Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys

M. G POKORNY; C. A MONROE; C BECKERMANN; Z ZHEN; N HORT

doi:10.1007/s11661-010-0367-3

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Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys

Journal article

Open access

Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys

M. G POKORNY, C. A MONROE, C BECKERMANN, Z ZHEN and N HORT

Metallurgical and materials transactions. A, Physical metallurgy and materials science, Vol.41(12), pp.3196-3207

2010

DOI: 10.1007/s11661-010-0367-3

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Abstract

A viscoplastic stress model is used to predict contraction forces measured during casting of two binary Mg-Al alloys. Force measurements from castings that did not hot tear, together with estimates from data found in the literature, are used to obtain the high-temperature mechanical properties needed in the stress model. In the absence of hot tearing, the simulation results show reasonably good agreement with the measurements. It is found that coherency of the semisolid mush starts at a solid fraction of about 0.5 and that the maximum tensile strength for the Mg-1 and 9 wt pct Al alloys at their final solidification temperatures is 1.5 and 4 MPa, respectively. In the presence of hot tearing, the measured stresses are generally overpredicted, which is attributed to the lack of a fracture model for the mush. Based on the comparison of measured and predicted stresses, it is also shown that coupling of the stress model to feeding flow and macrosegregation calculations is needed in order to accurately predict stresses in the presence of hot tearing.

Applied Sciences

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Metals. Metallurgy

Exact sciences and technology

Details

Title: Subtitle: Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys
Creators: M. G POKORNY - Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA 52242, United States
C. A MONROE - Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA 52242, United States
C BECKERMANN - Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA 52242, United States
Z ZHEN - Magnesium Innovation Center-MagIC, GKSS Research Center, Geesthacht, Germany
N HORT - Magnesium Innovation Center-MagIC, GKSS Research Center, Geesthacht, Germany
Resource Type: Journal article
Publication Details: Metallurgical and materials transactions. A, Physical metallurgy and materials science, Vol.41(12), pp.3196-3207
DOI: 10.1007/s11661-010-0367-3
ISSN: 1073-5623
eISSN: 1543-1940
Publisher: Springer; New York, NY
Language: English
Date published: 2010
Academic Unit: Mechanical Engineering
Record Identifier: 9984064113902771

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