TY - CHAP

T1 - Influences of Y additions on the hot tearing susceptibility of Mg-1.5wt.%Zn alloys

AU - Wang, Zhi

AU - Huang, Yuan Ding

AU - Srinivasan, Amirthalingam

AU - Liu, Zheng

AU - Kainer, Karl Ulrich

AU - Hort, Norbert

N1 - Conference code: 6

PY - 2013/7/1

Y1 - 2013/7/1

N2 - The influences of Y (0.2, 2 and 4 wt.%) additions on the hot tearing behaviour of Mg-1.5Zn alloys were investigated using a constrained rod casting (CRC) apparatus equipped with a load cell and data acquisition system. The initiation of hot tearing was monitored during CRC experiments. It corresponds to a drop in load on the hot tearing curves. The experimental results indicate that, the hot tearing susceptibility defined by the total crack volume, which was measured by the wax penetration method, decreases with increasing the content of Y at a mould temperature of 250 °C. The reduced susceptibility is attributed to the effect of Y on the solidification behaviour: it shortens the freezing range and reduces the grain size. The highest susceptibility is observed for Mg-1.5Zn-0.2Y alloy. It is caused by its coarse microstructure and relatively larger solidification range. In contrast, the lowest susceptibility is observed for Mg-1.5Zn-4Y alloy with a small equiaxed grain microstructure. In addition, the healing of hot cracks by the subsequent refilling of the remained liquid at the later stage of solidification is also beneficial for the alleviation of hot tearing susceptibility in Mg-1.5Zn-4Y alloy.

AB - The influences of Y (0.2, 2 and 4 wt.%) additions on the hot tearing behaviour of Mg-1.5Zn alloys were investigated using a constrained rod casting (CRC) apparatus equipped with a load cell and data acquisition system. The initiation of hot tearing was monitored during CRC experiments. It corresponds to a drop in load on the hot tearing curves. The experimental results indicate that, the hot tearing susceptibility defined by the total crack volume, which was measured by the wax penetration method, decreases with increasing the content of Y at a mould temperature of 250 °C. The reduced susceptibility is attributed to the effect of Y on the solidification behaviour: it shortens the freezing range and reduces the grain size. The highest susceptibility is observed for Mg-1.5Zn-0.2Y alloy. It is caused by its coarse microstructure and relatively larger solidification range. In contrast, the lowest susceptibility is observed for Mg-1.5Zn-4Y alloy with a small equiaxed grain microstructure. In addition, the healing of hot cracks by the subsequent refilling of the remained liquid at the later stage of solidification is also beneficial for the alleviation of hot tearing susceptibility in Mg-1.5Zn-4Y alloy.

KW - Casting

KW - Hot tearing

KW - Mg-Zn-Y alloys

KW - Microstructure

KW - Solidification

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=84883004880&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/a19af803-e539-37c1-a752-5ceb9640d679/

U2 - 10.4028/www.scientific.net/MSF.765.306

DO - 10.4028/www.scientific.net/MSF.765.306

M3 - Article in conference proceedings

AN - SCOPUS:84883004880

SN - 9783037857663

T3 - Materials Science Forum

SP - 306

EP - 310

BT - Light Metals Technology 2013

A2 - Stone, Ian

A2 - McKay, Brian

A2 - Fan, Zhongyun

PB - Trans Tech Publications Ltd

T2 - 6th International Light Metals Technology Conference - LMT 2013

Y2 - 24 July 2013 through 26 July 2013

ER -