CN109355601B - Cobalt-based bulk amorphous alloy and preparation method thereof - Google Patents
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Abstract
The invention provides a catalyst represented by formula CoaWbBcThe cobalt-based bulk amorphous alloy is shown, wherein a, b and c are atomic percentages of corresponding elements; a is 54-70; b is 15-30; c is 12-19; a + b + c is 100. This applicationThe cobalt-based bulk amorphous alloy has ultrahigh strength, ultrahigh hardness, extremely high thermal stability, strong amorphous forming capability and good corrosion resistance and soft magnetic performance; experimental results show that the strength of the cobalt-based bulk amorphous alloy is 5500-6300 MPa, the glass transition temperature Tg is 844K-960K, and the corrosion current density in 3.5 wt/% NaCl solution is as low as 8 mu A/cm2。
Description
Technical Field
The invention relates to the technical field of amorphous alloys, in particular to a cobalt-based bulk amorphous alloy and a preparation method thereof.
Background
The bulk amorphous alloy is an amorphous alloy with three-dimensional sizes larger than 1 mm. The block amorphous alloy has a unique structure with long-range disorder and short-range order due to the atomic arrangement, so that the block amorphous alloy has extremely high strength and hardness, excellent corrosion resistance, wear resistance and the like, and shows good application prospects in the fields of aerospace, military, electronics, information and the like.
In a plurality of systems of the block amorphous alloy, the mechanical property of the cobalt-based block amorphous alloy is particularly outstanding. In 2003, Inoue et al, the university of northeast Japan, developed Co-Fe-Ta-B bulk amorphous alloys with fracture strengths as high as 5.2GPa, creating the world's highest strength record for metallic bulk materials at that time (Inoue A, Shen B L, Koshiba H, Kato H, Yavari AR, Nature Mater.2(2003) 661). Subsequently, a series of ultra-high strength bulk amorphous alloys were developed in succession. The most representative of them is Co with breaking strength up to 5GPa and ultrahigh amorphous forming ability (critical diameter up to 15mm) reported in 201143Fe5Cr15Mo14C15B6Er2The bulk amorphous alloy creates the record of the Co-based bulk amorphous alloy with the strongest amorphous forming ability (Zhang T, Yang Q, Ji Y F, Li R, Pang S J, Wang J F, Xu T, Chin. Sci. Bull.56(2011) 3972). 2011 Co developed by professor in Bei navigation billow55Ta10B35The fracture strength of the bulk amorphous alloy is up to 6GPa, and the highest strength record of the currently reported bulk metal material is created (Wang J, Li R, Hua N B, Zhang T, J.Mater.Res.26(2011) 2072). However, the room temperature compressive plastic strain of the alloy is only 0.5%, which severely limits the engineering application and further development. Subsequently, the Co-Nb-B bulk amorphous alloy developed by professor of shenbao has a breaking strength of up to 5230MPa, a room temperature compressive plastic strain of 5% and a critical amorphous forming ability of 2mm diameter (Dun T, LiuH S, ShenB L, j. non-crystalst. solids 358(2012) 3060).
In conclusion, the reported Co-based bulk amorphous alloy often contains noble metals such as Ta and Nb and rare earth elements, so that the raw material and preparation cost is greatly increased, and the large-scale application and development of the Co-based bulk amorphous alloy are seriously hindered. Meanwhile, most of Co-based bulk amorphous alloys contain various components, so that the preparation process and flow of the amorphous alloy are too complex, and the preparation process is not beneficial to being used as a model system for researching and developing ultrahigh-strength metal materials. Therefore, the development of a novel Co-based bulk amorphous alloy with low cost, ultrahigh strength, strong amorphous forming capability, high thermal stability and few components has great theoretical research value and practical application significance.
Disclosure of Invention
The invention aims to provide a cobalt-based bulk amorphous alloy with ultrahigh strength, larger amorphous forming capability, high thermal stability and excellent corrosion resistance.
In view of the above, the present application provides a cobalt-based bulk amorphous alloy represented by formula (i),
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝12～19；a+b+c＝100。
preferably, the atomic percentage of Co is 55-65.
Preferably, the atomic percentage of W is 20-30.
Preferably, the atomic percentage of B is 15-18.
Preferably, a is 63, b is 21, and c is 16.
Preferably, a is 59, b is 26, and c is 15.
Preferably, a is 56, b is 28, and c is 16.
The application also provides a preparation method of the cobalt-based bulk amorphous alloy, which comprises the following steps:
A) proportioning according to atomic percent of each element of the cobalt-based bulk amorphous alloy shown in formula (I);
B) smelting the raw materials obtained in the step A) to obtain a master alloy ingot;
C) carrying out water-cooling copper mold suction casting and rapid solidification cooling on the master alloy ingot to obtain a cobalt-based bulk amorphous alloy;
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝12～19；a+b+c＝100。
preferably, the smelting process specifically comprises the following steps:
putting the raw material obtained in the step A) into a vacuum electric arc furnace, and then vacuumizing to 4 × 10-3Charging argon gas at 0.05MPa below Pa, and continuously vacuumizing to 4 × 10-3Below Pa, filling argon of 0.2 MPa; and smelting for 5-7 times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high mass percentage and purity of 99.999 percent to obtain the master alloy ingot.
Preferably, the cooling rate of the rapid solidification cooling is 102～103K/s。
The application provides a catalyst represented by formula CoaWbBcThe cobalt-based bulk amorphous alloy has the advantages that due to a large number of covalent bonds formed between the metalloid atoms and the metal atoms, the cobalt-based bulk amorphous alloy has no defects such as dislocation, crystal boundary and the like, so that the cobalt-based bulk amorphous alloy has ultrahigh strength; meanwhile, the cobalt-based bulk amorphous alloy consists of three components of Co, W and B, the atomic radius difference ratio between the main components is more than 12%, and large negative mixing enthalpy is formed among the components, so that the cobalt-based bulk amorphous alloy has better amorphous forming capability; furthermore, the amorphous alloy contains a high-melting-point metal element W, so that the glass transition temperature and the initial crystallization temperature of the alloy system reach 960K and 1020K respectively, and the cobalt-based amorphous alloy contains a large number of metalloid covalent bonds due to the contained metalloid element B, so that the melting point of the alloy system is higher, and the amorphous alloy system has high thermal stability; the cobalt-based bulk amorphous alloy has no defects such as dislocation, grain boundary and the like in crystals, shows uniform corrosion characteristics in a corrosion medium, and simultaneously has the characteristics of uniform corrosionThe high content of W element leads the surface of the alloy to rapidly generate a layer of oxidation film during the corrosion process to be passivated, thus leading the corrosion current density of the alloy system alloy in 3.5 wt/% NaCl solution to be as low as 8 mu A/cm2Much lower than the corrosion current density of 1700 μ A/cm of 316 stainless steel in 3.5 wt/% NaCl solution2(Li C X, Bell T. Corrossion Science,2004,46:1527-2(Shabani-Nooshabadi M,Ghandchi M S.Journal of Industrial and EngineeringChemistry,2015,31:231-237.)。
Drawings
FIG. 1 shows Co prepared in example 1 of the present invention63W21B16An X-ray diffraction (XRD) pattern of the bulk amorphous alloy;
FIG. 2 shows Co prepared in example 1 of the present invention63W21B16A room temperature compressive stress strain curve of the bulk amorphous alloy;
FIG. 3 shows Co prepared in example 1 of the present invention63W21B16Differential Thermal Analysis (DTA) curve of bulk amorphous alloy;
FIG. 4 shows Co prepared in example 2 of the present invention59W26B15XRD pattern of the bulk amorphous alloy;
FIG. 5 shows Co prepared in example 2 of the present invention59W26B15DTA curve of bulk amorphous alloy.
FIG. 6 shows Co prepared in example 3 of the present invention56W28B16XRD pattern of the bulk amorphous alloy;
FIG. 7 shows Co prepared in example 3 of the present invention56W28B16Potentiodynamic polarization curve of bulk amorphous alloy in 3.5 wt% NaCl solution.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In view of the current situation of the cobalt-based bulk amorphous alloy at present, the application discloses a novel Co-based bulk amorphous alloy with low cost, ultrahigh strength, strong amorphous forming capability, high thermal stability, high corrosion resistance and few components. Specifically, the embodiment of the invention discloses a cobalt-based bulk amorphous alloy shown as a formula (I),
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝12～19；a+b+c＝100。
in the cobalt-based bulk amorphous alloy provided by the application, Co is taken as a matrix element, and the atomic percent of Co is 54-70, and in a specific embodiment, the atomic percent of Co is 55-65.
The W element in the cobalt-based bulk amorphous alloy is used as a high-melting-point element, so that the strength, the thermal stability and the corrosion resistance of the cobalt-based bulk amorphous alloy can be improved. The atomic percentage of W is 15-30; in a specific embodiment, the atomic percentage of W is 20 to 30.
The element B can improve the amorphous forming capability of the alloy system, and in addition, covalent bonds can be formed between the element B and metal elements, so that the strength and the thermal stability of the cobalt-based amorphous alloy are further improved. The atomic percentage of B is 12-19; in a specific embodiment, the atomic percentage of B is 15-18.
In a specific embodiment, a cobalt-based bulk amorphous alloy is provided, as shown in formula Co63W21B16。
In an embodiment, the cobalt-based bulk amorphous alloy is represented by formula Co59W26B15。
In an embodiment, the cobalt-based bulk amorphous alloy is represented by formula Co56W28B16。
The elements in the cobalt-based bulk amorphous alloy do not play a role independently, and W, Co and B are matched with each other, so that the cobalt-based bulk amorphous alloy has ultrahigh strength, good amorphous forming capability, high thermal stability, good corrosion resistance and good soft magnetic performance; specifically, the method comprises the following steps:
the cobalt-based amorphous alloy provided by the application has ultrahigh Young modulus (reaching 272GPa), reflects strong interatomic bonding force of alloy components, and is due to the fact that a large number of covalent bonds are formed between metal atoms and metal atoms; meanwhile, the Co-based amorphous alloy has no defects such as dislocation, grain boundary and the like, thereby showing ultrahigh strength.
Co provided by the present applicationaWbBcThe amorphous alloy consists of three components, the atomic radius difference ratio between the main components is more than 12 percent, and the amorphous alloy has large negative mixing enthalpy; the element B as a metalloid element has great negative mixing enthalpy (Co-B is-24 kJ/mol, W-B is-31 kJ/mol) with a metal component, and meanwhile, the acting force between the element B and the metal atom is great, so that the supercooled liquid is more stable and is not easy to crystallize and crystallize, and thus, the element B has great amorphous forming capacity; metallic elements Co and W, forming metastable phases (Co, W) with B elements easily23B6The phase has a complex structure, so that the supercooled liquid is difficult to nucleate and grow up, and finally, the supercooled liquid is rapidly cooled to form the amorphous alloy. The critical diameter of the copper mold can reach 3mm by adopting a water-cooling copper mold technology, so that the copper mold has better amorphous forming capability.
The cobalt-based amorphous alloy provided by the application contains a metal element W with a high melting point, so that the glass transition temperature and the initial crystallization temperature of the alloy system reach 960K and 1020K respectively; meanwhile, the cobalt-based amorphous alloy contains a metalloid element B, so that the cobalt-based amorphous alloy contains a large number of metalloid covalent bonds, and the melting point of an alloy system is higher, therefore, the amorphous alloy system shows high thermal stability, which means that the amorphous alloy has a larger using temperature range and is not easy to crystallize.
The cobalt-based amorphous alloy provided by the application has no defects such as dislocation, grain boundary and the like in crystals, and has the characteristic of uniform corrosion in a corrosion medium; the high content of B element enables the alloy system to have a large number of covalent bonds, so that the alloy system has a stable structure, and meanwhile, the high content of W element enables the transportation rate of oxygen atoms to be accelerated in the sample corrosion process, and a layer of complex and compact oxide film is rapidly generated on the surface, so that the cobalt-based amorphous alloy has excellent corrosion resistance.
The cobalt-based amorphous alloy provided by the application has no defects such as dislocation, grain boundary and the like in crystals, so that the alloy is extremely easy to magnetize and has high magnetic conductivity, and particularly, the cobalt-based amorphous alloy still keeps high magnetic conductivity at medium-high frequency; in addition, the cobalt-based amorphous alloy can avoid the pinning effect of grain boundaries and the like on magnetic domains, thereby showing smaller coercive force and being superior to the conventional silicon steel crystalline alloy.
The application also provides a preparation method of the cobalt-based bulk amorphous alloy, which comprises the following steps:
A) proportioning according to atomic percent of each element of the cobalt-based bulk amorphous alloy shown in formula (I);
B) smelting the raw materials obtained in the step A) to obtain a master alloy ingot;
C) carrying out water-cooling copper mold suction casting and rapid solidification cooling on the master alloy ingot to obtain a cobalt-based bulk amorphous alloy;
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝12～19；a+b+c＝100。
in the process of preparing the cobalt-based bulk amorphous alloy, first, batching is performed, which is performed in a manner well known to those skilled in the art, and there is no particular limitation. In a specific embodiment, the purity of the raw materials of the three elements is higher than 99.9% by mass percent.
According to the invention, the proportioned raw materials are smelted to obtain a master alloy ingot; the smelting process specifically comprises the following steps:
putting the raw materials into a vacuum arc furnace, and vacuumizing to 4 × 10-3Charging argon gas at 0.05MPa below Pa, and continuously vacuumizing to 4 × 10-3Below Pa, filling argon of 0.2 MPa; and smelting for 5-7 times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high mass percentage and purity of 99.999 percent to obtain the master alloy ingot.
This application carries out water-cooling copper mould with the master alloy ingot who obtains at last and inhalesAnd casting, rapidly solidifying and cooling to obtain the cobalt-based bulk amorphous alloy. The cooling rate in the rapid solidification cooling is 102～103K/s。
The application designs a novel ultrahigh-strength ternary Co-based bulk amorphous alloy which has few alloy components and provides a simple model system for developing the ultrahigh-strength bulk amorphous alloy; the cobalt-based bulk amorphous alloy with ultrahigh strength, extremely high hardness, high thermal stability and strong amorphous forming capability can be used for preparing an amorphous alloy sample rod with the maximum critical diameter of 3mm by a rapid solidification technology, the breaking strength of the sample rod is 5.5 GPa-6.3 GPa, the glass transition temperature Tg of the sample rod is 844K-960K, the sample rod has extremely high thermal stability, and the corrosion current density of the sample rod in a 3.5% NaCl solution is as low as 8 muA/cm2The corrosion resistance is excellent; on the other hand, the bulk amorphous alloy of the invention adopts the melting process of a vacuum arc furnace, and then the bulk amorphous alloy sample rod is prepared by using the rapid condensation technology, and the preparation process is simple.
For further understanding of the present invention, the cobalt-based bulk amorphous alloy and the method for preparing the same according to the present invention will be described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
EXAMPLE 1 ternary Co63W21B16Preparation of bulk amorphous alloy
The method comprises the following steps: ingredients
According to CoaWbBcWeighing three raw materials of Co, W and B according to target components of the ternary block amorphous alloy, polishing surface oxide skin of the metal raw material, wherein the mass percentage purity of each raw material is higher than 99.9%; the CoaWbBcWherein, Co is metal cobalt Co, W is metal tungsten W, B is elementary boron B, a, B and c are atomic percentages, a is 63, B is 21, c is 16, and a + B + c is 100;
step two: smelting into alloy ingot in vacuum electric arc furnace and preparing Co63W21B16Bulk amorphous alloy
Putting the prepared raw materials into a vacuum electric arc furnace, and then vacuumizing to 4 × 10-3Below Pa, rechargingArgon gas of 0.05MPa, and continuously vacuumizing to 4 × 10-3Below Pa, filling argon of 0.2 MPa; smelting for five to seven times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high mass percentage and purity of 99.999 percent to ensure that the alloy components are uniform and obtain a master alloy ingot;
finally, the master alloy ingot is completely melted, and Co is obtained by water-cooling copper mold suction casting and rapid solidification cooling63W21B16A bulk amorphous alloy sample rod; cooling rate of 102～103K/s。
2mm diameter Co prepared in this example63W21B16After the analysis of X-ray diffraction (XRD) on the bulk amorphous alloy bar, as shown in figure 1, no obvious crystal peak can be seen in the XRD pattern, the crystal peak is represented as a typical diffuse scattering peak of an amorphous material, the corresponding size of the component in the XRD precision range is shown to be composed of a single amorphous phase, and further Co is shown to be contained63W21B16The critical diameter of the block amorphous alloy can reach 2 mm.
Ternary Co prepared in this example63W21B161mm bar of block amorphous alloy, the intercepting height-diameter ratio is 2: 1 samples were subjected to room temperature mechanical compression testing, Co of FIG. 263W21B16The room temperature compression engineering stress-strain curve diagram of the bulk amorphous alloy shows that the analysis of the compression mechanics experiment shows that Co63W21B16The fracture strength of the bulk amorphous alloy is 6000 MPa.
Ternary Co prepared in this example63W21B16The block amorphous alloy is tested for the elastic constant by an ultrasonic echo method, and the result shows that the Young modulus of the ternary block amorphous alloy is 272 GPa.
Ternary Co prepared in this example63W21B16A bar material with the diameter of 1mm of the block amorphous alloy is cut out, the length of the middle part of the bar material is 1mm, and a Differential Thermal Analyzer (DTA) is used for carrying out thermal analysis and test to obtain thermodynamic parameters. Co as in FIG. 363W21B16DTA curve of bulk amorphous alloy, the result shows that Co63W21B16Bulk amorphous alloyThe glass transition temperature Tg of gold is 885K.
Example 2Co59W26B15Preparation of bulk amorphous alloy
The method comprises the following steps: ingredients
According to CoaWbBcWeighing three raw materials of Co, W and B according to target components of the ternary block amorphous alloy, polishing surface oxide skin of the metal raw material, wherein the mass percentage purity of each raw material is higher than 99.9%; the CoaWbBcWherein, Co is metallic cobalt Co, W is metallic tungsten W, B is elementary boron B, a, B and c are atomic percentages, wherein, a is 59, B is 26, c is 15, and a + B + c is 100;
step two: smelting into alloy ingot and Co in vacuum arc furnace59W26B15The bulk amorphous alloy is prepared by putting the prepared raw materials into a vacuum arc furnace, and then vacuumizing to 4 × 10-3Charging argon gas at 0.05MPa below Pa, and continuously vacuumizing to 4 × 10- 3Below Pa, filling argon of 0.2 MPa; smelting for five to seven times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high mass percentage and purity of 99.999 percent to ensure that the alloy components are uniform and obtain a master alloy ingot;
finally, completely melting the master alloy ingot, carrying out suction casting by a water-cooling copper mould, and rapidly solidifying and cooling to obtain Co59W26B15A bulk amorphous alloy sample rod; cooling rate of 102～103K/s。
The 3mm diameter Co prepared in this example59W26B15Bulk amorphous alloy rods were analyzed by X-ray diffraction (XRD), Co as in FIG. 459W26B15As shown in the XRD spectrum of the bulk amorphous alloy, the alloy has no obvious crystal peak as can be seen from figure 4, and is represented as a typical diffuse scattering peak of an amorphous material, which shows that the corresponding size of the component in the XRD precision range is composed of a single amorphous phase, and further shows that Co is contained in the amorphous material59W26B15The critical diameter of the block amorphous alloy can reach 3 mm.
Ternary Co prepared in this example59W26B15The method comprises the steps of cutting a bar material with the diameter of 1mm and the length of the middle part of the bar material with the diameter of 1mm by 1mm, and carrying out thermal analysis test by using a Differential Thermal Analyzer (DTA) to obtain thermodynamic parameters. Co as in FIG. 559W26B15The DTA curve of the bulk amorphous alloy shows that the result shows that Co59W26B15The glass transition temperature of the bulk amorphous alloy is 882K, and the supercooled liquid region between the glass transition temperature Tg and the crystallization temperature Tx is 85K.
EXAMPLE 3 ternary Co56W28B16Preparation of bulk amorphous alloy
The method comprises the following steps: ingredients
According to CoaWbBcWeighing three raw materials of Co, W and B according to target components of the ternary block amorphous alloy, polishing surface oxide skin of the metal raw material, wherein the mass percentage purity of each raw material is higher than 99.9%; the CoaWbBcWherein, Co is metal cobalt Co, W is metal tungsten W, B is elementary boron B, a, B and c are atomic percentages, a is 56, B is 28, c is 16, and a + B + c is 100;
step two: smelting into alloy ingot in vacuum electric arc furnace and preparing Co56W28B16Bulk amorphous alloy
Putting the prepared raw materials into a vacuum electric arc furnace, and then vacuumizing to 4 × 10-3Charging argon gas at 0.05MPa below Pa, and continuously vacuumizing to 4 × 10-3Below Pa, filling argon of 0.2 MPa; smelting for five to seven times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high mass percentage and purity of 99.999 percent to ensure that the alloy components are uniform and obtain a master alloy ingot;
finally, the master alloy ingot is completely melted, and Co is obtained by water-cooling copper mold suction casting and rapid solidification cooling56W28B16A bulk amorphous alloy sample rod; cooling rate of 102～103K/s。
2mm diameter Co prepared in this example56W28B16The bulk amorphous alloy bar is analyzed by X-ray diffraction (XRD), as shown in figure 6, no obvious crystal peak can be seen from the XRD pattern, and the bar is represented as a non-crystal peakThe diffuse scattering peaks typical of crystalline materials indicate that the corresponding size of the component consists of a single amorphous phase within the XRD accuracy range, which in turn indicates that Co is present56W28B16The critical diameter of the block amorphous alloy can reach 2 mm.
Co prepared in this example56W28B16The bulk amorphous alloy rods were electrochemically tested in 3.5% NaCl solution, Co as shown in FIG. 756W28B16Bulk amorphous alloy potentiodynamic polarization curve, and analyzing to obtain Co56W28B16The corrosion current density of the block amorphous alloy in 3.5 percent NaCl solution is 8 mu A/cm2。
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A cobalt-based bulk amorphous alloy represented by formula (I),
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝15～18；a+b+c＝100。
2. the cobalt-based bulk amorphous alloy according to claim 1, wherein the atomic percent of Co is 55 to 65.
3. The cobalt-based bulk amorphous alloy according to claim 1, wherein the atomic percent of W is 20 to 30.
4. The co-based bulk amorphous alloy according to claim 1, wherein a is 63, b is 21, and c is 16.
5. The cobalt-based bulk amorphous alloy according to claim 1, wherein a-59, b-26, and c-15.
6. The cobalt-based bulk amorphous alloy according to claim 1, wherein a-56, b-28, and c-16.
7. The method for preparing a cobalt-based bulk amorphous alloy according to claim 1, comprising the steps of:
A) proportioning according to atomic percent of each element of the cobalt-based bulk amorphous alloy shown in formula (I);
B) smelting the raw materials obtained in the step A) to obtain a master alloy ingot;
C) carrying out water-cooling copper mold suction casting and rapid solidification cooling on the master alloy ingot to obtain a cobalt-based bulk amorphous alloy;
CoaWbBc(Ⅰ)；
wherein a, b and c are atomic percentages of the corresponding elements;
a＝54～70；b＝15～30；c＝15～18；a+b+c＝100。
8. the preparation method according to claim 7, wherein the smelting process is specifically as follows:
putting the raw material obtained in the step A) into a vacuum electric arc furnace, and then vacuumizing to 4 × 10-3Charging argon gas at 0.05MPa below Pa, and continuously vacuumizing to 4 × 10-3Below Pa, filling argon of 0.2 MPa; in mass percentAnd (3) smelting for 5-7 times at the smelting temperature of 1500-2500 ℃ under the protection of argon atmosphere with high purity of 99.999 percent to obtain a master alloy ingot.
9. The method of claim 7, wherein the rapid solidification cooling is performed at a cooling rate of 102～103K/s。
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| US4133682A (en) * | 1978-01-03 | 1979-01-09 | Allied Chemical Corporation | Cobalt-refractory metal-boron glassy alloys |
| CN104451467A (en) * | 2014-12-15 | 2015-03-25 | 郑州大学 | Cobalt-based block amorphous alloy and preparation method thereof |
| CN108504966A (en) * | 2018-06-11 | 2018-09-07 | 西南大学 | A kind of cobalt-base body amorphous alloy and preparation method thereof |
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| US4133682A (en) * | 1978-01-03 | 1979-01-09 | Allied Chemical Corporation | Cobalt-refractory metal-boron glassy alloys |
| CN104451467A (en) * | 2014-12-15 | 2015-03-25 | 郑州大学 | Cobalt-based block amorphous alloy and preparation method thereof |
| CN108504966A (en) * | 2018-06-11 | 2018-09-07 | 西南大学 | A kind of cobalt-base body amorphous alloy and preparation method thereof |
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