JP2004536221A - Geometrically clearly expressed amorphous metal alloys, methods for their production and articles formed therefrom - Google Patents

Abstract

The present invention relates to geometrically defined amorphous metal alloy articles and methods for their manufacture.

Description

[Background Art]
[0001]
Background of the Invention
The present invention relates to an amorphous metal alloy having a well-defined three-dimensional ("3-D") geometric structure therein, and a method for producing the same.
[0002]
Amorphous metal alloys (often referred to as "amorphous metal alloys", "glassy metals" or "metallic glasses") typically lack any substantial long-range atomic order. These amorphous metal alloys are characterized by X-ray diffraction patterns consisting of diffuse (broad) intensity maxima qualitatively similar to those observed in liquid or inorganic oxide glasses. However, when heated to a sufficiently high temperature, they begin to crystallize with the release of the heat of crystallization; correspondingly, the X-ray diffraction patterns show, by their crystallization, what is observed in amorphous materials. Begins to change from that observed in crystalline materials. Therefore, the amorphous metal alloy is in a metastable state. This particular metastable amorphous state of an amorphous metal alloy gives the alloy unique mechanical and physical properties.
[0003]
Amorphous metal alloys generally have physical properties, such as hardness and strength, that exceed those of their crystalline counterparts. Amorphous metal alloys, unlike crystalline alloys, do not have long-range order in their atomic structure, so the orientation of physical and magnetic properties usually associated with the periodic (crystalline) atomic structure of the crystal Does not exist. Also, unlike ordinary alloys, amorphous metal alloys are extremely homogeneous, free of compositional inhomogeneities, inclusions and various other microstructural defects, and are likely to have potential stress concentration areas. Less exposure to the harmful effects of
[0004]
Amorphous metal alloys can be manufactured by various techniques. Electroplating, evaporation and sputtering are all methods by which materials are deposited on an atomic apposition basis. Under appropriate conditions, atoms are “frozen” in situ when they come into contact with the substrate surface, but they diffuse into lower-energy atomic configurations that are usually associated with a stable periodic crystal lattice configuration It is not possible. The resulting metastable structure can be an amorphous (glassy) structure. However, producing amorphous metal alloys in large commercial quantities with such process methods is not economically feasible.
[0005]
Another method of producing amorphous metal alloys is by rapid cooling from the melt. In achieving a glassy structure in this manner, two main conditions apply. First, the composition chosen has a high glass transition temperature T_g, And low melting temperature T_mShould have. The glass transition temperature is the temperature above which substantial atomic motion begins to occur. The melting temperature is the temperature above which there is complete liquefaction of the substance. More specifically, T_g/ T_mThe ratio should be as large as possible. Second, the liquid is T_mT from higher temperature_gIt should be cooled as quickly as possible to a lower temperature. In practice, it has generally been found that the cooling rate of the melt quench process must be high enough to avoid crystallization that would otherwise occur (about one million degrees per second). Even at the high cooling rates typically used, only alloys with a certain composition can be melt quenched into amorphous metal alloys. One class of such amorphous metal alloys is the "glass" as an essential alloying additive atom, usually in the range of 10-25 atomic percent, in combination with late transition metal elements such as iron, nickel, cobalt and chromium. Consisting of "formable" non-metallic atoms, such as phosphorus, boron, silicon and carbon. Another class of metallic glasses consists of a mixture of early and late transition metals.
[0006]
Amorphous metal alloys, when subjected to sufficiently high mechanical stress, have a glass transition temperature T_gAt much lower temperatures, they undergo heterogeneous plastic deformation due to the formation of highly localized shear bonds. This type of heterogeneous plastic deformation is similar to that of ordinary crystalline alloys. At such low temperatures, amorphous metal alloys exhibit high strength and high modulus and exhibit a breaking stress that is only marginally greater than the yield stress. This results in only a small amount of stretching under tension before failure. In contrast, T_gThe mode of plastic deformation at temperatures near or above is that macroscopic distortion in the specimen results from homogeneous deformation due to viscous-like flow through the entire sample volume.
[0007]
Discussion of the deformation behavior of amorphous metal alloys as a function of temperature is not infrequent, but is described in the technical literature, for example, in JP-A-53-57170 published May 24, 1978 to Masumoto. Seen in In this patent publication, Masumoto describes a temperature situation where high "secondary processing characteristics" occur. Masumoto also states that secondary forming methods such as rolling, stamping, pressing, pultrusion and bending can be performed in that temperature regime. Patterson et al., In Rapidly Quenched Metals III, Vol. 2 (1978), describe the thermoforming ability of amorphous metal alloy ribbons to cap-like shapes when deformed at elevated temperatures. The authors teach the recognition of a trade-off between thermoforming temperature and time and the danger of amorphous metal alloy crystallization when the process temperature is too high.
[0008]
Summary of the Invention
In one aspect of the present invention, there is provided an amorphous metal alloy article having a well-defined, well-defined topographic structure.
[0009]
In another aspect of the present invention, there is provided a method of making an amorphous metal alloy article having a well-defined, well-defined topographic structure.
In a still further aspect of the invention, there is provided an abrasive article formed utilizing an amorphous metal alloy article having a well-defined, well-defined topographical structure.
[0010]
In yet a further aspect of the present invention, there is provided a method of making an abrasive article formed from an amorphous metal alloy article having a well-defined, well-defined topographic structure.
In a further aspect of the present invention, there is provided a shaving article formed utilizing an amorphous metal alloy article having a well-defined, well-defined topographic structure, and methods of making the same.
[0011]
In another aspect of the present invention, there is provided a self-fitting amorphous metal alloy article having a well-defined, well-defined topographic structure.
In a still further aspect of the present invention, there is provided a method of making a self-fitting amorphous metal alloy article having a well-defined, well-defined terrain structure.
[0012]
These and other aspects of the invention will become more apparent from the following detailed description of the invention.
Detailed description and description of preferred embodiments
The present invention provides novel amorphous metal alloy articles having a well-defined, well-defined topographical structure, and methods of making them. Such well-defined, well-defined terrain features introduce a permanent deformation into the generally planar ("two-dimensional") amorphous metal foil or ribbon into the collective noun Geometric patterns, textures, profiles or other features, referred to in the art as "articulated topographical definitions" Created by applying a selected force to produce a non-planar ("three-dimensional") amorphous metal foil or ribbon. Such a clearly expressed, well-defined With respect to terrain features, permanent deformations are introduced that distort or expand the generally planar amorphous metal foil or ribbon, as typically applied to "as cast" molded parts, thus creating a permanent non-planar three-dimensional profile. Giving This can be compared to the jaggedness: at a minimum, only one well-defined, well-defined terrain structure can be provided. It is more advantageous to provide a plurality of geometrically repeating, well-defined, well-defined terrain structures. Such geometrically repeating, well-defined The well-defined terrain structure can be of any shape and arrangement that provides a well-defined, regularly repeating pattern of well-defined terrain structures, and ideally Provides an interlock between the individual patterns, for example, pyramids, squares, circles and hexagons can all be used without restriction. To be able to fill , In particular hexagonal, pyramid shape, square shape, rectangular shape, triangular shape etc. can therefore can result in maximum peak amount per unit surface area of the article should generally preferred.
[0013]
Successful implementation of the present invention relies on taking advantage of the stress relaxation properties of amorphous metal alloys. Stress relaxation in amorphous metal alloys means that the "free volume", which disappears during formation, indicates that the test piece is geometrically distinct, including changes in shape, e.g., patterns, structures, or other well-defined structures. It is closely linked to the atomic structure relaxation that gradually disappears while undergoing the emergence of the clearly defined structure. The greater the free volume content of the amorphous metal alloy, the greater its ability to acquire well-defined geometry during processing. Figure 1 shows the nominal composition Fe₈₀B₁₁Si₉4 shows the time-temperature dependence of stress relaxation of an amorphous metal alloy having the following.
[0014]
Any amorphous metal alloy composition that can have at least one but preferably a plurality of well-defined, well-defined topographic features can be implemented and It should be understood that this is considered to be within the scope of the teachings. As a non-limiting example, compositions of amorphous metal alloys that can be subjected to the method according to the present invention optionally, but in some cases desirably, are small, ie, 0.1 to 15 atomic percent, preferably 0.1 to 10 atomic percent. Some are mainly composed of 5 to 6 atomic percent of Fe, Ni, Cr, Co and V to which certain elements such as Al, Si, Sn, Sb, Ge, In or Be are added. Addition of the former elements in the discussed amounts often improves the glass forming properties of amorphous metal alloys; that is, the amorphous state is more readily obtained and is often more thermally stable. A particularly useful amorphous metal alloy has the formula:
M_kY_p
(Where
M is a metal selected from one or more of the group consisting of Fe, Ni, Co, V and Cr;
Y represents one or more elements from the group consisting of P, B and C;
k represents atomic percent and has a value of about 70-85;
p represents atomic percent and has a value of about 15-30. )
And the formula:
M_aY_bZ_c
(Where
M and Y are as defined above;
Z is one or more elements selected from the group Al, Si, Sn, Ge, In, Sb or Be;
a represents atomic percent and has a value of about 60-90;
b represents atomic percent and has a value of about 10-30;
c represents atomic percent and has a value of about 0.1-15;
And a + b + c = 100. )
Which can be represented by any of However, since these compositions are believed to be able to enjoy the benefits of the present invention, virtually all compositions of amorphous metal alloys that can be successfully formed by the inventive method taught in the present invention are considered to be these representatives. It should be understood that typical amorphous metal alloy compositions are given by way of example and not by way of limitation.
[0015]
Referring to FIGS. 2a and 2b, they include a strip or tape (20) of amorphous metal foil having a plurality of geometrically repeating, well-defined, well-defined terrain structures (24). In this case, each of the well-defined, well-defined, well-defined terrain features has a hexagonal base (26), which is each well-defined, well-defined, It tapers to a plateau (28) at the peak of the distinct terrain structure (24). As the overview of this figure reveals, dense packing of individual, well-defined, well-defined terrain features is possible due to the interlocking nature of the base of each terrain structure. As can be seen, the hexagonal shape of these bases results in such close packing.
[0016]
Referring to FIGS. 2a and 2b, it is clear that each of the well-defined, well-defined terrain structures according to the invention also have geometric dimensions to be considered. It should also be understood. For example, each well-defined, well-defined terrain feature has a base dimension, which includes a base region (21) in the plane of an amorphous metal foil strip or tape (20). Of course, if the maximum number of well-defined, well-defined terrain structures is to be introduced into one amorphous metal ribbon, then a single, well-defined, well-defined terrain It should be understood that the size of each of the structures and their base region must be small. The converse is also true. For example, with respect to the generally hexagonal, well-defined, well-defined terrain features shown in FIGS. 2a and 2b, three per row, generally hexagonal, well-defined, contours There is a clear terrain structure. This is depicted in FIG. 2 with reference lines "a" and "b"; the reference lines "a" and "b" are each clearly represented by their three, generally hexagonal, shapes. , Three well-defined topographic structures, ie, three on the reference line “a” (a ′, a ″, a ′ ″) and three on the reference line “b” (b ′, b ″, b '' '). By providing a generally hexagonal, well-defined, well-defined terrain structure with smaller individual basal regions, a well-defined, well-defined, amorphous metal ribbon Closer filling of the terrain structure could be easily introduced. Clearly defined, well-defined terrain structures of different shapes and arrangements may also be used, and such well-defined, well-defined terrain structures may have adjacent bases in FIG. 2a. It is also contemplated that it is not necessary to have the generally hexagonal, well-defined, well-defined terrain layout shown.
[0017]
Figures 3a and 3b show a series of individual, well-defined, individual, distinct, well-defined, well-defined terrain structures that are not densely packed. FIG. 3 illustrates another embodiment of an amorphous metal alloy ribbon (30) having a well-defined terrain structure (34) introduced therein. As can be seen from FIG. 3a, each of these individual, well-defined, well-defined terrain structures (34) are randomly arranged in the depicted amorphous metal alloy strip, and furthermore These, clearly expressed, well-defined terrain structures have different sizes. That is, each of the clearly-expressed, well-defined terrain structures depicted is assumed to have an equilateral triangle at its base and to extend to the point (38) (outward of the paper; Undrawn arrangements of these well-defined, well-defined terrain structures, as well as their different dimensions, are tapered to It illustrates the idea that various arrangements of the terrain structure can be used and still enjoy the benefits of the present invention. More specifically, FIG. 3 also illustrates a well-defined, well-defined terrain structure having different relative dimensions, including different geometries and / or different heights, in accordance with the principles of the present invention. It also illustrates the idea that it can be given to a single amorphous metal alloy foil.
[0018]
It should be understood that throughout the description of the various aspects of the present invention, the geometry described with reference to each of the figures is intended as an example, and not as a limitation. These well-defined, well-defined terrain structures can be of any form, including polygonal or irregular polygonal forms. Thus, different, clearly articulated, well-defined terrain structures, other than those described with reference to the particular illustrative figures, may be used as the particular, clearly defined, discussed or depicted in the present invention. It should be understood that the exposed, well-defined terrain structure can be used instead.
[0019]
A well-defined, well-defined topographical structure is conveniently provided to amorphous metal alloys by using mechanical means such as roller dies or stamping dies. What is referred to as a roller die is generally two rollers having a series of mating configurations on the surface, the mating configuration being an amorphous metal alloy strip or foil passing between the nips of these roller dies. It is intended to mean such a roller that seeks to provide a series of well-defined, well-defined terrain structures to a natural object. Similarly, a stamping die refers to a pair of dies having mating surfaces, the surfaces of which are unambiguously expressed on the material placed between the two dies, particularly the amorphous metal foil or strip described in the present invention. It is intended to provide a well-defined topographical structure. Both aspects of the dies, either roller dies or stamping dies, can be used to compress amorphous metal alloys for strips, where the compression creates permanent deformation into a planar two-dimensional foil or strip. This is performed for the purpose of giving a non-planar three-dimensional outer shape.
[0020]
With respect to operating conditions appropriate for the purpose of providing such a permanent, well-defined, well-defined terrain structure, the specific conditions include not only the chemical properties of the amorphous metal alloy being treated, but also its properties. Depends to a large extent on thickness. Ideally, the selection of an appropriate deformation temperature should be based on the idea of minimizing or eliminating crystallization during the stamping step, and ideally, this stamping step It is believed that the idea should be based on minimizing or eliminating embrittlement of the amorphous metal foil therein. These specific conditions can themselves be determined by routine testing steps that can be performed by those skilled in the art, but specific embodiments based on specific amorphous metal alloys are described in further detail below. . Those skilled in the art will be able to determine appropriate stamping conditions without undue experimentation, based on the particular embodiment.
[0021]
The invention can be implemented in a number of variants. The most direct method is to heat and heat the amorphous metal alloy foil or strip to an elevated temperature, and then stamp the amorphous metal alloy foil or strip using a suitable die, or otherwise. If it is a method of deforming. Alternatively, the amorphous metal alloy foil or strip may be provided to a preheated die at a sufficiently elevated temperature such that the amorphous metal alloy body is rapidly heated to an appropriate temperature during the stamping process. . In a still further variation, both the amorphous metal alloy foil or strip and the stamping die (s) are heated to an elevated temperature before or during the stamping process.
[0022]
With respect to the temperature at which the stamping process occurs, Applicants have noted that higher temperatures typically result in shorter residence times in the die, or alternatively lower pressure requirements in the die. Found that it is not particularly desirable where there is a significant risk of crystallization and / or embrittlement of the amorphous metal alloy foil or strip. Conversely, it would be advantageous to increase the residence time of the metal alloy foil or strip in the die, while reducing the temperature of the stamping operation to minimize the risk or degree of crystallization. Such an extended residence time also addresses temperature diffusivity limitations and ensures that the temperature is substantially uniform throughout the thickness of the amorphous metal alloy foil or strip.
[0023]
The present invention also provides an abrasive article formed from an amorphous metal alloy article having a well-defined, well-defined topographic structure, and a method of making the abrasive article. In accordance with this aspect, a well-defined, well-defined topographical structure is provided to the previously described amorphous metal alloys or strips, which are then further treated to impart abrasive properties thereto. It is processed.
[0024]
In one aspect, a significant number of polishing media, such as organic oxides or carbides, may be provided on at least one surface, preferably in well-defined, well-defined, well-defined topographical features in the alloy or strip. Given to the area. In this way, amorphous metal alloys or strips, which are known to be particularly hard, are very useful substrates to which the abrasive is applied. In another alternative, the amorphous metal alloy or strip is provided with a well-defined, well-defined topographical structure following the amorphous metal alloy portion or strip portion of the amorphous metal alloy or strip, particularly after the amorphous metal alloy or strip has been provided with a well-defined topography. The part of the well-defined, well-defined topographic structure near or near the peak of the well-defined topographic structure is partially crystallized. Such selective crystallization is expected to cause precipitation of a very hard intermetallic phase in the composition of the amorphous metal alloy. Such a hard intermetallic phase is very effective as a polishing medium, and is also very effective in providing cutting edges to articles formed from amorphous metal alloys. This selective crystallization can occur by any of a number of methods, but according to one particular method, a tight-focused beam is clearly expressed at or above the peak of a well-defined topographic structure. It is contemplated that lasers that can be directed to the region of the peak can be used to achieve such selective crystallization. Alternatively, or with selective crystallization at the tip of the well-defined, well-defined structure in the amorphous metal alloys of the present invention, hard abrasive particles can be added to the well-defined amorphous metal alloy article. It can be glued or otherwise bonded to the metal alloy article. Such bonding or bonding can be achieved, for example, by bonding, plasma spraying, impact welding, as well as other techniques known in the art but not described herein. Although not described in the present invention, other methods believed to be useful in achieving such selective crystallization are also useful and are considered to be within the scope of the present invention.
[0025]
In a still further aspect, an abrasive article according to the present invention provides cutting edges in a well-defined, well-defined terrain structure of an amorphous metal alloy strip produced by the method generally described above. Manufactured by According to this further aspect, the parts of the well-defined, well-defined terrain, especially the peaks of the well-defined, well-defined terrain, are removed following their formation. These are literally "lopped off", exposing sharp cutting edges of individual, well-defined, well-defined terrain structures. Such machining can be performed, for example, by grinding a well-defined, well-defined terrain feature, or by some other mechanical operation, as well as by a non-mechanical operation. It is only necessary to provide a cutting edge in a part of the well-defined part of the amorphous metal alloy. In conventional grinding operations, sharpening of the individual cutting edges with well-defined, well-defined terrain features is also achieved at the same time, which is therefore a preferred method of manufacture. Such an embodiment comprises a cutting article according to the invention comprising an amorphous metal alloy strip (40) having a plurality of frusto-conical, well-defined, well-defined terrain structures extending outwardly from a top surface. Is depicted in FIG. The cutting edge (48) of each of these well-defined, well-defined topographic frustoconical structures (44) has a well-defined, well-defined, well-defined topographical structure having a conical shape. Are formed by grinding such peaks to remove them, resulting in these well-defined, well-defined topographic frustoconical structures (44). According to this particular aspect, such a cutting article offers several unexpected and significant advantages over other cutting devices commonly known in the art. The high hardness of the amorphous metal alloys is expected to result in longer durable sharp cutting edges, giving longer service life to the cutting articles made therefrom. Furthermore, if a well-defined, well-defined terrain structure has a "cut" peak as in a grinding operation, the resulting cutting edge is non-directional; i.e., (a straight knife blade). Unlike a cutting article with a straight blade (as such), cutting occurs in any direction of movement of the cutting article described in accordance with the present invention. Thus, since the cutting tool has sharp cutting edges in any direction, there is no worry about directing the cutting direction to the workpiece.
[0026]
Geometry with round, spherical, grooved, square or rectangular geometry features and irregular geometry features, and any combination of these features that can be formed It is to be understood that other configurations, including specifically expressed amorphous metal alloys, are also considered to fall within the scope of such a cut article according to the present invention. The contour of the cutting edge formed from a geometrically defined amorphous metal alloy is also easily adjustable. The cutting edge can be straight, beveled, or shaped.
[0027]
It is contemplated that other techniques than those discussed above, particularly those that do not utilize a grinding process, may also be used in the manufacture of such cutting tools. Such technologies include, but are not limited to, electrochemical machining (ECM), electrical discharge machining (EDM), electrolytic machining, laser machining (LBM), electron beam machining (EBM), photochemical machining (PCM) or ultra Some are formed by one or more of the known methods of sonic machining (USM). Performing standard methods in the art, such as coating with a supplemental metal or non-metal, and coating with polytetrafluoroethylene (Teflon) or other lubricious material, followed by heat treatment Can be. The EDM method involves the use of an EDM tool fed into the area to be cut. The area to be cut is filled with a dielectric fluid, and between the EDM tool and the well-defined amorphous metal alloy, a rapid process is performed to remove the conductive material and consequently create an opening. A repetitive spark discharge is provided. A number of tools can be used to create a number of desired openings. The EDM method is particularly useful in situations where cutting is irregular, and it has the ability to make up to about 200 holes simultaneously. In the ECM method, a clearly-expressed amorphous metal alloy is cut by anodic dissolution in an electrolyte flowing quickly between steel and a shaped electrode. As with EDM, ECM can also be used to make multiple openings simultaneously, and it has the ability to make up to about 100 holes simultaneously.
[0028]
In addition, amorphous metal cutting articles are also ideally non-solid but support frame structures (e.g., grid frames, peripheral frames or edge frames, etc.) that are harder than the well-defined amorphous metal alloy itself. It is also conceivable to attach a material giving the following on a suitable substrate. Ideally, when used, any material that is removed during the cutting operation will fall through each of the individual, well-defined, well-defined terrain structures, but the material Can be easily removed from the surface or object being cut. This is important because the cutting articles made in accordance with the present invention are non-clogging but reliable, thus further extending the useful useful life of the cutting article. By way of non-limiting example, the cutting device includes a razor for use in personal care products, ie, a shaving razor. In addition, the cutting equipment is equipped with a planer, rasp, grain rasp, Surform® type tool, sanding and polishing tool, and a strip of geometrically defined amorphous metal alloy on the outer surface of the grinding wheel. There are other tools, such as grinding wheels, as well as other tools not specifically described herein.
[0029]
The structure and design of the cutting edge openings in such cutting articles is essentially unlimited when using non-traditional machining techniques. It is possible to form and control geometric features such as circular, spherical, grooved, square or rectangular, and irregular features, and any combination of these features. . The contour of the cutting edge can also be easily adjusted. The cutting edge may be straight, beveled, or shaped. Both vertical and horizontal structures require a number of sub-operations and, in contrast to traditional grinding techniques, which still cannot create these external features, electrochemical machining, electrical discharge machining, electrolytic machining, laser machining, electron beam It is easily formed in a single step using machining, photochemical machining, ultrasonic machining, and other alternative machining techniques. Known grinding techniques include those discussed in U.S. Patent No. 5,604,983 to Simms et al. And U.S. Patent Nos. 5,490,329 and 4,483,068 to Chylinski. Various technologies are available, including technology. Particularly useful and preferred effective techniques include sharp blades, including the method described in U.S. Pat. No. 5,983,756 to Orloff, the contents of which are incorporated herein by reference. Some do not require a grinding operation to make.
[0030]
In another aspect of the present invention, there is provided a self-fitting article formed from an amorphous metal alloy article having a well-defined, well-defined topographical feature.
A particularly advantageous feature achieved by the introduction of these well-defined, well-defined terrain features to amorphous metal alloy foils or tapes is that this introduction makes the stacking of multiple foils or strips oriented. That is to make it easier. This is particularly useful in the fabrication of any of a variety of devices that require a deposited layer or stack of amorphous metal alloy. For example, in the assembly of transformers where a large number, typically more than a few hundred, amorphous metal alloy foils are required to produce a spherical core, the actual required for the production of this core is Problems frequently occurred in the handling process. The smooth, slippery surface of the amorphous metal alloy foil typically has a frame, jig, or (epoxy-based adhesive) to maintain the desired geometrical arrangement of these layers of the amorphous metal alloy foil or strip. Requires the use of other holding means (including agents). However, utilizing well-defined, well-defined terrain features introduced into the foil or strip removes most of these technical issues associated with fabrication. This is due to the fact that when regularly repeating patterns are introduced, they provide a fit between the various layers. This fit provides physical retention and interlock between the individual layers, eliminating or reducing the need for any retention means, especially chemical retention means such as adhesives, epoxy resins, and the like. Such interlocking between successive layers also provides a means to increase the degree of rigidity of the elaborately assembled structure or assembly.
[0031]
Although described above with reference to wound cores such as those used in transformers, the beneficial features of stacked, interlocking amorphous metal alloy foils or strips are the stacked cores also known in the transformer art. It can be used in
[0032]
The advantages of the invention described herein may be enjoyed in a wide variety of other applications, which are not necessarily described herein.
【Example】
[0033]
Example 1
The input material for development according to the present invention is Ni₆₈Cr₇Fe_ThreeB₁₄Si₈Manufactured by planar flow casting of amorphous metal alloy ribbons. One casting was used to make a ribbon having a thickness of 40 μm, while the other casting was used to make a 90 μm thick ribbon. An oven allowing high temperature testing / running was equipped with an Instron® tensile tester. Both load and temperature were computer controlled according to programmed instructions. Making a male / female axial load die assembly and using it to make a well-defined pyramid impression in each ribbon-type specimen using various process parameters Made an attempt.
[0034]
Ni₆₈Cr₇Fe_ThreeB₁₄Si₈The crystallization temperature of the amorphous metal alloy is 470 ° C. as measured by differential scanning calorimetry. A process temperature of 325-500 ° C was investigated. Process loads ranged from 2.22 to 6.67 kN, while process times varied between 15 and 60 seconds. It has been found that process temperature is the single most important variable with respect to enabling 3-D geometric profile features anyway. The power of the process was the second important variable, primarily serving to define the details of the 3-D geometric feature articulation. Process time is not a significant variable in the range of process variables used.
[0035]
Onset of clear manifestation of 3-D geometric features occurs at higher temperatures / forces / time with thicker ribbons than with thinner ribbons. For example, this onset occurs when the thickness of the 40 μm ribbon exceeds 400 ° C., 3.56 kN, 15 seconds, as compared to a 90 μm thickness ribbon that must exceed 400 ° C., 6.67 kN, 15 seconds. Got up. When processed at 500 ° C., significant brittleness and warpage of the ribbon was observed, even though the 3-D geometric topographic features were very well defined.
[0036]
Example 2
Ni 15cm long and 40μm thick₆₈Cr₇Fe_ThreeB₁₄Si₈The amorphous metal alloy strip was compressed with a die placed in an oven at 325 ° C. using a force of 1.78 kN for 30 seconds. The resulting 3-D geometric pattern had indistinct outlines and was barely visible in practice.
[0037]
Example 3
Ni 15cm long and 40μm thick₆₈Cr₇Fe_ThreeB₁₄Si₈The amorphous metal alloy strip was compressed with a die placed in a 400 ° C. oven using a force of 3.56 kN for 60 seconds. The resulting 3-D geometric pattern showed very well and clearly every detail of the die.
[0038]
Example 4
Ni 15cm in length and 90μm in thickness₆₈Cr₇Fe_ThreeB₁₄Si₈The amorphous metal alloy strip was compressed with a die placed in a 375 ° C. oven using a force of 3.56 kN for 60 seconds. The resulting 3-D geometric pattern was not well defined.
[0039]
Example 5
Ni 15cm in length and 90μm in thickness₆₈Cr₇Fe_ThreeB₁₄Si₈The amorphous metal alloy strip was compressed with a die placed in a 425 ° C. oven using a force of 6.67 kN for 15 seconds. The resulting 3-D geometric pattern showed very well and clearly every detail of the die.
[0040]
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and may herein be shown by way of example. On the contrary, the intention is not to limit, but to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as expressed in the appended claims. It should be understood that.
[Brief description of the drawings]
[0041]
FIG. 1 Fe₈₀B₁₁Si₉5 is a graph showing time-temperature dependence of complete stress relaxation in an amorphous metal alloy.
FIG. 2a is a top view of an amorphous metal alloy strip having a geometrically repeating, well-defined, well-defined terrain structure.
2b is a side view of the amorphous metal alloy strip according to FIG. 2a.
FIG. 3a is a depiction of a further amorphous metal alloy strip having a second, non-geometrically repeated, well-defined, well-defined terrain structure.
3b is a side view of the amorphous metal alloy strip according to FIG. 3a.
FIG. 4 is a depiction of an embodiment of a cutting article made from an amorphous metal alloy strip having a geometrically repeating, well-defined, well-defined terrain structure.

Claims (19)

An amorphous metal alloy article having a well-defined, well-defined topographic structure. The amorphous metal alloy article of claim 1, comprising a plurality of well-defined, well-defined terrain structures. The amorphous metal alloy article of claim 1, comprising a plurality of geometrically repeating, well-defined, well-defined terrain structures. The amorphous metal alloy has the formula:
M _k Y _p
(Where
M is a metal selected from one or more of the group consisting of Fe, Ni, Co, V and Cr;
Y represents one or more elements from the group consisting of P, B and C;
k represents atomic percent and has a value of about 70-85;
p represents atomic percent and has a value of about 15-30. )
An amorphous metal alloy article having a well-defined, well-defined topographic structure having a composition that can be represented by: The amorphous metal alloy has the formula:
M _a Y _b Z _c
(Where
M is a metal selected from one or more of the group consisting of Fe, Ni, Co, V and Cr;
Y represents one or more elements from the group consisting of P, B and C;
Z is one or more elements selected from the group Al, Si, Sn, Ge, In, Sb or Be;
a represents atomic percent and has a value of about 60-90;
b represents atomic percent and has a value of about 10-30;
c represents atomic percent and has a value of about 0.1-15;
And a + b + c = 100. )
An amorphous metal alloy article having a well-defined, well-defined topographic structure having a composition that can be represented by: An abrasive article comprising an amorphous metal alloy article having a well-defined, well-defined topographic structure according to claim 1. An abrasive article comprising a plurality of amorphous metal alloy articles having a plurality of well-defined, well-defined terrain structures according to claim 2. A cutting article comprising the well-defined amorphous metal alloy article of claim 1 having a well-defined topographic structure. A cutting article comprising a plurality of amorphous metal alloy articles having a plurality of well-defined, well-defined terrain structures according to claim 2. An amorphous metal alloy article according to claim 2 having a well-defined, well-defined topographical structure. An article comprising a plurality of self-fitting amorphous metal alloy articles. A winding core for a transformer according to claim 2. Stacked core of a transformer according to claim 2. A method for producing an amorphous metal alloy article having a well-defined, well-defined topographic structure, comprising:
A method as described above comprising heating the amorphous metal alloy article at an elevated temperature and subsequently stamping or otherwise deforming the heated amorphous metal alloy article. The method of claim 14, wherein the die is preheated. The method according to claim 14, wherein the die is a roller die or a stamping die. 15. The method of claim 14, wherein at least a portion of a well-defined, well-defined terrain structure is selectively crystallized. 15. The method of claim 14, wherein at least a portion of the well-defined, well-defined terrain feature is ground to remove a portion of the well-defined, well-defined terrain feature. 15. The method of claim 14, wherein the abrasive is adhered to at least a well-defined, well-defined terrain structure of the amorphous metal alloy article.

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