstructure

KW - Nanoindentation

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85111400568&partnerID=8YFLogxK

U2 - 10.1007/978-3-030-72432-0_6

DO - 10.1007/978-3-030-72432-0_6

M3 - Article in conference proceedings

AN - SCOPUS:85111400568

SN - 978-3-030-72431-3

SN - 978-3-030-72434-4

T3 - Minerals, Metals and Materials Series

SP - 45

EP - 55

BT - Magnesium 2021 - Proceedings of the 12th International Conference on Magnesium Alloys and their Applications

A2 - Luo, Alan

A2 - Pekguleryuz, Mihriban

A2 - Agnew, Sean

A2 - Allison, John

A2 - Kainer, Karl

A2 - Nyberg, Eric

A2 - Poole, Warren

A2 - Sadayappan, Kumar

A2 - Williams, Bruce

A2 - Yue, Steve

PB - Springer Science and Business Media Deutschland GmbH

T2 - 12th International Conference on Magnesium Alloys and their Applications - Mg 2021

Y2 - 15 June 2021 through 18 June 2021

ER -