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Unformatted text preview: eresting to note that the advanced trains are still
using these similar materials. For example, the Japanese
Shinkansen uses 5083 alloy, and also some 7075 material,
which is more frequently used as an aerospace material,
while the German Transrapid uses 5005 sheet for panels
and 6061, 6063, and 6005 for extrusions.
Recent Alloy Developments: Some recent research for
improved rail materials has been evaluating newer
aluminum alloys containing scandium additions.16
Scandium provides the highest amount of strengthening
per atom percent of any alloying element when added
to aluminum. Small additions (0.1-0.2 wt%) have been
shown to improve mechanical properties, reﬁne the
microstructures of wrought aluminum alloys, and improve
weldability by reducing hot cracking in the weld region.
Since all of these factors are relevant to rail applications
of aluminum, a study was conducted to establish whether
scandium-containing 5xxx, 6xxx, and 7xxx alloys could
be used in conjunction with advanced welding technology
such as fricti...
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- Spring '10