Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C45/00—Amorphous alloys
  • C22C45/04—Amorphous alloys with nickel or cobalt as the major constituent

Definitions

• This invention relates to amorphous metal alloys that include metalloid elements.
• Metallic glasses generally show resistivities greater than 100 micro ohm cm, whereas crystalline and polycrystalline magnetic metals generally show sesistivities below 50 micro ohm cm. Also, because of their randomly disordered structures, metallic glasses are typically isotropic in their physical properties, including their magnetization. Because of these two characteristics, metallic glasses have an initial advantage over conventional magnetic metals. However, metallic glasses do not generally show zero magnetostriction. When zero magnetostriction glasses can be found they are generally good soft magnetic metals (R.C. O'Handley, B.A.
• the present invention provides low magnetostriction and zero magnetostriction glassy alloys that are easy to fabricate and thermally stable.
• the alloys are at least 50 percent glassy and consist essentially of compositions defined by the formula (Ni 0.5 Co 0.5-x T x ) 100-b M b , where T is at least one of Mn, Cr and V, B is at least one of B, Si, P, C and Ge, x is less than 0.25, and b ranges from 17 to 22 atom percent , said alloy containing up to 2 atom percent of at least one of B, Si, P, C and Ge, having a value of magnetostriction of about -8 x 10 -6 to +2 x 10 -6 and a saturation induction of about 0.3 to 0.8T, or by the formula (Ni 0.75 Co 0.25-x T x ) 100-b M b , where T is at least one of Mn, Cr and V, M is at least one of B, Si, P, C and Ge,
• M is essentially boron
• the amorphous alloys of the invention can be formed by cooling a melt of the composition at a rate of at least about 10 5 °C/sec.
• a variety of techniques are available, as is now well-known in the art, for fabricating splat-quenched foils and rapid-quenched continuous ribbons, wire, sheet, etc.
• a particular composition is selected, powders of the requisite elements (or of materials that decompose to form the elements, such as nickel-borides, etc.) in the desired proportions are melted and homogenized, and the molten alloy is rapidly quenched either on a chill surface, such as a rotating cooled cylinder, or in a suitable fluid medium, such as a chilled brine solution.
• the amorphous alloys may be formed in air. However, superior mechanical properties are achieved by forming these amorphous alloys in a partial vacuum with absolute pressure less than about 5.5 cm of Hg, and preferably about 100 gm to 1 cm of Hg, as disclosed in U.S. Patent No. 4,154,283 to Ray et al.
• the amorphous metal alloys are at least 50 per cent amorphous, and preferably at least 80 per cent amorphous, as measured by X-ray diffraction. However, a substantial degree of amorphousness approaching 100 per cent amorphous is obtained by forming these amorphous metal alloys in a partial vacuum. Ductility is thereby improved, and such alloys possessing a substantial degree of amorphousness are accordingly preferred.
• Ribbons of these alloys find use in soft magnetic applications and in applications requiring low magnetostriction, high thermal stability (e.g., stable up to about 100°C) and excellent fabricability.
• Ni-rich glasses are easily made and are more stable if the "late" transition metal Ni is balanced to a certain extent by an "early" TM, e.g., Mn, Cr, V.
• TM e.g., Mn, Cr, V.
• examples of such glasses include Ni 50 Mn 30 B 20 , Ni 60 Cr 20 B 20 , or Ni 70 V 10 B 20 .

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Soft Magnetic Materials (AREA)

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Cited By (14)

Citations (3)

• 1981
  • 1981-11-26 EP EP85101589A patent/EP0161393A1/fr not_active Withdrawn

Patent Citations (3)

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