Composition and method for alloy having improved stress relaxation resistance
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United States of America Patent
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Apr 8, 2014
Grant Date -
Mar 28, 2013
app pub date -
Nov 13, 2012
filing date -
Sep 21, 2006
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Abstract
A nickel based alloy coating and a method for applying the nickel based alloy as a coating to a substrate. The nickel based alloy comprises about 0.1-15% rhenium, about 5-55% of an element selected from the group consisting of cobalt, iron and combinations thereof, sulfur included as a microalloying addition in amounts from about 100 parts per million (ppm) to about 300 ppm, the balance nickel and incidental impurities. The nickel-based alloy of the present invention is applied to a substrate, usually an electro-mechanical device such as a MEMS, by well-known plating techniques. However, the plating bath must include sufficient sulfur to result in deposition of 100-300 ppm sulfur as a microalloyed element. The coated substrate is heat treated to develop a two phase microstructure in the coating. The microalloyed sulfur-containing nickel-based alloy of the present invention includes a second phase of sulfide precipitates across the grain (intragranular) that improves the stress-relaxation resistance of the alloy.
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