CN217237483U

CN217237483U - High-temperature compression clamp for small metal glass test

Info

Publication number: CN217237483U
Application number: CN202220874046.6U
Authority: CN
Inventors: 王学刚; 段启强; 张哲峰
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-19
Anticipated expiration: 2032-04-15

Abstract

The invention discloses a high-temperature compression clamp for a tiny metal glass test, and belongs to the technical field of metal material mechanical property tests. This high temperature compression anchor clamps includes superalloy base and SiC briquetting, wherein: a stud with external threads is arranged on one side end face of the high-temperature alloy base, a columnar groove is arranged on the other side end face of the high-temperature alloy base, and an annular outer edge extending inwards is arranged at a notch of the columnar groove; the SiC pressing block is embedded in the columnar groove, and the structure of the SiC pressing block is matched with the shape of the columnar groove; during the test, the metal glass sample is clamped between the two SiC pressing blocks of the upper clamp and the lower clamp. The clamp utilizes a mode of combining metal and SiC, not only solves the defect of insufficient high-temperature strength of metal, but also makes up the defect of difficult processing of SiC material, thereby ensuring the smooth high-temperature compression test of amorphous material and the accuracy of test data.

Description

High-temperature compression clamp for small metal glass test

Technical Field

The invention relates to the technical field of material mechanical property tests, in particular to a high-temperature compression clamp for a tiny metallic glass test.

Background

The metallic glass is an alloy formed by arranging internal atomic structures in an irregular and random way. As a rigid solid with a special structure, the metal glass has higher strength than that of common metal, the metal glass has very high hardness and toughness and very small size effect of strength, and the elasticity of the metal glass is better than that of the common metal. The metal glass is commonly used in iron-based, cobalt-based, iron-nickel-based, and iron-cobalt-nickel-based alloys. The metal glass is used as an ideal model material, and has important reference significance for researching the fracture mode, the fracture angle, the fracture model, the fracture criterion and the like of the material.

At the present stage, there are many researches on metal glass, researchers have made extensive researches on various metal glasses, and abundant research results are obtained, but due to the characteristics of high strength, low plasticity and small volume of the metal glass, the mechanical properties of the metal glass are mainly room temperature compression performance, the room temperature compression test is mainly carried out in a mode that a hard alloy with higher strength than the metal glass at room temperature is padded on a metal platen as a pressing block, but with the research on the metal glass, the researchers want to search the compression performance and the fracture mode of the metal glass at high temperature, especially the high temperature compression performance within the range of 600-900 ℃ is the key point of research, but the existing high temperature compression clamps are metal platens, the compression strength at room temperature is only 2GPa, the compression strength at high temperature is gradually reduced, especially the compression strength at the temperature of more than 900 ℃ is reduced to less than 1GPa, the compressive strength is far less than that of metal glass, and embedding of a metal glass sample into a metal pressure plate can occur in the high-temperature compression process, so that the test fails.

The mode that uses traditional carbide as the briquetting also does not pass in the high temperature compression, on the one hand because the limitation of metallic glass sample size, metallic glass sample size is only 1 ~ 2mm at times, leads to can't place carbide as the briquetting on the metallic glass sample under the high temperature and carries out compression test. On the other hand, the hard alloy is softened even at high temperature, and the softening phenomenon becomes more serious as the temperature is higher, and particularly the softening at 700 ℃ or more is more remarkable. The compressive strength at high temperatures is significantly lower than that of metallic glass, and test failures due to the embedding of the test specimen in the cemented carbide also occur at high temperature compression. Effective high-temperature compression tests cannot be carried out all the time, and further the research on the high-temperature compression tests of the metal glass is seriously hindered.

Disclosure of Invention

To the above-mentioned weak point that exists among the current test method, the utility model provides a small metallic glass is experimental with high temperature compression anchor clamps, the design of this set of anchor clamps is that the machinability that utilizes superalloy with possess higher toughness under the high temperature, the SiC material still can keep the principle of higher intensity under the high temperature, through using the mode that superalloy and SiC material combined use, a threaded connection who takes the recess is processed out with superalloy material, imbeds the SiC piece of certain thickness in the recess as the high temperature compression when with metallic glass's contact surface. This both preserves the machinability of the superalloy and exploits the high strength properties of SiC at high temperatures. The device can ensure the accuracy of the high-temperature compression test of the metal glass, reduce the test period of material research, and provide reliable test data for the subsequent design and theoretical research of the metal glass material.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a small metallic glass is experimental with high temperature compression anchor clamps comprises the same last anchor clamps of structure and lower anchor clamps, goes up anchor clamps and all includes superalloy base and SiC briquetting down with lower anchor clamps, wherein: a stud with external threads is arranged on one side end face of the high-temperature alloy base, a columnar groove is arranged on the other side end face of the high-temperature alloy base, and an annular outer edge extending inwards is arranged at a notch of the columnar groove; the SiC pressing block is embedded in the columnar groove, and the structure of the SiC pressing block is matched with the shape of the columnar groove; during the test, the metal glass sample is clamped between the two SiC pressing blocks of the upper clamp and the lower clamp.

The high-temperature compression clamp is matched with a testing machine for use, when a test is carried out, two ends of a metal glass sample respectively abut against SiC pressing blocks of an upper clamp and a lower clamp, and a stud of a high-temperature alloy base is fixed on the high-temperature clamp of the testing machine.

The size of the external thread on the stud is matched with the internal thread of the high-temperature clamp of the testing machine, and when the high-temperature alloy base is fixed, the thread end part of the stud is pressed against the high-temperature clamp of the testing machine, so that the high-temperature alloy base cannot rotate in the high-temperature compression process.

The high-temperature alloy base is made of a high-temperature alloy material, and the high-temperature alloy material is a nickel-based high-temperature alloy, an iron-based high-temperature alloy or a cobalt-based high-temperature alloy; the SiC pressing block is made of silicon carbide (SiC).

The thickness of the annular outer edge at the notch of the columnar groove is less than or equal to 0.8 mm.

The metallic glass sample is of a cylindrical structure.

During the test, both ends of the metallic glass sample were in contact with only the surface of the SiC compact.

The principle and the beneficial effects of the invention are as follows:

the invention provides a high-temperature compression clamp for a tiny metal glass test, which effectively solves the problem that the metal glass is embedded into a metal clamp to cause test failure in the high-temperature compression process because the traditional clamp is softened at high temperature. This both preserves the machinability of the superalloy and takes advantage of the high strength properties of SiC at high temperatures. The fixture device can ensure the accuracy of the high-temperature compression test of the metal glass, reduce the test period of material research, and provide reliable test data for the subsequent design and theoretical research of the metal glass material.

Drawings

FIG. 1 is a schematic view of a superalloy base of a high temperature compression clamp.

FIG. 2 is a schematic view of a SiC compact of the high temperature compression jig.

FIG. 3 is a sample diagram of a metallic glass.

FIG. 4 shows a high-temperature compression jig structure in embodiment 1; wherein the left figure is a high-temperature alloy base, and the right figure is a SiC pressing block.

In the figure: 1-a high temperature alloy base; 2-a stud; 3-a groove; 4-an annular outer rim; 5-SiC briquettes; 6-metallic glass test specimens.

Detailed Description

For further understanding of the present invention, the following description is provided in conjunction with examples, which are provided to further illustrate features and advantages of the present invention, and not to limit the claims.

The utility model provides a small metallic glass is high temperature compression anchor clamps for experiment, this anchor clamps are used for measuring compressive property and the fracture mechanism of metallic glass sample under the high temperature condition. The material used for the clamp is high-temperature alloy and SiC.

As shown in fig. 1-3, the fixture is divided into an upper fixture and a lower fixture which have the same structure, and the upper fixture and the lower fixture respectively comprise a high-temperature alloy base 1 and a SiC briquette 5. Wherein: the high-temperature alloy base is preferably of a cylindrical structure, a stud 2 with external threads is arranged on one circular surface of the high-temperature alloy base, the size of the external threads is matched with the internal threads of the high-temperature clamp of the INSTRON 8801 testing machine, the threaded end of the stud 2 on the high-temperature alloy base is pressed against the high-temperature clamp of the INSTRON 8801 testing machine during test assembly, and the high-temperature alloy base is guaranteed not to rotate in the high-temperature compression process. The cylindrical groove 3 is machined on the other circular surface of the high-temperature alloy base through wire cutting, the size of the groove is matched with the size of the SiC pressing block 5, the SiC pressing block 5 is guaranteed to be just embedded into the groove of the high-temperature alloy base and cannot fall off, the annular outer edge 4 extends inwards at the groove opening of the groove, the thickness of the annular outer edge 4 is not more than 0.8mm, so that the metal glass sample 6 is guaranteed to be stressed instead of the high-temperature alloy base in the high-temperature compression process, and finally, the test failure is caused. The SiC pressing block material embedded in the high-temperature alloy base and contacted with the metal glass is SiC, the SiC material has the characteristics of high strength, high temperature resistance, no deformation at high temperature and the like, and the high-temperature hardness value is higher than that of the metal glass, so that the clamp has enough hardness to resist the metal glass in the high-temperature compression process, and the smooth test is ensured.

When the jig is used, the material of the high-temperature alloy base is required to be FGH96 high-temperature alloy, and the material of the SiC briquette is required to be SiC material. The machining precision of the high-temperature alloy base meets the test requirement. The fixture cannot be used in corrosive environments.

Example 1:

the structure and the size of each part of the clamp of the embodiment are shown in fig. 4, wherein the SiC pressing block is in a regular hexagon sheet structure, and the thickness is 10.1 mm; the diameter of the metallic glass sample is 1mm, and the height thereof is 2 mm.

The clamp is used specifically as follows:

(1) metallic glass coupons were processed according to the test requirements and the coupon dimensions were measured (fig. 3).

(2) The high-temperature alloy base and the SiC pressing block are well designed and processed according to a drawing, and the high-temperature compression clamp is assembled according to requirements, so that the SiC pressing block cannot fall off from the groove of the high-temperature alloy base, and the thickness of the annular outer edge of the groove on the high-temperature alloy base is 0.8mm in the embodiment.

(3) The screw thread of the stud on the high-temperature alloy base is screwed into a high-temperature clamp matched with one end of an INSTRON 8801 testing machine, the end part of the screw thread of the high-temperature alloy base is pressed against the high-temperature clamp of the INSTRON 8801 testing machine, and the high-temperature alloy base is guaranteed not to rotate in the high-temperature compression process.

(4) And (4) repeating the previous step (3), installing another high-temperature alloy base at the other end of the testing machine, and placing the SiC pressing block into the groove of the high-temperature alloy base.

(5) And placing the metal glass sample with the measured size on the SiC pressing block in the groove of the high-temperature alloy base.

(6) And opening a cooling water system of the high-temperature furnace and closing the high-temperature furnace.

(7) Inputting heating parameters, and preserving the heat for 30min after the set temperature is reached.

(8) Setting test parameters and starting the test.

The utility model provides a small metallic glass is experimental with high temperature compression anchor clamps designs according to metallic glass characteristics small, that intensity is high under the high temperature, can satisfy the requirement of its high temperature compression test.

The fixture is designed with a new structure combining high-temperature alloy and SiC, the metal part of the high-temperature compression fixture connected with the testing machine adopts FGH96 high-temperature alloy, and the contact plane of the high-temperature compression fixture and the metal glass sample adopts SiC material. The pressing block material embedded in the high-temperature alloy base and contacted with the metal glass is SiC, the SiC material has the characteristics of high strength, high temperature resistance, no deformation at high temperature and the like, and the high-temperature hardness value is higher than that of the metal glass, so that the clamp has enough hardness to resist the metal glass in the high-temperature compression process, and the smooth test is ensured.

Claims

1. The utility model provides a small metallic glass is experimental with high temperature compression anchor clamps which characterized in that: this high temperature compression anchor clamps comprises last anchor clamps and lower anchor clamps that the structure is the same, goes up anchor clamps and all includes superalloy base and SiC briquetting down with lower anchor clamps, wherein: a stud with external threads is arranged on one side end face of the high-temperature alloy base, a columnar groove is arranged on the other side end face of the high-temperature alloy base, and an annular outer edge extending inwards is arranged at a notch of the columnar groove; the SiC pressing block is embedded in the columnar groove, and the structure of the SiC pressing block is matched with the shape of the columnar groove; during the test, the metal glass sample is clamped between the two SiC pressing blocks of the upper clamp and the lower clamp.

2. The high-temperature compression jig for a fine metallic glass test according to claim 1, characterized in that: when in test, the high-temperature compression clamp is matched with a testing machine for use; two ends of the metal glass sample are respectively abutted against the SiC pressing blocks of the upper clamp and the lower clamp, and the stud of the high-temperature alloy base is fixed on the high-temperature clamp of the testing machine.

3. The high-temperature compression jig for a fine metallic glass test according to claim 1, wherein: the size of the external thread on the stud is matched with the internal thread of the high-temperature clamp of the testing machine, and when the high-temperature alloy base is fixed, the thread end part of the stud is pressed against the high-temperature clamp of the testing machine, so that the high-temperature alloy base cannot rotate in the high-temperature compression process.

4. The high-temperature compression jig for a fine metallic glass test according to claim 1, wherein: the high-temperature alloy base is made of a high-temperature alloy material, and the high-temperature alloy material is a nickel-based high-temperature alloy, an iron-based high-temperature alloy or a cobalt-based high-temperature alloy; the SiC pressing block is made of silicon carbide (SiC).

5. The high-temperature compression jig for a fine metallic glass test according to claim 1, characterized in that: the thickness of the annular outer edge at the notch of the columnar groove is less than or equal to 0.8 mm.

6. The high-temperature compression jig for a fine metallic glass test according to claim 1, characterized in that: the metallic glass sample is of a cylindrical structure.

7. The high-temperature compression jig for a fine metallic glass test according to claim 1, characterized in that: during the test, both ends of the metallic glass sample were in contact with only the surface of the SiC compact.