CN104342577A - Copper zinc aluminum memory alloy capable of improving hardness stability under hot and cold cycling - Google Patents
Copper zinc aluminum memory alloy capable of improving hardness stability under hot and cold cycling Download PDFInfo
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- CN104342577A CN104342577A CN201310334096.0A CN201310334096A CN104342577A CN 104342577 A CN104342577 A CN 104342577A CN 201310334096 A CN201310334096 A CN 201310334096A CN 104342577 A CN104342577 A CN 104342577A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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Abstract
The invention discloses a copper zinc aluminum memory alloy capable of improving hardness stability under hot and cold cycling, and belongs to the technical field of manufacturing of a copper-based shape memory alloy. The copper zinc aluminum memory alloy is characterized in that materials are weighed according to the proportion of 25 to 26 wt% of Zn, 3.5 to 4 wt% of Al, 0.2 to 1.0 wt% of composite additives and the balance Cu to be smelted in a medium frequency induction melting furnace; after the materials are all smelted, the temperature of the materials rises to 1280 DEG C to 1300 DEG C, and then the materials are casted into an ingot casting with the diameter of phi 80*150 mm; according to annealing treatment, the materials are heated to 820 DEG C to 840 DEG C, kept warm for 24 hours and then are cooled along with the furnace, then, a dezincification layer of 2 mm to 3 mm on the surface is removed, and the ingot casting is kept warm for two hours at the temperature of 820 DEG C to 840 DEG C and forged and rolled into bars of 40 *40 mm; according to heat treatment, the bars are kept warm for two hours at the temperature of 830 DEG C to 850 DEG C, then quenched into indoor-temperature engine oil, and kept warm for 0.5 hour in boiling water, and finally the bars are taken out to be cooled in an airing manner to the indoor temperature; and the hardness test is carried out on a manufactured sample
Description
Technical field
The invention belongs to copper-based memory alloy preparing technical field, refer in particular to a kind of CuZnAl shape memory alloy that can improve stiffness under cold cycling.
Background technology
Memorial alloy no matter in production technique, or all in constantly developing and development in the application of material and element, is applied to rapidly the fields such as national defence, automobile, machinery, the energy, traffic and biology.Wherein, copper-based memory alloy is the main Types of the memorial alloy found at present.Research in recent years shows memorial alloy except having shape memory, pseudoelasticity and high damping, also has good abrasion resistance properties.Memorial alloy has excellent abrasion resistance properties and is proposed in nineteen eighty-two by the former Russian scholar AkceAoB, but does not draw attention at that time.According to looked into document, to the research of memorial alloy polishing machine, on external main concentrated NiTi base alloy, report is rarely had to the research of Cu base memorial alloy polishing machine.The domestic report to this respect is few, and the Wear Resistance Mechanism of different scholars to memorial alloy has different opinions.CuZnAl shape memory alloy is as one of alloy with practical value of most in copper-based memory alloy, there is production technique simple, (price is only 1/10th of Ni-Ti system alloy) with low cost, there is good memory performance (being only second to Ni-Ti system alloy), its transformation temperature can regulate within the scope of-100 DEG C ~ 300 DEG C, and application prospect is boundless.As a kind of practicality material, CuZnAl shape memory alloy is in cold cycling process, inner generation is just against thermoelastic martensitic transformation, between martensite and parent phase, phase interface moves repeatedly with the change of outside temperature, and Interfacial Dislocations constantly increases in transition process, and dislocation desity reaches capacity value very soon, thus impact is just against the transformation amount of thermoelastic martensitic transformation, cause shape memory poor stability, had a strong impact on friction and wear behavior, significantly limit range of application.For metallic substance, the quality of hardness number directly affects the friction and wear behavior of material, wants to improve to improve hardness and the stiffness thereof that the friction and wear behavior of CuZnAl shape memory alloy in cold cycling process must improve memorial alloy.
The present invention develops and refers to a kind of CuZnAl shape memory alloy that can improve stiffness under cold cycling.
Summary of the invention
The present invention develops and refers to a kind of CuZnAl shape memory alloy that can improve stiffness under cold cycling, it is characterized by: with electrolytic copper, No. 0, zinc ingot metal, No. A00, industrial aluminium ingot, composite additive (wherein: Ni8 ~ 12 wt%, Ti8 ~ 12 wt%, Ce7 ~ 10wt%, La7 ~ 10wt%, V6 ~ 9wt%, Ba6 ~ 9wt%, Zr5 ~ 7wt%, Tb 4 ~ 6wt%, Nd 4 ~ 6wt%, Pr 2 ~ 4wt%, B2 ~ 4wt%, remaining for Cu.) be raw material, namely Zn25-26wt%, Al3.5-4wt%, composite additive 0.2-1.0wt%, surplus are meltings in medium frequency induction melting furnace after the ratio of Cu is weighed.Melting technology is: first add preheated electrolytic copper, zinc ingot metal, aluminium ingot, composite additive, will add the borax of weight alloy 0.2% between melting period.After material all melts, be warming up to 1280-1300 DEG C and pour into the ingot casting that diameter is φ 80 × 150mm.Anneal is heated to 820-840 DEG C of insulation furnace cooling after 24 hours, then removes the dezincify layer of surperficial 2-3mm, then ingot casting is forged into the bar of 40 × 40mm 820-840 DEG C of insulation after 2 hours.Finally heat-treat: oil quenching adds timeliness, namely 830-850 DEG C of insulation is quenched in room temperature machine oil for 2 hours, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared boiling water.CuZnAl shape memory alloy stiffness prepared by the method is significantly improved.
Bar is processed into national standard coupon, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, records memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB after this processing method process.Sample on bar, go out cold cycling sample by linear cutter, cold cycling sample final size is long 40 mm, wide 10 mm, high 5mm.Resistance furnace heating is adopted to carry out thermal cycling test from constraint thermal cycling test machine.Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes.Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 300 DEG C, 400 DEG C, 500 DEG C, adopts counter to carry out Auto-counting, adjust and keep furnace temperature accurate, water temperature 20 DEG C (flowing tap water).Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 15s, until predetermined cycle index.Every cycle sets number of times, takes off sample, and surface film oxide is removed in polishing, the Brinell hardness number of beta alloy sample.
embodiment
embodiment 1
With electrolytic copper, No. 0, zinc ingot metal, No. A00, industrial aluminium ingot, composite additive (wherein: Ni8 ~ 12 wt%, Ti8 ~ 12 wt%, Ce7 ~ 10wt%, La7 ~ 10wt%, V6 ~ 9wt%, Ba6 ~ 9wt%, Zr5 ~ 7wt%, Tb 4 ~ 6wt%, Nd 4 ~ 6wt%, Pr 2 ~ 4wt%, B2 ~ 4wt%, remaining for Cu.) be raw material, namely Zn25-26wt%, Al3.5-4wt%, composite additive 0.2-1.0wt%, surplus are meltings in medium frequency induction melting furnace after the ratio of Cu is weighed.Melting technology is: first add preheated electrolytic copper, zinc ingot metal, aluminium ingot, composite additive, will add the borax of weight alloy 0.2% between melting period.After material all melts, be warming up to 1280-1300 DEG C and pour into the ingot casting that diameter is φ 80 × 150mm.Anneal is heated to 820-840 DEG C of insulation furnace cooling after 24 hours, then removes the dezincify layer of surperficial 2-3mm, then ingot casting is forged into the bar of 40 × 40mm 820-840 DEG C of insulation after 2 hours.Finally heat-treat: oil quenching adds timeliness, namely 830-850 DEG C of insulation is quenched in room temperature machine oil for 2 hours, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared boiling water.Bar is processed into national standard coupon, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, records memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB after this processing method process.Sample on bar, go out cold cycling sample by linear cutter, cold cycling sample final size is long 40 mm, wide 10 mm, high 5mm.Resistance furnace heating is adopted to carry out thermal cycling test from constraint thermal cycling test machine.Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes.Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 300 DEG C, adopts counter to carry out Auto-counting, adjust and keeps furnace temperature accurately, water temperature 20 DEG C (flowing tap water).Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 15s, until predetermined cycle index.Every cycle sets number of times, takes off sample, and surface film oxide is removed in polishing, and the Brinell hardness number of beta alloy sample is as shown in table 1.
embodiment 2
With electrolytic copper, No. 0, zinc ingot metal, No. A00, industrial aluminium ingot, composite additive (wherein: Ni8 ~ 12 wt%, Ti8 ~ 12 wt%, Ce7 ~ 10wt%, La7 ~ 10wt%, V6 ~ 9wt%, Ba6 ~ 9wt%, Zr5 ~ 7wt%, Tb 4 ~ 6wt%, Nd 4 ~ 6wt%, Pr 2 ~ 4wt%, B2 ~ 4wt%, remaining for Cu.) be raw material, namely Zn25-26wt%, Al3.5-4wt%, composite additive 0.2-1.0wt%, surplus are meltings in medium frequency induction melting furnace after the ratio of Cu is weighed.Melting technology is: first add preheated electrolytic copper, zinc ingot metal, aluminium ingot, composite additive, will add the borax of weight alloy 0.2% between melting period.After material all melts, be warming up to 1280-1300 DEG C and pour into the ingot casting that diameter is φ 80 × 150mm.Anneal is heated to 820-840 DEG C of insulation furnace cooling after 24 hours, then removes the dezincify layer of surperficial 2-3mm, then ingot casting is forged into the bar of 40 × 40mm 820-840 DEG C of insulation after 2 hours.Finally heat-treat: oil quenching adds timeliness, namely 830-850 DEG C of insulation is quenched in room temperature machine oil for 2 hours, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared boiling water.Bar is processed into national standard coupon, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, records memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB after this processing method process.Sample on bar, go out cold cycling sample by linear cutter, cold cycling sample final size is long 40 mm, wide 10 mm, high 5mm.Resistance furnace heating is adopted to carry out thermal cycling test from constraint thermal cycling test machine.Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes.Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 400 DEG C, adopts counter to carry out Auto-counting, adjust and keeps furnace temperature accurately, water temperature 20 DEG C (flowing tap water).Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 15s, until predetermined cycle index.Every cycle sets number of times, takes off sample, and surface film oxide is removed in polishing, and the Brinell hardness number of beta alloy sample is as shown in table 1.
embodiment 3
With electrolytic copper, No. 0, zinc ingot metal, No. A00, industrial aluminium ingot, composite additive (wherein: Ni8 ~ 12 wt%, Ti8 ~ 12 wt%, Ce7 ~ 10wt%, La7 ~ 10wt%, V6 ~ 9wt%, Ba6 ~ 9wt%, Zr5 ~ 7wt%, Tb 4 ~ 6wt%, Nd 4 ~ 6wt%, Pr 2 ~ 4wt%, B2 ~ 4wt%, remaining for Cu.) be raw material, namely Zn25-26wt%, Al3.5-4wt%, composite additive 0.2-1.0wt%, surplus are meltings in medium frequency induction melting furnace after the ratio of Cu is weighed.Melting technology is: first add preheated electrolytic copper, zinc ingot metal, aluminium ingot, composite additive, will add the borax of weight alloy 0.2% between melting period.After material all melts, be warming up to 1280-1300 DEG C and pour into the ingot casting that diameter is φ 80 × 150mm.Anneal is heated to 820-840 DEG C of insulation furnace cooling after 24 hours, then removes the dezincify layer of surperficial 2-3mm, then ingot casting is forged into the bar of 40 × 40mm 820-840 DEG C of insulation after 2 hours.Finally heat-treat: oil quenching adds timeliness, namely 830-850 DEG C of insulation is quenched in room temperature machine oil for 2 hours, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared boiling water.Bar is processed into national standard coupon, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, records memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB after this processing method process.Sample on bar, go out cold cycling sample by linear cutter, cold cycling sample final size is long 40 mm, wide 10 mm, high 5mm.Resistance furnace heating is adopted to carry out thermal cycling test from constraint thermal cycling test machine.Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes.Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 500 DEG C, adopts counter to carry out Auto-counting, adjust and keeps furnace temperature accurately, water temperature 20 DEG C (flowing tap water).Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 15s, until predetermined cycle index.Every cycle sets number of times, takes off sample, and surface film oxide is removed in polishing, and the Brinell hardness number of beta alloy sample is as shown in table 1.
Brinell hardness change in table 1 CuZnAl memorial alloy cold cycling process
Claims (2)
1. can improve a CuZnAl shape memory alloy for stiffness under cold cycling, it is characterized by: with electrolytic copper, No. 0, zinc ingot metal, No. A00, industrial aluminium ingot, composite additive Ni8 ~ 12 wt%, Ti8 ~ 12 wt%, Ce7 ~ 10wt%, La7 ~ 10wt%, V6 ~ 9wt%, Ba6 ~ 9wt%, Zr5 ~ 7wt%, Tb 4 ~ 6wt%, Nd 4 ~ 6wt%, Pr 2 ~ 4wt%, B2 ~ 4wt%, remaining for Cu; For raw material, namely Zn25-26wt%, Al3.5-4wt%, composite additive 0.2-1.0wt%, surplus are meltings in medium frequency induction melting furnace after the ratio of Cu is weighed; Melting technology is: first add preheated electrolytic copper, zinc ingot metal, aluminium ingot, composite additive, will add the borax of weight alloy 0.2% between melting period; After material all melts, be warming up to 1280-1300 DEG C and pour into the ingot casting that diameter is φ 80 × 150mm; Anneal be heated to 820-840 DEG C insulation 24 hours after furnace cooling, then remove the dezincify layer of surperficial 2-3mm, then by ingot casting 820-840 DEG C insulation 2 hours after forge the bar adding and be rolled into 40 × 40mm; Finally heat-treat: oil quenching adds timeliness, namely 830-850 DEG C of insulation is quenched in room temperature machine oil for 2 hours, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared boiling water; Bar is processed into national standard coupon, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, records memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB after this processing method process; Sample on bar, go out cold cycling sample by linear cutter, cold cycling sample final size is long 40 mm, wide 10 mm, high 5mm; Resistance furnace heating is adopted to carry out thermal cycling test from constraint thermal cycling test machine; Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes; Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 300 DEG C, 400 DEG C, 500 DEG C, adopts counter to carry out Auto-counting, adjust and keeps furnace temperature accurate, and water temperature 20 DEG C flows tap water; Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 15s, until predetermined cycle index; Every cycle sets number of times, takes off sample, and surface film oxide is removed in polishing, the Brinell hardness number of beta alloy sample.
2. a kind of CuZnAl shape memory alloy that can improve stiffness under cold cycling according to claim 1, this alloy room temperature 20 DEG C to 500 DEG C and between carry out cold cycling time hardness stabilization performance excellent.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136806A (en) * | 2018-11-09 | 2019-01-04 | 中国石油大学(华东) | NiTi monocrystalline cycle heat treatment preparation method under a kind of solid-state |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136806A (en) * | 2018-11-09 | 2019-01-04 | 中国石油大学(华东) | NiTi monocrystalline cycle heat treatment preparation method under a kind of solid-state |
| CN109136806B (en) * | 2018-11-09 | 2020-12-25 | 中国石油大学(华东) | Preparation method of NiTi monocrystal in solid state by cyclic heat treatment |
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Application publication date: 20150211 |