JPS60203379A - Joining method of amorphous alloy - Google Patents

Abstract

PURPOSE:To join securely amorphous alloys to each other or to various metals while maintaining the amorphous structure by applying ultrasonic oscillation to the joint surfaces of the metallic materials one of which consists of the amorphous alloy under the pressure. CONSTITUTION:Amorphous alloys or said alloy and the other metallic material (blank joint material) 1, 2 are superposed and are grasped by an oscillating bar 3 and an anvil 4. Ultrasonic oscillation is transmitted from a magnetostrictive oscillator 6 via a transducer 7 to the bar 3 to join the blank materials 1, 2 under the pressurization by a pressure P. A tip 5 is used after the same is properly exchanged with a knurled, smooth or other chips according to the materials 1, 2. If the pressure P is increased, the optimum time for applying the ultrasonic wave decreases and said time is preferably about <=3sec. The secure joint at least one of which is the amorphous alloy is obtd. while the amorphous structure is maintained by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for joining amorphous metal, particularly to a joining method using ultrasonic vibration.

(Prior Art) Amorphous alloys exhibit outstanding characteristics in terms of agility properties, corrosion resistance, 41-year corrosion resistance, etc., and are attracting attention as a wood that opens up the realm of traditional Japanese maple.

However, in order to obtain an amorphous structure, it is safe to rapidly cool the material from the bath melt state, so the form of the material obtained is limited to an ultra-thin plate or powder, and members of any shape and thickness can be produced. I can't get it. In addition, in order to take advantage of its properties as a composite material, it is often necessary to bond it with pond materials.

Conventionally, amorphous alloy materials have been joined by either spot heat welding or adhesion using a bath agent. However, in the former, there is a problem that the structure changes due to the influence of heat and crystallization occurs, and in the latter, the adhesive is involved in the joint, so it cannot be said that it is a perfect four-structure, and both are amorphous alloys. The i11% property of the bonding method decreased, and it was not an effective bonding method.

(Objective of the invention) This invention provides a method for maintaining an amorphous structure. !
The present invention aims to provide a method for joining amorphous alloy materials that can be joined to r-type metals in the same manner as l1i8i.

(Structure of the Invention) This invention is applicable to cases where it is difficult to obtain a sound joint by fusion welding, or when joining between different materials or dissimilar materials is desired.
There are friction welding, explosion welding, diffusion welding, and ultrasonic welding.
r1′ ability and is capable of producing large lids.
By applying the ultrasonic bonding method to amorphous alloy materials, it has become possible to firmly bond amorphous alloys or their alloys to various types of gold molten metal while maintaining the amorphous structure. .

The actual yIM and U will be explained in detail below with reference to the drawings.

Figure 1 is a schematic diagram of an ultrasonic welding machine, in which an amorphous alloy or a gold maple material 1.2 made of the same alloy is clamped by a vibrating rod 3 and an anvil 4 and is applied with a public pressure P. Press. At this time, it is preferable to replace the tip 5 of different shapes, such as knurled or smooth, at the tip of the vibrating rod depending on the material to be joined. Ultrasonic vibrations are transmitted from the v11 strain oscillator 6 excited by the oscillation circuit 8 to the vibrating rod 3 via the transducer 7.

In the case of the following examples, the output is 1.2KW and the amplitude is about 50
The application time of the ultrasonic wave is approximately θ, 1 to 3 seconds, the applied force is 30 to 200 kgf/crn2, and the bonding area is 10×
The case of 8tnm2 is shown.

The materials used in the test soap and their components are shown in the table below, and the composition of the materials that could be joined under the above conditions is shown in Figure 2.

Generally, a strong bond can be obtained by increasing the frictional energy under the same pressure.

1-Kashi, Az-? A material with a small elastic modulus, such as cu, is susceptible to work hardening due to plastic deformation, and cranks are likely to occur near the joint. Conversely, materials with a large elastic modulus, such as amorphous alloys and molybdenum, tend to become more prone to voids and cracks as internal deformation increases.

Furthermore, if the ultrasonic application time exceeds 2 to 3 seconds for any material, fatigue cracks will occur in the joint.

In this way, depending on the material, there is an optimal combination of amplitude, applied force, and application time, and part of that relationship is shown in Figure 3.If the 0 applied force is increased, ti' is the optimal application time. is the short axis.

(Effects of the Invention) The joining method of the present invention does not cause crystallization of the amorphous composite carpet, which was previously difficult to do between amorphous gold X or amorphous 91i@ and Ike's metal material.
Figure 4 shows MBF15 (a), the material used for bonding, and its ultrasonic bonding machine (b). This is a measurement comparison of the X-ray diffraction intensity of the spot welded material ((+)) and the annealed material (d).In the annealed material (d), due to crystallization, the The diffraction intensity is strong, and diffraction due to partial crystallization can be seen in the spot welded material (e), although it is not as clear as in (d).On the other hand, in the ultrasonic welded material (b), diffraction is seen in the wood. It shows the same diffraction intensity distribution as in (a), and it is clear that no signs of crystallization are observed.

Further, the presence or absence of crystallization is closely related to the degree of moderation increase in the joint. Therefore, we applied thermophilic fungi to the joint site, applied ultrasound for 2 seconds, and measured the temperature rise.
It was found that the temperature was between 260°C and 340°C at the joint, and below 250°C at a point 2 mm away from the weld.

On the other hand, by heating an amorphous alloy at a constant rate from 20°C to crystallize it, we looked at the time and temperature range in which crystallization occurs by changing the temperature increase relationship. Figure 5 shows the results. Shown below.

Region I is amorphous, region B is crystalline, and the intermediate region is a region where crystallization progresses and is partially crystallized.By the way, the temperature increase state in the case of ultrasonic bonding described above is When plotted on the phase diagram, it is shown by points U and W, and it is clear that it is in the amorphous region.

Figure 1g6 shows the results of measuring the breaking strength of the bonding material in order to measure the bonding strength.

It is difficult to perform a tensile test on the bonding material in the direction perpendicular to the bonding surface, so the tensile test was conducted in the direction of the thick arrow in FIG. The graph on the left side of the figure shows the breaking strength of unbonded wood, and the shaded bar graph shows the breaking strength of bonded material. In the figure (dl) (e) shows the case of bonding gold@materials for comparison.

As is clear from the figure, in the bonding material of amorphous gold material and metal material, fracture Fg occurs in the base material of the metal material.
In the case of a bonded material made of amorphous materials that are fractured or sheared at the r or joint portion and whose strength is the same as that of the base material, a slight decrease in strength is observed. However, on the fractured surface, a phenomenon is observed in which one material is peeled off and the other surface is exposed to Vr, and the strength of the joint itself is considered to be on the same level as that of the base material.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the configuration of an ultrasonic welding machine used in the welding method of the present invention, Fig. 2 is a diagram of the arrangement of materials that can be joined in multiple ways by the method of the present invention, and Fig. 3 is a diagram showing suitable processing. Figure 4 is a graph showing the relationship between pressure and ultrasonic application time, Figure 4 is a XIw diffraction robustness distribution diagram of a bonding material made by the method of the present invention and its comparative material, Figure 5 is a phase diagram of crystalline and amorphous states in the turbidity region. , Figure 6 shows ultrasound #? , is a graph showing the fracture strength of composite material. 1.2: Bonding material 3: Vibrating rod 4: Anvil 5: Chip 6: J11il sound oscillator 7: Transducer Patent applicant New Technology Development Corporation Applicant's agent Patent attorney Fumi Sato Figure 3 Bonding pressure MPa Chapter Figure 4 Scattering angle 2θ

Claims (1)

[Claims] 1) Gold, at least one of which is an amorphous alloy!
2. Amorphous alloy joining method 2, characterized in that materials are joined by applying ultrasonic vibration under pressure to the joining surfaces thereof. In the method according to claim 1, the ultrasonic application time is A method for joining amorphous alloys, characterized in that the time is 3 seconds or less