Method for forming biaxially textured articles by powder metallurgy
AssigneeUT-Battelle, LLC
InventorsAmit Goyal, Robert K. Williams, Donald M. Kroeger
Life of this patent
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Abstract
A method of preparing a biaxially textured alloy article comprises the steps of preparing a mixture comprising Ni powder and at least one powder selected from the group consisting of Cr, W, V, Mo, Cu, Al, Ce, YSZ, Y, Rare Earths, (RE), MgO, CeO2, and Y2O3; compacting the mixture, followed by heat treating and rapidly recrystallizing to produce a biaxial texture on the article. In some embodiments the alloy article further comprises electromagnetic or electro-optical devices and possesses superconducting properties.
Claims61
A method of preparing a biaxially textured alloy article having less magnetism than that of pure Ni comprising the steps of:
- a forming a powder mixture comprising a binary mixture selected from the group of mixtures consisting of:
- between 99 at % and 80 at % Ni powder and between 1 at % and 20 at % Cr powder;
- between 99 at % and 80 at % Ni powder and between 1 at % and 20 at % W powder;
- between 99 at % and 80 at % Ni powder and between 1 at % and 20 at % V powder;
- between 99 at % and 80 at % Ni powder and between 1 at % and 20 at % Mo powder;
- between 99 at % and 60 at % Ni powder and between 1 at % and 40 at % Cu powder;
- between 99 at % and 80 at % Ni powder and between 1 at % and 20 at % Al powder;
- b compacting the mixture to form a raw article;
- c heat treating the raw article to form a sintered article and to obtain a grain size which is fine and homogeneous;
- d rolling the sintered article to a degree of deformation greater than 90% to form a deformed article;
- and
- e rapidly recrystallizing the deformed article at a temperature below its secondary recrystallization temperature and higher than its primary recrystallization temperature to produce a dominant cube oriented, {100}<100> orientation texture, the article further having a Curie temperature less than that of pure Ni.
A method of preparing a non-magnetic biaxially textured alloy article having less magnetism than pure Ni comprising the steps of:
- a forming a powder mixture comprising a ternary mixture selected from the group of mixtures consisting of:
- Ni powder, Cu powder, and Al powder;
- Ni powder, Cr powder, and Al powder;
- Ni powder, W powder and Al powder;
- Ni powder, V powder, and Al powder;
- Ni powder, Mo powder, and Al powder;
- b compacting the mixture to form a raw article;
- c heat treating the raw article to form a sintered article and to obtain a grain size which is fine and homogeneous;
- d rolling the sintered article to a degree of deformation greater than 90% to form a deformed article;
- and
- e rapidly recrystallizing the deformed article at a temperature below its secondary recrystallization temperature and higher than its primary recrystallization temperature to produce a dominant cube oriented {100}<100> orientation texture, the article having a Curie temperature less than that of pure Ni.
A method of preparing a biaxially textured alloy article having less magnetism than that of pure Ni comprising the steps of:
- a forming a powder mixture comprising at least 60 at % Ni powder and at least one of Cr powder, W powder, V powder, Mo powder, Cu powder, Al powder, Ce powder, YSZ powder, Y powder, Mg powder, and RE powder;
- b compacting the powder mixture to form a raw article;
- c heat treating the raw article to form a sintered article characterized by a sintered network of Ni, the elements being essentially undiffused with each other;
- d rolling the sintered article to a degree of deformation greater than 90% to form a deformed article;
- e rapidly recrystallizing the deformed article at a temperature below the secondary recrystallization temperature and higher than the primary recrystallization of the Ni to produce a dominant cube oriented {100}<100> orientation texture, the article having a Curie temperature less than that of pure Ni;
- and
- f epitaxially depositing on the dominant cube oriented {100}<100> orientation textured surface a layer selected from the group consisting of oxide layers and nitride layers.
A method of preparing a strengthened biaxially textured article having less magnetism than that of pure Ni comprising the steps of:
- a forming a powder mixture selected from the group consisting of the following metals and alloys:
- Ni, Ag, Ag—Cu, Ag—Pd, Ni—Cu, Ni—V, Ni—Mo, Ni—Al, NiCr—Al, Ni—W—Al, Ni—V—Al, Ni—Mo—Al, Ni—Cu—Al;
- and at least one fine powders;
- selected from the group consisting of metal oxides, metal nitrides, and metal carbides,
- b compacting the mixture to form a raw article;
- c heat treating the raw article to form a sintered article and to obtain a grain size which is fine and homogeneous;
- d rolling the sintered article to a degree of deformation greater than 90% to form a deformed article;
- and
- e rapidly recrystallizing the deformed article to produce a dominant cube oriented {100}<100> orientation texture, the article having a Curie temperature less than that of pure Ni.
A method of preparing a strengthened biaxially textured alloy article comprising the steps of:
- a forming a powder mixture comprising at least one of the group consisting of Ni, Cu, Ag metals and alloys thereof;
- and at least one of the group consisting of internally oxidizable alloying elements,
- b compacting the mixture to form a raw article;
- c heat treating the raw article to form a sintered article and to obtain a grain size which is fine and homogeneous and to convert the oxidizable element into a homogeneously distributed oxide phase within the article;
- d rolling the sintered article to a degree of deformatin later than 90% to form a deformed article;
- and
- e rapidly recrystallizing the deformed article at a temperature below its secondary recrystallization temperature and higher than its primary recrystallization temperature to produce a dominant cube oriented {100}<100> orientation texture, the article having a Curie temperature less than that of pure Ni.
Dependencies are inferred from the claim text.