JP2006274312A - Heat treatment method, alloy, and heat treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel heat treatment method of producing an alloy. <P>SOLUTION: The heat treatment method for the alloy applies ultrasonic waves to the alloy while heat-treating. The frequency of the ultrasonic waves is preferably within a range from 100 kHz to 1 MHz. The frequency of the ultrasonic waves is more preferably within a range from 200 kHz to 1 MHz. When the melting point (absolute temperature) of the alloy is defined as Tm, the heat treatment temperature is preferably within a range from 0.2 to 0.9 Tm. The heat treatment temperature is further preferably within a range from 0.3 to 0.5 Tm. The heat treatment method can be implemented by a heat treatment apparatus having an ultrasonic wave generation section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a novel heat treatment method for producing an alloy.
The present invention also relates to a novel alloy produced by this heat treatment method.
The present invention also relates to a novel heat treatment apparatus for producing this alloy.

  Non-ferrous metals such as aluminum and copper alloys have low strength as cast and require strengthening treatment. Of various strengthening means, precipitation strengthening by aging heat treatment is known as an extremely effective hardening treatment means.

  In precipitation strengthening, the larger the volume fraction of precipitates and the larger the volume per precipitate, that is, the higher the number density, the more effective the strengthening. For the aging treatment, after the solution treatment, the temperature is maintained at a temperature at which precipitation occurs. It is known that the number density of precipitates increases as the aging heat treatment temperature decreases. Therefore, the aging heat treatment is more effective for strengthening at a lower temperature and longer time.

The inventor has disclosed the technical contents related to the present invention (see, for example, Non-Patent Document 1).
Tadashi Akama, Hideki Hosoda, Junya Ina, Kenji Wakashima, Sadayuki Kamiha, Kentaro Nakamura, Tatsuo Sato, Shuji Hanada, The Japan Institute of Metals 2004 Autumn (135th) Conference Outline (2004) P280, Lecture No. 112, 2004 September 28-30, "Effect of ultrasonic application on age hardening behavior of aluminum alloy"

  However, the required processing time increases exponentially with decreasing temperature. Industrially, the time during which the aging treatment can be performed is limited. For example, an Al-4% Cu alloy requires a treatment at 150 ° C. for about 10 days in order to obtain the highest altitude.

  Since precipitation strengthening is rate-limited by atomic diffusion, if the same treatment is performed at a lower temperature, a longer time is required and a treatment time of several months to several years is required. This has been a big problem in terms of productivity and energy consumption.

  For this reason, the process which lowers an aging temperature without changing an aging treatment time or changing an aging temperature low is an issue.

  Under such circumstances, the development of a new heat treatment method for producing an alloy, a new alloy produced by this heat treatment method, or a new heat treatment apparatus for producing this alloy, which solves the above-mentioned problems, has been made. It is desired.

This invention is made | formed in view of such a subject, and it aims at providing the novel heat processing method which manufactures an alloy.
Another object of the present invention is to provide a novel alloy produced by this heat treatment method.
Another object of the present invention is to provide a novel heat treatment apparatus for producing this alloy.

  In order to solve the above-described problems and achieve the object of the present invention, the heat treatment method of the present invention is characterized by applying ultrasonic waves to the alloy in the heat treatment method of the alloy.

  The alloy of the present invention is characterized by being heat treated by applying ultrasonic waves.

  The heat treatment apparatus of the present invention is an alloy heat treatment apparatus, and has an ultrasonic wave generator.

The present invention has the following effects.
Since the present invention applies ultrasonic waves to the alloy in the alloy heat treatment method, a novel heat treatment method can be provided.

  Since the present invention has been heat-treated by applying ultrasonic waves, a novel alloy can be provided.

  The present invention can provide a novel heat treatment apparatus because the alloy heat treatment apparatus has an ultrasonic wave generator.

  Hereinafter, the best mode for carrying out the invention according to a heat treatment method, an alloy, and a heat treatment apparatus will be described.

  The heat treatment method of the present invention is a method of heat-treating an alloy with ultrasonic waves.

  Alloys to be heat-treated are age hardening type alloys and precipitation hardening type alloys (heat treatment type alloys), and examples include aluminum alloys, copper alloys, nickel alloys, titanium alloys, magnesium alloys, iron alloys, and gold alloys. it can.

  Specifically, as an aluminum alloy for rolling, JIS standard 2000 series alloys (Al-Cu-- such as Al-4wt% Cu-0.5wt% Mg alloy (2017 aluminum alloy), Al-4wt% Cu (2024 aluminum alloy)) Mg-based alloy), 6000-based alloy (Al-Mg-Si) -based, 7000-based alloy (Al-Zn-Mg-based), and aluminum alloys for casting include AC1B alloy (Al-Cu-Mg-based), AC2A, AC2B alloy (Al-Cu-Si system), AC5A alloy (Al-Cu-Ni-Mg alloy), etc. can be mentioned.

  Examples of copper alloys include JIS standards C1700 and C1720 beryllium copper.

  Examples of the nickel alloy include JIS standards NCF750 (Inconel X-750) and NCF718 (Inconel 718).

  Examples of the titanium alloy include ASTM standard B348GR5 (Ti-6Al-4V), F136 (Ti-6Al-4V ELI), F1295 (Ti-6Al-7Nb), and the like.

  Examples of the magnesium alloy include ASTM standards AZ91D (Mg-9Al-1Zn), ZK51, ZK61 (Mg-Zn-Zr), and ZE41 (Mg-Zn-RE-Zr, RE: rare earth element).

  Examples of the iron alloy include stainless steel JIS standard SUS631CS.

  Examples of the gold alloy include Au-25Cu and Au-13Ag-1Pt-8Ag.

  The frequency of the ultrasonic wave is preferably in the range of 100 kHz to 1 MHz. When the ultrasonic frequency is 100 kHz or more, there is an advantage that the precipitation behavior during the aging heat treatment is affected, and the aging behavior can be promoted or suppressed. When the frequency of the ultrasonic wave is 1 MHz or less, there is an advantage that it is easy to manufacture an element capable of giving an output sufficient to influence the deposition behavior of a piezoelectric element used for ultrasonic oscillation industrially.

  Moreover, it is preferable that the frequency of an ultrasonic wave exists in the range of 200kHz-1MHz. When the frequency of the ultrasonic wave is 200 kHz or more, there is an advantage that the age hardening behavior can be accelerated, and the aging heat treatment can be performed at a lower temperature when the heat treatment is shortened or at the same time. When the frequency of the ultrasonic wave is 1 MHz or less, there is an advantage that it is easy to manufacture an element capable of giving an output sufficient to influence the deposition behavior of a piezoelectric element used for ultrasonic oscillation industrially.

  The output of the ultrasonic wave is preferably within a range of 10 to 10,000 W. When the ultrasonic output is 10 W or more, there is an advantage that the penetration distance of the ultrasonic wave into the material is relatively long and the aging behavior of the part other than the extreme surface part can be affected. When the output of the ultrasonic wave is 10000 W or less, there is an advantage that cooling for preventing the ultrasonic vibrator from being heated can be sufficiently performed due to the heat generated when the ultrasonic wave is generated.

  When the melting point (absolute temperature) of the alloy is Tm, the heat treatment temperature is preferably in the range of 0.2 Tm to 0.9 Tm. More preferably, the heat treatment temperature is in the range of 0.25 Tm to 0.7 Tm. More preferably, the heat treatment temperature is in the range of 0.3 Tm to 0.6 Tm. More preferably, the heat treatment temperature is in the range of 0.3 Tm to 0.5 Tm.

  When the heat treatment temperature is 0.2 Tm or more, there is an advantage that the motion of atoms oscillating by heat can be promoted / suppressed by ultrasonic waves. When the heat treatment temperature is 0.25 Tm or more, this effect becomes more remarkable. If the heat treatment temperature is 0.3 Tm or higher, this effect becomes even more remarkable.

  When the heat treatment temperature is 0.9 Tm or less, vibration that can be applied by ultrasonic waves cannot be ignored with respect to atomic vibration caused by heat, and there is an advantage that apparent atomic vibration can be affected. This effect becomes more remarkable when the heat treatment temperature is 0.7 Tm or less. When the heat treatment temperature is 0.6 Tm or less, this effect becomes more remarkable. When the heat treatment temperature is 0.5 Tm or less, this effect becomes more remarkable.

  Note that the melting points of Al-4 wt% Cu-0.5 wt% Mg alloy and Al-4% Cu alloy, which are aluminum alloys, are 620 to 640 ° C, and Tm is an average value of 630 ° C.

  In the heat treatment method of the present invention, when the frequency of the ultrasonic wave is a predetermined value or more, there is an effect of promoting age hardening. The following reasons can be considered for promoting age hardening. For example, the diffusion rate of water is known to be fast as a substance, but it is well known that when dissolving sugar or the like in water or hot water, it dissolves faster when mixed than standing still. However, the velocity of such a flow is slow compared to the velocity of atomic movement. Even if it is lower than the velocity of atomic motion, it is thought that if a flow that can control it is given, atomic motion (= diffusion) will be affected, and diffusion will be accelerated.

  Thus, by applying high-frequency ultrasonic waves during the aging treatment, the aging treatment time for obtaining the same strength can be shortened, and the treatment temperature can be lowered with the same aging time.

  Since high-frequency ultrasonic waves are highly attenuated, it is considered unsuitable for processing a large sample. Therefore, it is considered that a local or small thin sample is suitable for this processing. Moreover, although it is necessary to apply an ultrasonic wave, aging can be accelerated | stimulated locally if an ultrasonic generator is reduced in size.

  For this reason, it is conventionally possible to reinforce locally by ultrasonic treatment using a high-strength age-hardening-type alloy in a welded portion where it is difficult to use an age-hardening-type alloy and only a non-heat-treatable alloy can be used. Similarly, it is possible to measure the hardening of only the necessary part such as the surface alone.

  Moreover, the aging process of the member which receives damage when temperature rises can be performed. For example, aging heat treatment can also be performed so as not to damage other parts by using it in places where processing at high temperatures is difficult, such as semiconductor lead frames.

  Lead frames need strength, and precipitation strengthened copper alloys are used. Since semiconductors are vulnerable to heat, it is effective to perform heat treatment at a low temperature or shorten the treatment time. Since the lead frame is small and thin, ultrasonic treatment is considered effective.

  On the other hand, in the heat treatment method of the present invention, when the frequency of the ultrasonic wave is smaller than a predetermined value, there is an effect of suppressing age hardening. The reason for suppressing age hardening is that after position exchange between atoms and vacancies occurs, position exchange occurs again in the same atoms and vacancies, and the precipitate precursors that are generated are destabilized. It is thought that.

  When aging heat treatment is attempted when materials having different age-hardening behavior are combined by welding or the like, either material cannot obtain sufficient strength or becomes weak due to overaging. However, if age hardening can be suppressed by applying ultrasonic waves, for example, when the parts that age harden quickly are small, the ultrasonic wave is applied only to that part to suppress the age hardening behavior, and the whole is adjusted to a large and slow age hardening member. By performing an age hardening treatment, it is possible to obtain an optimum strength at any place. In addition, it is possible to bring about an optimum material characteristic considering strength and ductility depending on a place and location, such as suppressing aging in a member requiring ductility rather than strength.

  The heat treatment apparatus of the present invention is an alloy heat treatment apparatus, and has an ultrasonic wave generator. The heat treatment apparatus of the present invention includes an ultrasonic wave generation unit that applies ultrasonic waves and a heat treatment unit that performs heat treatment of materials, and is configured to perform heat treatment while applying ultrasonic waves.

  As the ultrasonic wave generator, a piezoelectric element such as PZT or barium titanate can be employed.

  As a heating method, an electric furnace, light such as laser or infrared, electromagnetic waves, high frequency induction heating, frictional heat, electric heating and the like can be employed.

  As the medium, water, silicon oil, alcohol, benzene, kerosene, liquid nitrogen, salt, lead, acetone, air, gel, plastic, copper, aluminum, steel, and the like can be used.

  From the above, according to the best mode for carrying out the present invention, since the present invention applies ultrasonic waves to the alloy in the heat treatment method of the alloy, a novel heat treatment method can be provided.

  In addition, according to the best mode for carrying out the present invention, since the present invention has been heat-treated by applying ultrasonic waves, a novel alloy can be provided.

  According to the best mode for carrying out the present invention, since the present invention has an ultrasonic wave generating section in an alloy heat treatment apparatus, a novel heat treatment apparatus can be provided.

  The present invention is not limited to the best mode for carrying out the above-described invention, and various other configurations can be adopted without departing from the gist of the present invention.

  Next, specific examples of the present invention will be described. However, it goes without saying that the present invention is not limited to these examples.

  A method for manufacturing the sample will be described. As samples, Al-4wt% Cu-0.5wt% Mg alloy and Al-4% Cu alloy were prepared.

  A heat treated aluminum alloy, Al-4wt% Cu-0.5wt% Mg alloy (2017 aluminum alloy) was used as a representative of heat treated aluminum alloy. This alloy is a typical aluminum alloy that undergoes age hardening at room temperature.

  First, an ingot of about 200 g of Al-4 wt% Cu was produced from 99.99% aluminum and pure copper metal by high frequency induction heating using an SSA-S alumina crucible. The produced alloy was heat-treated in the atmosphere at 520 ° C. for 1 hour with a muffle-type electric furnace, and quenched in ice water using pure water after the heat treatment. When a part of this alloy was subjected to ICP wet analysis, it was confirmed that an alloy having a predetermined composition was obtained. The surface of the ingot was polished with a grinder to sufficiently remove the surface oxide. Thereafter, a plate having a thickness of 1.5 mm and a width of 10 cm was produced by a cold rolling mill. After producing the plate, it was cut into a 1 cm square by a precision cutting machine. As a result, the test piece shape becomes 1 cm × 1 cm × 1.5 mm. The surface of this test piece was wet-polished with # 1200 emery paper. Then, in order to remove the processing strain and form a solution, put the square type test piece prepared previously in the SSA-S alumina crucible and heat-treat it in the atmosphere at 520 ° C for 1 hour in the muffle type electric furnace. It was. After the heat treatment, the crucible was taken out with a tong, the crucible was tilted, and only the sample was quenched in distilled water made into ice water within 3 seconds after taking out. Immediately after quenching, the distilled water was thoroughly agitated so that the sample was completely quenched.

  An Al-4% Cu alloy (2024 aluminum alloy) was used as an aluminum alloy that hardly age-hardens at room temperature. The manufacturing procedure and processing conditions are the same as described above.

The heat treatment apparatus used in this example will be described. Here, two heat treatment apparatuses were used.
FIG. 1 shows a heat treatment apparatus (hereinafter referred to as “heat treatment apparatus 1”) used in this example. The heat treatment apparatus 1 used a self-made ultrasonic vibration generator. This uses a piezoelectric element with a diameter of 4 cm as an ultrasonic vibrator, and can apply ultrasonic waves of 47 KHz, 100 KHz, 200 kHz, 400 KHz, 1 MHz. The output is 150W.

  The sample was positioned at the center of the bathtub of the heat treatment apparatus 1 so that the ultrasonic wave penetrated sufficiently. The size of the bathtub is about 20cm in length and 15cm in width. The depth is about 10cm. For installation, a rough stainless steel net with a 3 mm square stitch was used.

  When the test temperature was room temperature, about 1 liter of water was allowed to flow from the tap water every minute and drained from the heat treatment apparatus 1 so that the temperature was constant. Moreover, when it was room temperature or more, it kept at predetermined temperature with the temperature controller. A thermocouple was attached near the side of the sample and the temperature change during the ultrasonic treatment was monitored, and it was confirmed that the temperature change during the treatment was less than ± 1 ° C.

  In this case, the ultrasonic vibrator is circulated as cooling water so that the temperature does not rise, and the ultrasonic vibrator is kept at room temperature. In either case, the ultrasonic wave is irradiated from the lower part of the sample. The distance between the sample and the ultrasonic transducer is 5 cm.

  FIG. 2 shows another heat treatment apparatus (hereinafter referred to as “heat treatment apparatus 2”) used in this example. In order to verify whether or not the influence of ultrasonic waves can be seen on other than the room temperature aging aluminum alloy, a heat treatment apparatus 2 capable of applying ultrasonic waves even at a processing temperature of 100 ° C. or higher was produced. This uses a piezoelectric element having a diameter of 4 cm as an ultrasonic vibrator and can apply a 200 kHz ultrasonic wave. The output is 150W.

  The bathtub is made of stainless steel and can be used as an oil bath. The bottom surface is slanted at 45 degrees, and an ultrasonic vibrator is disposed there, so that the ultrasonic waves are uniformly transmitted in the bathtub. The dimensions of the bathtub are about 15 cm in length and width, and the depth at the center is about 15 cm. The ultrasonic vibrator is kept at room temperature during the heat treatment by flowing tap water as cooling water, as before. Silicon oil that can be used up to 250 ° C was placed in the bath. Further, the sample to be subjected to the ultrasonic wave application treatment was installed in the center of the bathtub so as to be in a predetermined place using a stainless steel net as before. The distance between the sample and the ultrasonic transducer is 5 cm. A thermocouple was also arranged in the same manner, and the temperature change during the process was monitored. As a result, as before, the temperature change during the treatment was within ± 1 ° C.

The heat treatment conditions will be described.
The Al-4wt% Cu-0.5wt% Mg alloy was heat treated by the heat treatment apparatus 1. The frequency of the ultrasonic wave was changed from 47 KHz to 1 MHz. The output of the ultrasonic wave was about 150W. The heat treatment temperature was changed from 10 ° C to 75 ° C. An aging treatment was performed at the same heat treatment temperature while applying ultrasonic waves and without applying ultrasonic waves, and the effects of applying ultrasonic waves were compared.

  The Al-4% Cu alloy was heat-treated with the heat treatment apparatus 2. The frequency of the ultrasonic wave was 200 KHz. The output of the ultrasonic wave was about 150W. The heat treatment temperature was changed from 120 ° C to 160 ° C. An aging treatment was performed at the same heat treatment temperature while applying ultrasonic waves and without applying ultrasonic waves, and the effects of applying ultrasonic waves were compared.

  An evaluation method for age hardening will be described. A Vickers hardness tester was used for the age hardening evaluation. The hardness of the sample during the heat treatment was measured with a Vickers hardness tester. The load was 300 g and the load time was 10 s. When the aging time exceeded 1 hour, 7 points were measured and the average value was adopted.

An evaluation result of the heat treatment will be described.
Fig. 3 is a diagram showing the effect of applying ultrasonic waves on the age hardening of an aluminum alloy when an Al-4wt% Cu-0.5wt% Mg alloy is used as a sample, the ultrasonic frequency is 47KHz, and the heat treatment temperature is 75 ° C. is there. The horizontal axis is aging time, and the vertical axis is Vickers hardness. As can be seen from FIG. 3, the age hardening curve was almost the same as no application in the case of 47 KHz ultrasonic waves. That is, it can be said that the ultrasonic wave in this case does not affect age hardening.

  Fig. 4 is a diagram showing the effect of ultrasonic wave application on age hardening of an aluminum alloy when an Al-4wt% Cu-0.5wt% Mg alloy is used as a sample, the ultrasonic frequency is 100KHz, and the heat treatment temperature is 75 ° C. is there. When ultrasonic waves of 100 KHz were applied as the ultrasonic wave application process, it took longer to cure when applied compared to when no ultrasonic wave was applied. When a 100 kHz ultrasonic wave is applied, it is considered that the hardness is lower than that when no ultrasonic wave is applied, and thus curing is suppressed. For example, when the ultrasonic wave is applied to the hardness indicated by the dotted line, the aging time is about 5 times. Thus, it can be seen that ultrasonic waves of 100 Hz or higher affect the age hardening behavior.

  Fig. 5 is a diagram showing the effect of ultrasonic wave application on age hardening of an aluminum alloy when an Al-4wt% Cu-0.5wt% Mg alloy is used as a sample, the ultrasonic frequency is 200KHz, and the heat treatment temperature is 75 ° C. is there. Age hardening was accelerated at 200 MHz. For example, when the ultrasonic wave is applied to the hardness indicated by the dotted line, the aging time is about 1/5. However, after sufficient processing time, the maximum intensity became a substantially constant value regardless of whether or not ultrasonic waves were applied. Thus, it can be seen that, at the same temperature, the maximum intensity depending on the treatment temperature does not depend on the application of ultrasonic waves. This can be said to be because the amount of precipitates causing an increase in strength depends only on temperature.

  Figure 6 shows the effect of ultrasonic wave application on age hardening of aluminum alloy when Al-4wt% Cu-0.5wt% Mg alloy is used as sample, ultrasonic frequency is 200KHz and heat treatment temperature is room temperature (average 17 ℃). FIG. Age hardening is promoted. For example, the aging time to reach the hardness indicated by the dotted line is about half. However, when the aging time is sufficiently long, the hardness does not change much regardless of whether or not ultrasonic waves are applied.

  FIG. 7 shows the effect of ultrasonic wave application on age hardening of aluminum alloy when Al-4wt% Cu-0.5wt% Mg alloy is used as a sample, ultrasonic frequency is 400KHz and 1MHz, and heat treatment temperature is 10 ° C. FIG. In the case of an ultrasonic frequency of 1 MHz, age hardening is promoted more than in the case of an ultrasonic frequency of 400 KHz.

  FIG. 8 is a diagram showing the influence of ultrasonic wave application on the age hardening of an aluminum alloy when an Al-4 wt% Cu alloy is used as a sample, the ultrasonic frequency is 200 KHz, and the heat treatment temperature is 140 ° C. When the aging temperature is 140 ° C., curing is promoted by application of ultrasonic waves, compared to the case where ultrasonic waves are not applied. For example, when ultrasonic waves are applied to achieve the hardness indicated by the dotted line, the aging time is about 1/400. As before, when the treatment time was sufficiently long, the hardness was the same regardless of whether or not ultrasonic waves were applied. This is because, as before, the maximum hardness depends only on the processing temperature. Therefore, this treatment is a material that causes age hardening, and it can be said that there is an effect of accelerating or suppressing the aging effect by applying ultrasonic waves if the treatment temperature is such that age hardening occurs.

  FIG. 9 is a diagram showing the influence of ultrasonic application on the age hardening of an aluminum alloy when an Al-4 wt% Cu alloy is used as a sample, the ultrasonic frequency is 200 KHz, and the heat treatment temperature is 160 ° C. When the aging temperature is 160 ° C., curing is greatly promoted compared to the case where no ultrasonic wave is applied. For example, when the ultrasonic wave is applied to the hardness indicated by the dotted line, the aging time is about 1/300.

  In addition, the influence of ultrasonic wave application on the age hardening of an aluminum alloy was investigated when an Al-4 wt% Cu alloy was used as a sample, the ultrasonic frequency was 200 KHz, and the heat treatment temperature was 120 ° C. When the aging temperature was 120 ° C., it was confirmed that curing was greatly accelerated compared to the case where no ultrasonic wave was applied.

It is a figure which shows an example of the apparatus used for this invention. It is a figure which shows the other example of the apparatus used for this invention. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy. It is a figure which shows the influence of an ultrasonic wave application with respect to age hardening of an aluminum alloy.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Thermometer, 2 ... Net, 3 ... Distilled water, 4 ... Sample, 5 ... Ultrasonic, 6 ... Ultrasonic vibrator, 7, 8 ... Cooling water, 9 ... Thermocouple, 10 ... Silicone oil, 11, 12 ... Heater, 13 ... Oil bath

Claims (15)

In the heat treatment method of the alloy,
A heat treatment method characterized by applying ultrasonic waves to an alloy. The heat treatment method according to claim 1, wherein the ultrasonic frequency is in a range of 100 kHz to 1 MHz. The heat treatment method according to claim 1, wherein an ultrasonic frequency is in a range of 200 kHz to 1 MHz. When the melting point (absolute temperature) of the alloy is Tm,
The heat treatment method according to claim 1, wherein the heat treatment temperature is in a range of 0.2 Tm to 0.9 Tm. When the melting point (absolute temperature) of the alloy is Tm,
The heat treatment method according to claim 1, wherein the heat treatment temperature is in a range of 0.3 Tm to 0.5 Tm. An alloy that has been heat-treated with ultrasonic waves. The alloy according to claim 6, wherein the frequency of the ultrasonic wave is in a range of 100 kHz to 1 MHz. The alloy according to claim 6, wherein an ultrasonic frequency is in a range of 200 kHz to 1 MHz. When the melting point (absolute temperature) of the alloy is Tm,
The alloy according to claim 6, wherein the heat treatment temperature is in the range of 0.2 Tm to 0.9 Tm. When the melting point (absolute temperature) of the alloy is Tm,
The alloy according to claim 6, wherein the heat treatment temperature is in the range of 0.3 Tm to 0.5 Tm. In alloy heat treatment equipment,
A heat treatment apparatus comprising an ultrasonic wave generation unit. The heat treatment apparatus according to claim 11, wherein an ultrasonic frequency is in a range of 100 kHz to 1 MHz. The frequency of an ultrasonic wave exists in the range of 200 kHz-1 MHz. The heat processing apparatus of Claim 11 characterized by the above-mentioned. When the melting point (absolute temperature) of the alloy is Tm,
The heat treatment apparatus according to claim 11, wherein the heat treatment temperature is in a range of 0.2 Tm to 0.9 Tm. When the melting point (absolute temperature) of the alloy is Tm,
The heat treatment apparatus according to claim 11, wherein the heat treatment temperature is in a range of 0.3 Tm to 0.5 Tm.

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