<p>The application aluminum sheet alloy for light vehicle development was limited
by the high cost of alloy fabrication. The impurity iron, which is easily picked up during
fabrication, deteriorates its formability. The sheet alloy produced by continuous casting
techniques was showing lower in-service performance than the one produced with
traditional high-cost direct-chill casting technique. Therefore, enhancing the general
formability of the aluminum alloy became .the aim of many researchers and engineers in
past decades.</p><p>This project was launched to detect a possible modification effect of rare-earth
(RE) element on a Al-Mg-Fe alloy, which is a simplified AA5754 alloy. Cerium was
chosen as the RE element to test with. The influence of this rare-earth element on the
alloy grain microstructure, phase morphology, and corresponding mechanical behavior
was investigated.</p><p>It was found that cerium had a modification effect on the phase morphology to
some extent. Its addition provided a great grain refinement in as-cast alloys. However,
after thermo-mechanical processing, this effect would be eliminated by the small broken
particles and recrystallized fine grains. It was found that the mechanical performance of the cerium-containing AA5754 was neither enhanced nor deteriorated. The AA5754 alloy
remained non-heat-treatable after the addition of cerium.</p> / Thesis / Master of Applied Science (MASc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/21797 |
| Date | 09 1900 |
| Creators | Yan, Xiaofei |
| Contributors | Wilkinson, David, Malakhov, Dmitri, Materials Science and Engineering |
| Source Sets | McMaster University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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