Mechanical and Fatigue Properties of Gravity Die-Cast A356 Aluminium Alloy with Addition of Scandium
A356 is widely used for the casting of high strength components in automotive, aerospace and other industrial applications. This is due to its high achievable strength, castability, light weight, good thermal and electrical conductivity. However, the as-cast A356 exhibits relative poor mechanical...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Published: |
IOP Publishing
2019
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| Subjects: | |
| Online Access: | http://eprints.intimal.edu.my/1387/ https://iopscience.iop.org/article/10.1088/1755-1315/268/1/012059 |
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| Summary: | A356 is widely used for the casting of high strength components in automotive,
aerospace and other industrial applications. This is due to its high achievable strength, castability,
light weight, good thermal and electrical conductivity. However, the as-cast A356 exhibits
relative poor mechanical properties due to the presence of coarse acicular eutectic silicon
morphology. In this study, Sc-modified-A356 and the effect of heat treatment have been studied
and compared with unmodified A356. Various amounts of Sc ranging from 0.2 wt% to 0.6 wt%
were added into the mixture of A356 aluminium alloy and the specimens were produced by using
gravity die-casting. Next, the ultimate tensile strength, Vickers hardness and fatigue behaviour
of the cast samples are examined. The results revealed that by adding 0.4 wt.% of Sc, the heat
treated sample is able to achieve ultimate tensile strength of above 300 MPa and Vicker’s
hardness of 118 HV. Furthermore, the fatigue properties of the 0.4 wt% Sc-A356 with T6 heat
treatment was found to be improved as compared to the unmodified A365 samples. |
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