This preview shows page 1. Sign up to view the full content.
Unformatted text preview: hanical properties, however, the extrusion rate of
this alloy is somewhat slower, and hence production costs
can be expected to be higher. So the trade-off is whether
the improvements in mechanical properties, weldability,
and corrosion resistance from the scandium addition to
the 7xxx alloy are sufﬁcient to overcome some increase
in material cost. To date, scandium has only been used in
relatively small quantities in high performance sporting
goods such as baseball bats and archery arrows, and it
remains to be established how widespread the use of
these alloys will become. As the construction techniques
of the advanced trains become more akin to aerospace
technology, it could well be that the scandium modiﬁed
7xxx alloy could provide some signiﬁcant system
advantage. For example, a higher strength extrusion
(due to the addition of a scandium-containing alloy)
when used to build a total assembly might enable certain
design improvements such as the need for less material
resulting in a lighter, more fuel efﬁcient system.
View Full Document
This note was uploaded on 01/27/2014 for the course CM 312 taught by Professor Mariowriedt during the Spring '10 term at Clarkson University .
- Spring '10