Hot tearing behaviour of binary Mg-1Al alloy using a contraction force measuring method
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In: International Journal of Cast Metals Research, Vol. 22, No. 1-4, 08.2009, p. 331-334.
Research output: Journal contributions › Journal articles › Research › peer-review
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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 -