TY - CHAP

T1 - Effects of Mn and Zn solutes on grain refinement of commercial pure magnesium

AU - Gu, Jian

AU - Huang, Yuanding

AU - Zhang, Mingxing

AU - Kainer, Karl Ulrich

AU - Hort, Norbert

PY - 2017

Y1 - 2017

N2 - The effects of Mn (peritectic system) and Zn (eutectic system) on the grain refinement of commercial pure Mg were investigated. Interdependence model and solute paradigm theory were applied to evaluate the grain nucleation and growth for these two alloy systems. Both Mn and Zn can refine the grain of pure Mg. Compared to Mg–Zn, the nucleant particles in Mg–Mn alloys are more potent, but the relatively activated number of nucleation sites is much fewer. Zn with relatively high value of growth restriction factor increases the initial rate of development of the constitutional supercooling (CS) zone at the earliest stage of grain growth, which plays a key role in determining the final grain size. Moreover, heavy segregation of Zn during solidification provides a driving-force to activate further nucleation in the CS zone, which may trigger some unknown native nucleation particles to sever as nuclei.

AB - The effects of Mn (peritectic system) and Zn (eutectic system) on the grain refinement of commercial pure Mg were investigated. Interdependence model and solute paradigm theory were applied to evaluate the grain nucleation and growth for these two alloy systems. Both Mn and Zn can refine the grain of pure Mg. Compared to Mg–Zn, the nucleant particles in Mg–Mn alloys are more potent, but the relatively activated number of nucleation sites is much fewer. Zn with relatively high value of growth restriction factor increases the initial rate of development of the constitutional supercooling (CS) zone at the earliest stage of grain growth, which plays a key role in determining the final grain size. Moreover, heavy segregation of Zn during solidification provides a driving-force to activate further nucleation in the CS zone, which may trigger some unknown native nucleation particles to sever as nuclei.

KW - Constitutional supercooling

KW - Grain refinement

KW - Magnesium alloys

KW - Solute elements

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85042276950&partnerID=8YFLogxK

U2 - 10.1007/978-3-319-52392-7_29

DO - 10.1007/978-3-319-52392-7_29

M3 - Article in conference proceedings

AN - SCOPUS:85042276950

SN - 978-3-319-52391-0

T3 - Minerals, Metals and Materials Series

SP - 191

EP - 198

BT - Magnesium Technology 2017

A2 - Neelameggham, Neale R.

A2 - Singh, Alok

A2 - Solanki, Kiran N.

A2 - Orlov, Dmytro

PB - Springer International Publishing AG

T2 - International Symposium on Magnesium Technology 2017

Y2 - 26 February 2017 through 2 March 2017

ER -