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Unformatted text preview: ties, 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 friction stir welding, to improve the performance
of aluminum alloys for rail applications.14
While previous studies showed that scandium
additions improved weldability of 6061 alloy, this study
demonstrated that scandium additions reduced the
strength of 6061 and did not reﬁne the grain size. In the
case of the 5456 alloy, the addition of scandium did reﬁne
the grain structure and improve mechanical properties;
however, the intergranular corrosion performance was
In the case of the 7xxx alloy, however, scandium additions did signiﬁcantly improve mechanical properties,
weldability, and corrosion resistance. Because of higher
LIGHT METAL AGE, OCTOBER 2007 mec...
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