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US 9,957,593 B2Granted
Ductile metal alloys, method for making ductile metal alloys
AssigneeU.S. Department of Energy
InventorBrian V. Cockeram
Life of this patent
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Abstract
A ductile alloy is provided comprising molybdenum, chromium and aluminum, wherein the alloy has a ductile to brittle transition temperature of about 300 C after radiation exposure. The invention also provides a method for producing a ductile alloy, the method comprising purifying a base metal defining a lattice; and combining the base metal with chromium and aluminum, whereas the weight percent of chromium is sufficient to provide solute sites within the lattice for point defect annihilation.
Claims12
An alloy, consisting of:
- purified molybdenum in solid solution with chromium, the purified molybdenum having less than 20 ppm carbon and 10 ppm oxygen, and further consisting of
- 11 ppm to 500 ppm aluminum,
- less than 15 ppm nitrogen, and
- 0.1 wt. % to 0.9 wt. % chromium, wherein
- the purified molybdenum is the solvent,
- the chromium is the solute, and
- the alloy has a ductile to brittle transition temperature of −194° C. to −150° C.
4 more elements
A method of forming an alloy, comprising:
- purifying molybdenum by heat treating the molybdenum in a reducing atmosphere until the purified molybdenum consists of less than 20 ppm carbon, less than 10 ppm oxygen, and less than 15 ppm nitrogen;
- adding between 11 ppm and 500 ppm aluminum to the purified molybdenum;
- and
- forming an alloy of the purified molybdenum, the aluminum, and between 0.1% wt and 0.9% wt chromium, wherein:
- the purified molybdenum is in solid solution with the chromium,
- the purified molybdenum is the solvent,
- the chromium is the solute, and
- the alloy has a ductile to brittle transition temperature of −194° C. to −150° C.
5 more elements
Dependencies are inferred from the claim text.