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US 6,875,293 B2Granted
Method of forming molded articles of amorphous alloy with high elastic limit
AssigneeLiquidmetal Technologies, Inc.
InventorAtakan Peker
Life of this patent
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Abstract
A method for forming molded articles of bulk-solidifying amorphous alloys around the glass transition range, which preserves the high elastic limit of the bulk solidifying amorphous alloy upon the completion of molding process is provided. The method comprising providing a feedstock of bulk solidifying amorphous alloy, then molding the amorphous alloy feedstock around the glass transition range to form a molded article according to the current invention which retains an elastic limit of at least 1.2%.
Claims25
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the ΔTsc of the feedstock is more than 90° C., and the maximum molding temperature is given by a value selected from the group consisting of (Tsc+½ ΔTsc), (Tsc+¼ ΔTsc), and Tsc.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the ΔTsc of the feedstock is more than 60° C. and less than 90° C., and the maximum molding is given by a value selected from the group consisting of (Tsc+¼ ΔTsc), Tsc, and Tg.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the ΔTsc of the feedstock is more than 30° C. and less than 60° C., and the maximum molding is given by a value selected from the group consisting of Tsc, Tg, and Tg−30.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 an ΔH2) and wherein the composition of the bulk solidifying amorphous alloy is selected such that the ΔH1 is larger from each of the subsequent enthalpies of crystallization and ΔH1/ΔT1>2.0·ΔH2/ΔT2.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 an ΔH2) and wherein ΔH1/ΔT1>0.5·ΔH2/ΔT2 and the ΔTsc of the feedstock is more than 90° C., then the maximum molding temperature is given by (Tsc).
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least enthalpies of crystallization (ΔH1 and ΔH2) and wherein ΔH1/ΔT1>0.5·ΔH2/ΔT2 and the ΔTsc of the feedstock is more than 60° C. and less than 90° C., then the maximum molding temperature is given by (Tg).
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 an ΔH2) and wherein ΔH1/ΔT1>0.5·ΔH2/ΔT2 and the ΔTsc of the feedstock is more than 30*C. and less than 60° C., then the maximum molding temperature is given by (Tg−30).
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a thickness;
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a maximum specified permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article, wherein the thickness of the feedstock is sufficiently preserved over at least 20% of the surface area of the feedstock such that the molded article retains an elastic limit of at least 1.2%;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 an ΔH2) and wherein the composition of the bulk solidifying amorphous alloy is selected such that the ΔH1 is larger from each of the subsequent enthalpies of crystallization and ΔH1/ΔT1>2.0·ΔH2/ΔT2.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a thickness;
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a maximum specified permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article, wherein the thickness of the feedstock is sufficiently preserved over at least 20% of the surface area of the feedstock such that the molded article retains an elastic limit of at least 1.2%;
- and
- wherein the bulk solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 an ΔH2) and wherein the composition of the bulk solidifying amorphous alloy is selected such that the ΔH1 is larger from each of the subsequent enthalpies of crystallization and ΔH1/ΔT1>4.0·ΔH2/ΔT2.
2 more elements
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc
- wherein the bulk-solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at least two peak heat flows (ΔH1 and ΔH2), such that where ΔH1/ΔT1>2.0*ΔH2/ΔT2 then where ΔTsc is more than 90° C. then the maximum molding temperature is given by Tsc+¼ ΔTsc and the maximum molding time in minutes is given by 0.25 ΔTsc, where ΔTsc is more than 60° C. and less than 90° C. then the maximum molding temperature is given by Tsc and the maximum molding time in minutes is given by 0.25 ΔTsc, and where ΔTsc is more than 30° C. and less than 60° C. then the maximum molding temperature is given by Tg and the maximum molding time in minutes is given by 20.
1 more element
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc
- wherein the bulk-solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs at least two peak heat flows (ΔH1 and ΔH2), such that where ΔH1/ΔT1>4.0*ΔH2/ΔT2 then where ΔTsc is more than 90° C. then the maximum molding temperature is given by Tsc+½ ΔTsc and the maximum molding time in minutes is given by 0.5 ΔTsc, where ΔTsc is more than 60° C. and less than 90° C. then the maximum molding temperature is given by Tsc+¼ ΔTsc and the maximum molding time in minutes is given by 0.5 ΔTsc, and where ΔTsc is more than 30° C. and less than 60° C. then the maximum molding temperature is given by Tsc and the maximum molding time in minutes is given by 20+5 ΔTsc.
1 more element
A method of forming molded articles having high elastic limits comprising:
- providing a feedstock of bulk-solidifying amorphous alloy having a glass transition (Tg), a supercooled temperature (Tsc), and a crystallization temperature (Tx), where the difference between Tsc and Tx defines a supercooled temperature region (ΔTsc);
- heating the feedstock to a molding temperature
- molding the feedstock for a time less than a specified maximum permissible molding time at temperatures less than a specified maximum molding temperature around the glass transition temperature of the feedstock to form a molded article such that the molded article retains an elastic limit of at least 1.2%, wherein the maximum molding temperature is proportional to the size of the ΔTsc and wherein the specified permissible molding time is proportional to both the molding temperature and the ΔTsc
- wherein the bulk-solidifying amorphous alloy has at least two different crystallization steps which define at least two temperature ranges (ΔT1 and ΔT2) over which crystallization occurs and at two peak heat flows (ΔH1 and ΔH2), such that where ΔH1/ΔT1<0.5*ΔH2/ΔT2 then where ΔTsc is more than 90° C. then the maximum molding temperature is given by Tsc and the maximum molding time in minutes is given by 0.25 ΔTsc, where ΔTsc is more than 60° C. and less than 90° C. then the maximum molding temperature is given by Tg and the maximum molding time in minutes is given by 0.25 ΔTsc, and where ΔTsc is more than 30° C. and less than 60° C. then the maximum molding temperature is given by Tg and the maximum molding time in minutes is given by 20.
1 more element
Dependencies are inferred from the claim text.