Functionally graded alloy, use thereof and method for producing same
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United States of America Patent
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Dec 11, 2001
Grant Date -
N/A
app pub date -
Jun 25, 1999
filing date -
Jun 26, 1998
priority date (Note) -
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Abstract
The functionally graded alloy having a composition comprising 3-10 weight % of Al, 5-20 weight % of Mn, the balance being substantially Cu and inevitable impurities has a first portion composed essentially of a .beta.-phase, a second portion composed essentially of an .alpha.-phase and a Heusler phase, and a third portion having a crystal structure changing continuously or stepwise from the first portion to the second portion. The functionally graded alloy can be produced by forming a copper-based alloy having the above composition, keeping it at 500.degree. C. or higher and rapidly cooling it, and then subjecting it to an aging treatment by a gradient temperature heater. Such functionally graded alloy can suitably be used for guide wires and catheters.
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