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Method of forming berryllium bearing metallic glass

  • US 5,368,659 A
  • Filed: 02/18/1994
  • Issued: 11/29/1994
  • Est. Priority Date: 04/07/1993
  • Status: Expired due to Term
First Claim
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1. A method for making a metallic glass having at least 50% amorphous phase comprising the steps of:

  • forming an alloy having the formula
    
    
    space="preserve" listing-type="equation">(Zr.sub.1-x Ti.sub.x).sub.a1 ETM.sub.a2 (Cu.sub.1-y Ni.sub.y).sub.b1 LTM.sub.b2 Be.sub.cwhere x and y are atomic fractions, and a1, a2, b1, b2, and c are atomic percentages, wherein;

    ETM is at least one early transition metal selected from the group consisting of V, Nb, Hf, and Cr, wherein the atomic percentage of Cr is no more than 0.2 a1;

    LTM is a late transition metal selected from the group consisting of Fe, Co, Mn, Ru, Ag and Pd;

    a2 is in the range of from 0 to 0.4a1;

    x is in the range of from 0 to 0.4; and

    y is in the range of from 0 to 1; and

    (A) when x is in the range of from 0 to 0.15;

    (a1+a2) is in the range of from 30 to 75%,(b1+b2) is in the range of from 5 to 62%,b2 is in the range of from 0 to 25%, andc is in the range of from 6 to 47%;

    (B) when x is in the range of from 0.15 to 0.4;

    (a1+a2) is in the range of from 30 to 75%,(b1+b2) is in the range of from 5 to 62%,b2 is in the range of from 0 to 25%, andc is in the range of from 2 to 47%; and

    cooling the entire alloy from above its melting point to a temperature below its glass transition temperature at a sufficient rate to prevent formation of more than 50% crystalline phase.

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