Intermetallic articles of manufacture having high room temperature ductility

a technology of intermetallic compounds and ductility, which is applied in the manufacture of final products, climate sustainability, prosthesis, etc., can solve the problems fracture toughness of room temperature, high compressive ductility of room temperature, and high compressive ductility of articles of manufacture. , to achieve the effect of high compressive ductility, high ductility and high compressive ductility

Inactive Publication Date: 2005-12-15
IOWA STATE UNIV RES FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] One embodiment of the present invention relates to articles of manufacture fabricated of intermetallic compounds selected from the group consisting of an RM compound and a higher order compound thereof having a B2 (CsCl-type) ordered crystal structure wherein R is one or more rare earth elements and M is one or more non-rare earth metals. The articles of manufacture have high ductility at ambient (room) temperature, such as for purposes of illustration only, at least about 5%, preferably about 10% and greater, tensile elongation prior to fracture when tensile tested at room temperature in ambient air. Similarly, the articles of manufacture exhibit high compressive ductilities and fracture toughness at room temperature in ambient air.
[0007] Another embodiment of the present invention relates to articles of manufacture fabricated of intermetallic compounds selected from the group consisting of a M′M compound and a higher order compound thereof having a B2 (CsCl-type) ordered crystal structure wherein M′ and M are one or more different non-rare earth metals. The articles of manufacture have high ductility at ambient (room) temperature, such as for purposes of illustration only, at least about 5%, preferably about 10% and greater, tensile elongation prior to fracture when tensile tested at room temperature in ambient air. Similarly, the articles of manufacture exhibit high compressive ductilities and fracture toughness at room temperature in ambient air.

Problems solved by technology

Similarly, the articles of manufacture exhibit high compressive ductilities and fracture toughness at room temperature in ambient air.
Similarly, the articles of manufacture exhibit high compressive ductilities and fracture toughness at room temperature in ambient air.

Method used

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  • Intermetallic articles of manufacture having high room temperature ductility
  • Intermetallic articles of manufacture having high room temperature ductility
  • Intermetallic articles of manufacture having high room temperature ductility

Examples

Experimental program
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Effect test

example 1

[0043] Polycrystalline specimens of equiatomic YAg were produced by arc-melting the pure elements on a water-cooled copper hearth in an inert gas (Ar) atmosphere to form an ingot in the shape of a finger or disk depending on the shape of the mold in the copper hearth. The specimens comprised 50 atomic % Y and 50 atomic % Ag. X-ray diffraction and metallography studies of the cast specimens confirmed that they were single-phase with fully ordered CsCl-type crystal structure. The cast specimens were annealed for 86 kiloseconds at 800 degrees C. and machined into cylindrical tensile test specimens, which were tensile tested to failure in room temperature air at a strain rate of 2×10−4 / second.

[0044]FIG. 2 is a representative stress-strain curve for the machined YAg specimens. Also shown in FIG. 2 is a stress-strain curve for a commercially available aluminum alloy (3105) widely used for gutters, downspouts, window frames and siding. The machined YAg specimen unexpectedly and surprising...

example 2

[0045] Polycrystalline specimens of nearly equiatomic YCu1.005 were produced by arc-melting the pure elements on a water-cooled copper hearth in an inert gas (Ar) atmosphere to form an ingot in the shape of a finger or disk depending on the shape of the mold in the copper hearth. This specimen was made with a starting composition of Y1.000Cu1.005 because small losses of Cu occur during arc-melting through vaporization, and this starting composition yields a final cast specimen that is close to the perfect 1:1 stoichiometry. X-ray diffraction and metallography studies of the cast specimens confirmed that they were single-phase with fully ordered CsCl-type crystal structure. The cast specimens were annealed for 36 kiloseconds at 700 degrees C. and machined into cylindrical tensile test specimens, which were tensile tested to failure in room temperature air at a strain rate of 2×10−4 / second.

[0046]FIG. 4 is a representative stress-strain curve for the machined YCu specimens. The machin...

example 3

[0047] Eight single crystal YCu tensile specimens were produced by the well known Bridgman (power-down) technique where a YCu melt in a mold or crucible is directionally solidified therein by gradually reducing induction heating power along the length of the melt to form a single crystal body. The tensile specimens were machined from the single crystal cast bodies and polished by 0.25 micron diamond abrasive in an oil suspension. All eight tensile specimens had a tensile axis of direction [142] with polished surfaces corresponding to the (−812) and (−2 6 −11) planes. The specimens were pulled in tension at room temperature (22 degrees C.) in air at a strain rate of 1×10−4 / second. The specimens exhibited a yield stress of 45 MPa and fractured at 6% to 8% elongation at a stress of 75 to 90 MPa.

[0048]FIG. 5 is an optical photomicrograph of slip bands on the surface of an YCu single crystal test specimen deformed 6% in tension at 22 degrees C. The intersecting lines are slip bands resu...

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Abstract

Article of manufacture fabricated by plastic deformation of an intermetallic compound comprising R and M, such as an RM intermetallic compound and a higher order compound thereof, having a CsCl-type ordered crystal structure wherein R is one or more rare earth elements and M is one or more non-rare earth metals. The article of manufacture has a tensile elongation of at least about 5% prior to fracture when tensile tested at room temperature in ambient air. The article of manufacture also can be fabricated by plastic deformation of an intermetallic compound comprising a M′M compound and a higher order compound thereof having a CsCl-type ordered crystal structure wherein M′ and M are one or more different non-rare earth metals.

Description

[0001] This application claims benefits of provisional application Ser. No. 60 / 425,964 filed Nov. 13, 2002.CONTRACTUAL ORIGIN OF THE INVENTION [0002] The United States Government has rights in this invention pursuant to Contract No. W-7405-Eng-82 between the Department of Energy and Iowa State University.FIELD OF THE INVENTION [0003] The present invention relates to articles of manufacture made of intermetallic compounds having relatively high ductility at room temperature. BACKGROUND OF THE INVENTION [0004] Intermetallic compounds, such as TiAl, Ni3Al, FeAl, ZrCo2 and others, are superior in several ways to conventional metals and alloys. Certain intermetallic compounds are stronger and stiffer at elevated temperature and provide better corrosion resistance than conventional metals and alloys. Some intermetallic compounds also possess exceptional magnetic properties and low densities. However, at room temperature, intermetallic compounds generally are brittle and have low fracture ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D7/00C22C1/02C22C5/06C22C28/00
CPCA44C27/002Y02P70/56C01B3/0031C01B3/0036C01B3/0047C01B3/0052C01B3/0057C01B3/0063C01B3/0068C01B3/503C01B3/505C01B3/508C21D7/00C21D2201/04C22C1/02C22C5/00C22C28/00F28F21/08H01M4/383H01M8/04216Y02E60/327A61L27/04Y02E60/10Y02E60/32Y02E60/50Y02P70/50
Inventor GSCHNEIDNER, KARL A. JR.TSOKOL, ALEXANDRA O.PECHARSKY, VITALIJ K.RUSSELL, ALAN M.
Owner IOWA STATE UNIV RES FOUND
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