Metallic glass alloys of Zr, Ti, Cu and Ni

A metallic glass object having a thickness of at least 0.5 mm in its smallest dimension formed of an alloy having the formula

• Ti.sub.a (ETM).sub.b (Cu.sub.1-x (LTM).sub.x).sub.x
• where ETM is selected from the group consisting of Zr and Hf, LTM is selected from the group consisting of Ni and Co, x is atomic fraction, and a, b, and c are atomic percentages, wherein
• a is in the range of from 19 to 41,
• b is in the range of from 4 to 21, and
• c is in the range of from 49 to 64 under the constraints of 2<x.cndot.c<14 and b<10+(11/17).cndot.(41-a);
• and
• under the constraints:
• when 49<c<50, then x.cndot.c<8;
• when 50<c<52, then x.cndot.c<9;
• when 52<c<54, then x.cndot.c<10;
• when 54<c<56, then x.cndot.c<12;
• and
• when c>56, then x.cndot.c<14.

A metallic glass object having a thickness of at least 0.5 mm in its smallest dimension formed of an alloy having the formula

• (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c
• where ETM is selected from the group consisting of Zr and Hf, x and y are atomic fractions, and a, b, and c are atomic percentages, wherein
• x is in the range of from 0.1 to 0.3,
• y.cndot.c is in the range of from 0 to 18,
• a is in the range of from 47 to 67,
• b is in the range of from 8 to 42, and
• c is in the range of from 4 to 37 under the following constraints:
• (i) when a is in the range of from 60 to 67 and c is in the range of from 13 to 32, b is given by:
• b.gtoreq.8+(12/7).cndot.(a-60);
• (ii) when a is in the range of from 60 to 67 and c is in the range of from 4 to 13, b is given by:
• b.gtoreq.20+(19/10).cndot.(76-a);
• and
• (iii) when a is in the range of from 47 to 55 and c is in the range of from 11 to 37, b is given by:
• b.ltoreq.8+(34/8).cndot.(55-a).

A method for making a metallic glass having at least 50% amorphous phase with the thickness of the glass being at least 0.5 mm in its smallest dimension comprising the steps of:

• formulating an alloy having the formula
• Ti.sub.a (ETM).sub.b (Cu.sub.1-x (LTM).sub.x).sub.c
• where ETM is selected from the group consisting of Zr and Hf, LTM is selected from the group consisting of Ni and Co, x is atomic fraction, and a, b, and c are atomic percentages, wherein
• a is in the range of from 19 to 41,
• b is in the range of from 4 to 21, and
• c is in the range of from 49 to 64 under the constraints of 2<x.cndot.c<14 and b<10+(11/17).cndot.(41-a);
• and
• under the constraints:
• when 49<c<50, then x.cndot.c<8;
• when 50<c<52, then x.cndot.c<9;
• when 52<c<54, then x.cndot.c<10;
• when 54<c<56, then x.cndot.c<12;
• when c>56, then x.cndot.c<14;
• and
• cooling the alloy sufficiently rapidly for remaining as a metallic glass at least 0.5 mm thick.

A method for making a metallic glass having at least 50% amorphous phase with a thickness of at least 0.5 mm in its smallest dimension comprising the steps of:

• formulating an alloy having the formula
• (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c
• where ETM is selected from the group consisting of Zr and Hf, x and y are atomic fractions, and a, b, and c are atomic percentages, wherein
• x is in the range of from 0.1 to 0.3,
• y.cndot.c is in the range of from 0 to 18,
• a is in the range of from 47 to 67,
• b is in the range of from 8 to 42, and
• c is in the range of from 4 to 37 under the following constraints:
• (i) when a is in the range of from 60 to 67 and c is in the range of from 13 to 32, b is given by:
• b.ltoreq.9+(12/7).cndot.(a-60);
• (ii) when a is in the range of from 60 to 67 and c is in the range of from 4 to 13, b is given by:
• b.ltoreq.20+(19/10).cndot.(67-a);
• and
• (iii) when a is in the range of from 47 to 55 and c is in the range of from 11 to 37, b is given by:
• b.gtoreq.8+(34/8).cndot.(55-a);
• and
• cooling the alloy sufficiently rapidly for remaining as a metallic glass at least 0.5 mm thick.

A method for making a metallic glass having at least 50% amorphous phase with a thickness of at least one millimeter in its smallest dimension comprising the steps of:

• formulating an alloy having at least four elements including:
• titanium in the range of from 5 to 20 atomic percent,
• copper in the range of from 8 to 42 atomic percent,
• an early transition metal selected from the group consisting of zirconium and hafnium in the range of from 30 to 57 atomic percent;
• a late transition metal selected from the group consisting of nickel and cobalt in the range of from 4 to 37 atomic percent;
• and
• cooling the alloy sufficiently rapidly for remaining as a metallic glass at least 0.5 mm thick.

A metallic glass having an as cast thickness of at least one millimeter in its smallest dimension formed of an alloy comprising at least four elements including:

• about 34 atomic percent titanium;
• about 47 atomic percent copper;
• about 11 atomic percent zirconium;
• and
• about 8 atomic percent nickel.

A metallic glass having an as cast thickness of at least one millimeter in its smallest dimension formed of an alloy comprising at least four elements including:

• about 33.8 atomic percent titanium;
• about 45 atomic percent copper;
• about 11.3 atomic percent zirconium;
• and
• about 10 atomic percent nickel.