BULK NICKEL-BASED CHROMIUM AND PHOSPHOROUS BEARING METALLIC GLASSES
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Abstract
Ni-based Cr- and P-bearing alloys that can from centimeter-thick amorphous articles are provided. Within the family of alloys, millimeter-thick bulk-glassy articles can undergo macroscopic plastic bending under load without fracturing catastrophically.
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Citations
64 Claims
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1-44. -44. (canceled)
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45. An alloy represented by the following formula:
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Ni(69−
w−
x−
y−
z)Cr8.5+wNb3+xP16.5+yB3+z,where w, x, y, and z are positive or negative atomic percentages that satisfy the condition;
0.033w2+0.44x2+2y2+0.32z2<
1, andwherein the critical rod diameter of the alloy is at least 3 mm. - View Dependent Claims (46, 47, 48, 49)
wherein the critical rod diameter of the alloy is at least 5 mm.
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47. The alloy of claim 45, wherein up to 1.5 atomic % of Nb is substituted by materials selected from the group consisting of Ta, V, or combinations thereof.
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48. The alloy of claim 45, wherein up to 2 atomic % of Cr is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.
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49. The alloy of claim 45, wherein up to 2 atomic % of Ni is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.
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50. A metallic glass comprising an alloy where a composition of the alloy is represented by the following formula:
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Ni(69−
w−
x−
y−
z)Cr8.5+wNb3+xP16.5+yB3+z,where w, x, y, and z are positive or negative atomic percentages that satisfy the condition;
0.033w2+0.44x2+2y2+0.32z2<
1, andwherein the critical rod diameter of the alloy is at least 3 mm. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59)
wherein the critical rod diameter of the alloy is at least 5 mm.
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52. The metallic glass of claim 50, wherein up to 1.5 atomic % of Nb is substituted by materials selected from the group consisting of Ta, V, or combinations thereof.
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53. The metallic glass of claim 50, wherein up to 2 atomic % of Cr is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.
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54. The metallic glass of claim 50, wherein up to 2 atomic % of Ni is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, Ti, Zr, Hf, or combinations thereof.
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55. The metallic glass alloy of claim 50, wherein the stress intensity at crack initiation KQ, when measured on a 3 mm diameter rod containing a notch with length between 1 and 2 mm and root radius between 0.1 and 0.15 mm, is at least 60 MPa m1/2.
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56. The metallic glass alloy of claim 50, wherein a rod formed of the materials having a diameter of at least 0.5 mm can undergo macroscopic plastic bending under load without fracturing catastrophically.
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57. The metallic glass alloy of claim 50, wherein the compressive yield strength, σ
- y, obtained using the 0.2% proof stress criterion is greater than 2000 MPa.
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58. The metallic glass alloy of claim 50, wherein the Poisson'"'"'s ratio is at least 0.35.
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59. The metallic glass of claim 50, wherein the corrosion rate in 6M HCl is not more than 0.01 mm/year.
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60. A method of producing a metallic glass comprising:
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melting an alloy into a molten state;
where the alloy has a composition represented by the following formula;
Ni(69−
w−
x−
y−
z)Cr8.5+wNb3+xP16.5+yB3+z,where w, x, y, and z are positive or negative atomic percentages that satisfy the condition;
0.033w2+0.44x2+2y2+0.32z2<
1; andquenching the melt at a cooling rate sufficiently rapid to prevent crystallization of the alloy. - View Dependent Claims (61, 62, 63, 64)
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Specification