TY - JOUR

T1 - Hot tearing behaviour of binary Mg-1Al alloy using a contraction force measuring method

AU - Zhen, Z. S.

AU - Hort, N.

AU - Huang, Y. D.

AU - Utke, O.

AU - Petri, N.

AU - Kainer, K. U.

PY - 2009/8

Y1 - 2009/8

N2 - Hot tearing (or hot cracking) is recognised in the foundry industry as a serious defect. Although it has been investigated for decades, understanding still stands at a qualitative level. In this work, investigations on hot tearing in the binary Mg-1Al (wt-%) alloy have been conducted, using a contraction stress measuring method which shows evidence of good repeatability. The results show that increasing mould temperature decreases hot tearing susceptibility for Mg-1Al due to a decreased cooling rate. The recorded contraction force curves also show that hot cracks initiate under all investigated mould temperatures; however, the crack propagation behaves differently. At lower mould temperatures, the crack propagates very fast, while at higher mould temperatures it propagates slowly. This indicates that a lower cooling rate allows a better chance for the retained liquid to refill the crack. Consequently this leads to partial or complete interruption of crack propagation.

AB - Hot tearing (or hot cracking) is recognised in the foundry industry as a serious defect. Although it has been investigated for decades, understanding still stands at a qualitative level. In this work, investigations on hot tearing in the binary Mg-1Al (wt-%) alloy have been conducted, using a contraction stress measuring method which shows evidence of good repeatability. The results show that increasing mould temperature decreases hot tearing susceptibility for Mg-1Al due to a decreased cooling rate. The recorded contraction force curves also show that hot cracks initiate under all investigated mould temperatures; however, the crack propagation behaves differently. At lower mould temperatures, the crack propagates very fast, while at higher mould temperatures it propagates slowly. This indicates that a lower cooling rate allows a better chance for the retained liquid to refill the crack. Consequently this leads to partial or complete interruption of crack propagation.

KW - Castability

KW - Crack propagation

KW - Hot tearing

KW - Magnesium alloys

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=70350517955&partnerID=8YFLogxK

U2 - 10.1179/136404609X368145

DO - 10.1179/136404609X368145

M3 - Journal articles

AN - SCOPUS:70350517955

VL - 22

SP - 331

EP - 334

JO - International Journal of Cast Metals Research

JF - International Journal of Cast Metals Research

SN - 1364-0461

IS - 1-4

ER -