WO2010026793A1

WO2010026793A1 - Magnesium-based composite material having ti particles dispersed therein, and method for production thereof

Info

Publication number: WO2010026793A1
Application number: PCT/JP2009/055026
Authority: WO
Inventors: 勝義近藤; 貫太郎金子
Original assignee: 株式会社栗本鐵工所
Priority date: 2008-09-03
Filing date: 2009-03-16
Publication date: 2010-03-11
Also published as: KR20100092055A; US20110150694A1; JP2010059480A; JP4397425B1; EP2327808A1; CN102016094A

Abstract

Disclosed is a magnesium-based composite material having Ti particles dispersed therein, which comprises a magnesium matrix and titanium particles dispersed in the magnesium matrix homogeneously. In the composite material, the magnesium matrix and the titanium particles exhibit good wetting properties, and are therefore bound together without the need of interposing any titanium oxide at the interfaces between magnesium matrix and the titanium particles. The composite material has a tensile strength of 230 MPa or more.

Description

Ti particle-dispersed magnesium based composite material and method for producing the same

TECHNICAL FIELD The present invention relates to magnesium alloys, and in particular, titanium (Ti) particle-dispersed magnesium-based composites that can be used in a wide range of fields such as home appliances, automobile parts, and aircraft parts by improving both strength and ductility. It relates to a material and a method of manufacturing the same.

Since magnesium (Mg) has the smallest specific gravity among industrial metal materials, it is expected to be used for parts and members such as motorcycles, automobiles and aircrafts, for which there is a strong need for weight reduction. However, since the strength is not sufficient as compared with conventional industrial materials such as steel materials and aluminum alloys, the use of magnesium alloys is currently limited.

In order to solve such problems, development of a composite material in which particles, fibers and the like having characteristics of higher strength and higher hardness than magnesium are dispersed as a second phase has been advanced. Titanium (Ti) is considered as an effective second phase to be dispersed. When comparing stiffness, Mg: 45 GPa, Ti: 105 GPa, and comparing hardness: Mg: 35-45 Hv (Vickers hardness), Ti: 110-120 Hv, titanium particles are dispersed in the magnesium base By doing this, the effect of improving the strength and hardness of the magnesium-based composite material can be expected.

In the conventional composite materials, dispersion of ceramic particles such as oxides, carbides and nitrides and ceramic fibers is the main stream, but these particles and fibers all have high rigidity and hardness, but they have a ductility. Because they are poor, they reduce the ductility (e.g., elongation at break) of the composite itself when dispersed in a magnesium alloy. On the other hand, titanium is a metal, and itself is excellent in ductility, so there is no problem of reducing the ductility of the composite material when titanium particles are added and dispersed in magnesium.

On the other hand, magnesium has a problem that it is inferior in corrosion resistance. This has the characteristic that magnesium is superior, and for example, the standard electrode potential Es (hydrogen H is zero V) is as small as -2.356V. If a small amount of iron (Fe: Es = −0.44 V) or copper (Cu: Es = + 0.34 V) is contained in such magnesium, galvanic corrosion is caused by the potential difference between Mg-Fe and Mg-Cu. The phenomenon progresses. On the other hand, the standard electrode potential of titanium is −1.75 V, and the potential difference with Mg is smaller than that of aluminum (Al: Es = −1.676 V) which is an additive element to Mg. That is, it can be said that the influence on the corrosion phenomenon by dispersing titanium in magnesium is small.

From the above, it is considered effective to use titanium particles as a dispersion reinforcing material in a magnesium base.

As a technology relating to Ti particle-dispersed magnesium composite material that has been reported so far, for example, as Non-Patent Document 1, the Japan Institute of Metals Research Abstract (Mar. 26, 2008) p. 355, no. 464 (Kataoka, Hokusu: Influence of microstructure on mechanical properties of Ti particle-dispersed Mg-based composite material), as Non-Patent Document 2, Proceedings of the Light Metals Society of Japan (May 11, 2008) p. 13, No. 7 (Hokkaido, Kataoka, Komazu: Influence of addition of titanium particles on mechanical properties of magnesium), Non-Patent Document 3 as a summary of powder powder metallurgy lectures (June 6, 2007) p. 148, no. No. 2-51A (Hananami, Fujita, Ohara, Igarashi: Development of magnesium composites by bulk mechanical alloying method), Non-Patent Document 4 as powder and powder metallurgy, Vol. 55, No. 4 (2008), p. 244 (Hananami, Fujita, Motoe, Ohara, Igarashi, Kondo: Development of magnesium composite material by bulk mechanical alloying method), Non-Patent Document 5 as light metal, volume 54, 11 (2004), p. 522-526 (Sato, Watanabe, Miura, Miura: development of titanium particle-dispersed magnesium based functionally graded material by centrifugal solid phase method).

In Non-Patent Document 1 and Non-Patent Document 2, pure titanium particles are dispersed on the surface of a pure magnesium plate and heated and pressed in a state where the pure magnesium plate is placed thereon, the titanium particles are made pure magnesium plate. It is disclosed that a Ti particle dispersed magnesium base composite material in which titanium particles are arranged in a plane direction of a plate is prepared by preparing a composite material in a sandwiched state, and further heating and pressing this composite material in layers. There is.

According to Non-Patent Document 3 and Non-Patent Document 4, after hot-extrusion processing is carried out after continuously applying strong plastic processing while mixing magnesium alloy powder and pure titanium powder and filling in a mold. It is disclosed to produce a Ti particle-dispersed magnesium based composite material.

In any of the above non-patent documents 1 to 4, the heating temperature is set to a temperature sufficiently lower than the melting point of magnesium, and the composite material is manufactured in a complete solid phase temperature range without melting. In the result of the tensile test for each composite material, although the increase of strength of about 5-10% was confirmed compared with the material not adding Ti particles, the ductility (break elongation) is reduced by about 20-30%. . Since magnesium and titanium do not form a compound, the joint interface strength between the two is not sufficient, so that the strength improvement is not sufficient. On the other hand, it is recognized that the interface becomes a stress concentration part and the ductility decreases.

As described above, in order to significantly improve both the strength and the ductility in the titanium particle-dispersed magnesium-based composite material, it is necessary to improve the adhesion at the interface of Mg—Ti.

In Non-Patent Document 5, centrifugal force is applied to a molten metal of magnesium or magnesium alloy (AZ91D) containing titanium particles present as a solid phase, and the difference is caused by the difference in centrifugal force due to the density difference between dispersed particles and molten metal. A manufacturing method is described that uses compositional movement control to control compositional grading. Since the specific gravity of titanium is at least twice the specific gravity of magnesium, it is difficult to uniformly disperse titanium particles in a molten magnesium or magnesium alloy by the centrifugal solid phase method disclosed in Non-Patent Document 5 . In fact, this document states that "It is difficult to disperse titanium particles by this method." Furthermore, in this document, when the titanium particles are introduced into the melt of a magnesium alloy (AZ91D) containing aluminum and the centrifugal solid phase method is applied, the aluminum concentration is extremely high in the titanium particle aggregation portion. And, it is described that a region in which aluminum is solid-solved also exists in the outer peripheral portion of the titanium particles. The reason for this is that, in this document, "the initial melt with high aluminum concentration may have penetrated between the titanium particles by capillary action, and may have been involved in its aggregation and sintering. Thus, the AZ91D alloy containing aluminum The use of the centrifugal solid phase method was found to be problematic in view of the melt composition.

The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to achieve excellent properties by uniformly dispersing titanium particles in a magnesium base and improving the interfacial adhesion between titanium and magnesium. It is an object of the present invention to provide a Ti particle-dispersed magnesium-based composite material having a high strength.

The Ti particle-dispersed magnesium-based composite material according to the present invention is obtained by uniformly dispersing titanium particles in a magnesium matrix. The characteristics are that magnesium and titanium particles that constitute the base exhibit good wettability without being intercalated with titanium oxide at their interface and are bonded, and the magnesium-based composite material has 230 MPa or more It is to have tensile strength.

According to the present invention, it is possible to obtain a magnesium-based composite material having a high tensile strength of 230 MPa or more, because titanium particles of an appropriate amount exhibit good wettability and are uniformly dispersed in the base of magnesium.

One embodiment of the present invention is directed to a powder for producing the Ti particle dispersed magnesium based composite material described above. The powder is obtained by machining a cast material, in which titanium particles are uniformly dispersed in a magnesium base, into a powder.

The powder according to another embodiment of the present invention is a powder for producing the above-described Ti particle-dispersed magnesium-based composite material, and a molten metal of magnesium in which titanium particles are uniformly dispersed is solidified into a powder by an atomizing method. It is obtained by

The method for producing a Ti particle-dispersed magnesium based composite material according to the present invention comprises the steps of: introducing titanium particles into molten magnesium; stirring the molten metal so that the titanium particles are uniformly dispersed in the molten metal; Solidifying it to obtain a composite material in which titanium particles are uniformly dispersed in a magnesium base, and subjecting the composite material to hot plastic working to obtain a magnesium-based composite material having a tensile strength of 230 MPa or more Equipped with

In one embodiment, the step of obtaining the composite material comprises: solidifying the molten metal to obtain a cast material in which titanium particles are dispersed in a magnesium base; and machining the cast material to form a powder. And compacting the powder to obtain a compact.

In another embodiment, the step of obtaining the composite material includes solidifying the molten metal into a powder by an atomizing method, and powder-solidifying the powder to obtain a powder compact.

In another aspect, the method for producing a Ti particle-dispersed magnesium-based composite material according to the present invention comprises the steps of mixing magnesium powder and titanium particles, and holding the mixed powder at a temperature higher than the liquid phase generation temperature of the magnesium powder. And solidifying the mixed powder held at a high temperature, and subjecting the sintered and solidified body to hot plastic working to obtain a magnesium-based composite material having a tensile strength of 230 MPa or more. .

The technical significance or effects of the configuration of the present invention described above will be described in detail in the following items.

It is a figure and photograph for evaluating the wettability of pure magnesium and pure titanium. It is the photograph which observed the interface of pure magnesium and pure titanium with a scanning electron microscope. It is the photograph which observed the interface of both in the composite material obtained after heating and pressurizing the mixed powder of pure titanium powder and pure magnesium powder with a scanning electron microscope. It is an example of the structure | tissue photograph of the magnesium group composite powder which the titanium particle disperse | distributed inside. It is an external appearance photograph and structure observation photograph of Ti particle-dispersed magnesium group composite powder obtained by the water atomization method. It is a figure which shows the stress-distortion line of the extrusion material using the pure magnesium powder which does not contain a titanium particle, and the Ti particle dispersion magnesium base composite powder produced by two manufacturing methods. It is a figure which shows the change of the tensile strength (TS) and proof stress (YS) of each extrusion material with respect to a titanium addition amount. It is an optical-microscope observation photograph of each extruded material which changed content of titanium particle.

The inventors of the present application focused on the wettability of both of them and evaluated the characteristics thereof in order to develop a titanium particle-dispersed magnesium composite material capable of improving the interfacial adhesion between titanium and magnesium, as well as excellent wettability. We examined the manufacturing method of the composite material using the property.

(1) Wettability of Pure Magnesium and Pure Titanium The inventors of the present application examined the wettability of a pure titanium plate and a pure magnesium droplet. Specifically, droplets of pure magnesium melted in a high vacuum state (held at 800 ° C.) are statically arranged on the surface of a pure titanium plate from the tip of a nozzle made of magnesium oxide (MgO), and pure Mg and pure at 800 ° C. The wettability with Ti was evaluated by continuous shooting. The results are shown in FIG.

As shown in FIG. 1, the wetting angle was about 50 ° at the time of contact with the surface of the Ti plate (t = 0 seconds), and the wetting angle decreased with time and reached 13 ° after 6 minutes. Generally, it is judged that the wetting phenomenon occurs when the wetting angle is less than 90 °, and the wettability improves as the value approaches 0 °. Titanium carbide (TiC), which is said to have good wettability with magnesium, has a wetting angle of approximately 33 ° at 900 ° C (Reference: A. Contrerasa et al .: Scripta Materialia, 48 (2003) 1625-1630). When considered, the wettability between pure Mg and pure Ti is recognized to be extremely good.

After the evaluation of the wettability, the interface between pure Mg and the titanium plate after solidification was observed with a scanning electron microscope (SEM) on the test piece. The results are shown in FIG. It is observed that the melted Mg adheres well without gaps or gaps throughout the entire area in contact with the titanium plate.

For comparison, composites as reported in the prior art (Non-patent documents 1 to 4), ie composites obtained by heating and pressing mixed powder of pure titanium powder and pure magnesium powder at solid phase temperature of magnesium powder A material was produced and the bonding interface between the two was observed. The results are shown in FIG. In preparing the composite material, the heating temperature was set to 520 ° C. and set lower than the melting point of pure magnesium (650 ° C.) to obtain a completely solid state. As shown by the arrows, a large number of gaps and voids are observed at the interface between the Ti particles and the Mg base, and it can be seen that the adhesion is not sufficient. Therefore, in the manufacturing method disclosed in the prior art, the adhesion between Mg and Ti is not sufficient because heating and sintering are performed at a solid phase temperature below the melting point of Mg, and as a result, the strength and ductility in the composite material It is thought that no improvement was obtained.

(2) Composite Material Using Ti Particle-Dispersed Magnesium Melt Based on the above results, the present inventors based on the above results, in order to improve the adhesion of the interface between the magnesium base and the Ti particle, the Ti particle-dispersed magnesium by the following method A matrix composite was made. First, a molten magnesium was held at a temperature higher than the melting point of magnesium or a magnesium alloy constituting the base, and an appropriate amount of Ti particles was added to the molten metal. The molten metal was solidified after sufficiently stirring the molten metal so that the titanium particles were uniformly dispersed in the molten metal. In a magnesium-based composite material produced by such a method, the magnesium and titanium particles constituting the base exhibit excellent wettability and excellent adhesion without the titanium oxide being intervened in their interface. Have a bond. By subjecting the magnesium-based composite material to hot plastic working, a Ti particle-dispersed magnesium-based composite material having a tensile strength of 230 MPa or more can be obtained.

A composite material in which titanium particles are uniformly dispersed in a magnesium base can also be manufactured by a conventional casting method, die casting method or the like. In addition, the cast materials can be machined such as cutting and grinding to make them into powder. In the magnesium-based composite powder thus obtained, titanium particles are uniformly dispersed in the matrix of magnesium. An example of a photograph of the structure of this magnesium-based composite powder is shown in FIG. As apparent from FIG. 4, no void is observed at the interface between the Ti particles and the Mg base, and it is recognized that the adhesive has good adhesion.

A magnesium-based composite powder in which titanium particles are uniformly dispersed in a magnesium base can also be obtained by solidifying magnesium melt in which titanium particles are uniformly dispersed by an atomizing method. As a specific method, the present inventors dissolve pure magnesium in a carbon crucible, add 3 mass% of pure titanium powder (average particle size: 29.8 μm) to the melt, and sufficiently stir The molten metal was discharged from the bottom of the crucible as a molten metal flow, and high-pressure water was injected into the molten metal flow (water atomization method) to obtain a solidified powder. The appearance photograph of the obtained powder and the structure observation result inside powder are shown in FIG. Also in this water atomized powder, no void is observed at the interface between the Ti particles and the Mg base, and it is recognized that the powder has good adhesion.

As described above, after titanium particles are added to molten magnesium and subjected to sufficient uniform stirring treatment, then a magnesium base composite material is obtained by a casting method or a die casting method, or magnesium in which titanium particles are uniformly dispersed. In any of the cases where the molten metal is directly powdered by the atomizing method, the titanium particles and the base magnesium are bonded together with good adhesion without voids due to excellent wettability.

After heating a Ti particle-dispersed magnesium-based composite material produced by casting or die casting to a predetermined temperature, the material is subjected to hot plastic working such as hot extrusion, hot rolling, forging, etc. Thus, the grains of the base are refined and the strength of the composite material is further improved. For example, the tensile strength of the composite material is 230 MPa or more.

In addition, Ti particle dispersed magnesium base composite powder manufactured by machining process such as cutting from cast material, or Ti particle dispersed magnesium base composite powder obtained by injecting high pressure water or high pressure gas to molten metal flow is compacted and solidified. Powdered compacts and sintered / solidified bodies are prepared, and if necessary, the composite powders are joined together metallurgically by subjecting them to hot plastic working such as hot extrusion, hot rolling, forging etc. Alternatively, it is possible to create a sintered Ti particle-dispersed magnesium-based composite material.

In the above embodiment, titanium particles of an appropriate amount were charged into a molten magnesium, but as another embodiment, it is also possible to obtain a Ti particle-dispersed magnesium based composite material by the following method. In this embodiment, magnesium powder and titanium particles are mixed, and the mixed powder is held at a predetermined temperature to sinter and solidify. The important thing here is to keep the mixed powder at a temperature higher than the liquid phase generation temperature of the magnesium powder. By maintaining at such a high temperature, in the sintered and solidified body after sintering, magnesium and titanium particles constituting the base have good wettability without the interposition of titanium oxide at their interface. To be bonded with excellent adhesion. By subjecting the sintered and solidified body to hot plastic working, a Ti particle-dispersed magnesium-based composite material having a tensile strength of 230 MPa or more can be obtained.

Pure magnesium lumps having a purity of 99.8% and titanium powder having an average particle diameter of 29.8 μm were prepared as starting materials. Pure magnesium lumps are melted by heating to 750 ° C in a carbon crucible, and the above Ti particles are added to the melt under the three conditions of 0.5 mass%, 1.5 mass% and 2.8 mass% in total weight ratio did. Thereafter, the molten metal was sufficiently uniformly stirred to prevent segregation of the Ti particles and settling to the bottom, and then a Ti particle-dispersed magnesium-based composite powder was produced by a water atomizing method.

On the other hand, pure magnesium powder (average particle diameter: 162 μm) having a purity of 99.9% is prepared as a comparison, and the ratio of the above-mentioned Ti powder is 0.5 mass%, 1.5 mass%, 2.8 mass%. After weighing, they were mixed using a dry ball mill to produce an Mg—Ti mixed powder.

These powders are filled in a carbon mold, and pressed for 30 minutes (pressure: 30 MPa) at 550 ° C. in a vacuum atmosphere using a discharge plasma sintering apparatus to sinter and solidify the powders to a diameter of 45 mm. A billet for extrusion was made. Each Ti particle-dispersed magnesium powder billet was held at 200 ° C. for 5 minutes in an argon gas atmosphere, and immediately subjected to hot extrusion processing (extrusion ratio: 37) to produce a round bar extruded material with a diameter of 7 mm.

In addition, the round rod extruded material was produced based on said manufacturing procedure also about the pure magnesium powder which does not contain Ti particle as comparison.

Tensile test pieces were collected from the obtained three types of magnesium powder extruded materials, and tensile strength tests were conducted at normal temperature. The stress-distortion line in an extruded material using a pure Mg powder containing no Ti particles and an Mg powder containing 2.8 mass% of Ti particles produced by the two production methods is shown in FIG.

Compared with the strength and elongation characteristics of pure magnesium powder extruded material not containing Ti particles, tensile strength and yield strength of Ti particle dispersed magnesium based composite powder extruded material using water atomization method according to the present invention is about 35 to 40% It increased, and the breaking elongation was equal and showed a high value of 15% or more.

On the other hand, in the extruded material produced using the mixed powder of Ti particles and Mg powder, which is a comparative material, the tensile strength and the yield strength increased slightly by about 3 to 6%, but the breaking elongation decreased to less than 10%. . As a result of observing the fractured surface of the sample after the tensile test, in the comparative material, the crack has progressed at the interface between the Ti particle and the magnesium base, and the adhesion between the two is not sufficient. It was recognized that there was not.

Changes in tensile strength (TS) and proof stress (YS) of each extruded material with respect to the amount of added Ti are shown in FIG. In the Ti particle-dispersed magnesium-based composite powder extruded material using the water atomizing method according to the present invention, both the tensile strength and the proof stress increase with the increase of the Ti particle content, and the high value by the uniform dispersion of the Ti particles The effect of strengthening was confirmed. This is a result of the improvement in adhesion between the Ti particles and the magnesium in the molten metal due to the excellent wettability as described above.

On the other hand, when sintering and extruding and solidifying in the solid phase temperature range using a mixed powder of Ti powder and Mg powder, which is a conventional production method, the tensile strength of the extruded material and the addition amount of Ti particles increase. The yield strength tends to decrease, and it was recognized that the dispersion strengthening by the Ti particles was not sufficient.

In the same manner as in Example 1, a pure magnesium lump having a purity of 99.8% and a titanium powder having an average particle diameter of 29.8 μm were prepared as starting materials. Magnesium lumps were melted by heating to 750 ° C. in a carbon crucible, and the above-described Ti particles were added to the melt under the three conditions of 1 mass, 3 mass%, and 5 mass% in the total weight ratio. Thereafter, the molten metal was sufficiently uniformly stirred to prevent segregation of the Ti particles and settling to the bottom, and then the molten metal was cast into a cylindrical mold to prepare a billet having a diameter of 60 mm. A billet for extrusion with a diameter of 45 mm is produced from each cast billet by machining, each billet is held at 200 ° C. for 5 minutes in an argon gas atmosphere, and hot extrusion (extrusion ratio: 37) is applied immediately to a diameter of 7 mm. The round bar extruded material of

The optical microscope observation result of each extruded material is shown in FIG. The proportion of Ti particles in the extruded material also increases as the amount of added Ti particles increases, and even when 5 mass% of Ti particles is added, the aggregation and segregation phenomena of Ti particles are not observed, and uniform in the magnesium base It is understood that it is dispersed.

The tensile test results of each extruded material are shown in Table 1.

In the same manner as in Example 1, in the extruded material obtained by subjecting the Ti particle magnesium base composite material produced by using the casting method according to the present invention to extrusion processing, the tensile strength is increased as the content of Ti particles increases. Both the strength and the load resistance increase, and no remarkable decrease in the elongation at break is observed. From the above results, in the Ti particle-dispersed magnesium-based composite material according to the present invention, it is possible to improve the strength of the magnesium material by adding Ti particles without causing aggregation and segregation of the Ti particles.

In the same manner as in Example 1, a pure magnesium lump having a purity of 99.8% and a titanium powder having an average particle diameter of 29.8 μm were prepared as starting materials. The magnesium lump was melted by heating to 750 ° C. in a carbon crucible, and the above-mentioned Ti particles were added to the molten metal in the total weight ratio of 2 mass% and 4 mass%, respectively. Thereafter, the molten metal was sufficiently uniformly stirred to prevent segregation of the Ti particles and settling to the bottom, and then the molten metal was cast into a cylindrical mold to prepare a billet having a diameter of 60 mm. Chips having a total length of about 1 to 4 mm were produced from each cast billet by cutting.

As a result of structure observation of each chip, Ti particles were uniformly dispersed in the Mg base without aggregation and segregation. Then, the chips were filled in a mold made of SKD11 and a pressing force of 600 MPa was applied by a hydraulic press to produce a powder compact billet having a diameter of 45 mm. Each billet was held at 300 ° C. for 5 minutes in an argon gas atmosphere, and immediately subjected to hot extrusion (extrusion ratio: 37) to produce a round bar extruded material with a diameter of 7 mm.

When tensile test pieces were taken from each of the magnesium powder extruded materials and subjected to a tensile strength test at room temperature, the extruded materials using chips containing 2 mass% Ti had a tensile strength of 264 MPa and a breaking elongation of 15. In the extruded material using chips containing 4% and 4 mass% Ti, tensile strength: 294 MPa and breaking elongation: 13.74% were obtained. The tensile strength is increased with the increase of the addition amount of Ti particles without a significant decrease of the breaking elongation, and when the characteristics of the comparative material described in Example 1 are compared, the same amount of Ti particles is obtained. Even in the case of including, tensile strength and proof stress are increased.

From the above results, in the Ti particle-dispersed magnesium-based composite material obtained by the manufacturing method of the present invention described above, the strength of the magnesium material can be improved by the addition of the Ti particles, without the aggregation / segregation of the Ti particles.

In the same manner as in Example 1, a pure magnesium lump having a purity of 99.8% and a titanium alloy powder (Ti-6.1Al% -3.8V / mass%) having an average particle diameter of 22.8 μm were prepared as starting materials. Magnesium lumps were melted by heating to 750 ° C. in a carbon crucible, and the above Ti alloy particles were added to the melt under the three conditions of 1 mass%, 3 mass%, and 5 mass% in terms of the total weight ratio. Thereafter, the molten metal was sufficiently uniformly stirred to prevent segregation of the Ti alloy particles and settling to the bottom, and then the molten metal was cast into a cylindrical mold to prepare a billet having a diameter of 60 mm.

A billet for extrusion with a diameter of 45 mm is produced from each cast billet by machining, each billet is held at 200 ° C. for 5 minutes in an argon gas atmosphere, and hot extrusion (extrusion ratio: 37) is applied immediately to a diameter of 7 mm. The round bar extruded material of And the tensile test piece was extract | collected from each magnesium powder extruded material, and the tensile test was done at normal temperature.

The results are shown in Table 2. In addition, the tensile strength of the extruded material at the time of using the pure Ti particle | grain as described in Example 2 was used as a comparative value.

Even in the case of using Ti-6Al-4V alloy powder, in the Ti particle-dispersed magnesium-based composite material according to the present invention, the Ti alloy particles are uniformly dispersed in the base without aggregation and segregation, and the addition amount thereof increases As a result, the tensile strength is increased, and the increase in tensile strength is increased as compared with the case where pure Ti particles are added. That is, the strength of the magnesium composite material is further improved by further increasing the hardness and strength of the dispersed particles.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same or equivalent scope of the present invention.

The present invention can be advantageously used as a Ti particle-dispersed magnesium-based composite material having excellent strength and a method for producing the same.

Claims

In a Ti particle-dispersed magnesium-based composite material in which titanium particles are uniformly dispersed in a magnesium matrix,
The magnesium and titanium particles constituting the base exhibit good wettability without being intercalated with titanium oxide at their interface and are bonded, and have a tensile strength of 230 MPa or more. Ti particle dispersed magnesium base composite material.
It is a powder for producing the Ti particle-dispersed magnesium-based composite material according to claim 1;
A Ti particle-dispersed magnesium-based composite powder obtained by machining a cast material in which titanium particles are uniformly dispersed in a magnesium base into a powder.
It is a powder for producing the Ti particle-dispersed magnesium-based composite material according to claim 1;
A Ti particle-dispersed magnesium-based composite powder obtained by solidifying a molten metal of magnesium in which titanium particles are uniformly dispersed into a powder by an atomizing method.
Charging titanium particles into molten magnesium;
Stirring the melt such that the titanium particles are uniformly dispersed in the melt;
Obtaining the composite material in which the titanium particles are uniformly dispersed in a magnesium base by solidifying the molten metal;
And b. Subjecting the composite material to hot plastic working to obtain a magnesium-based composite material having a tensile strength of 230 MPa or more.
The step of obtaining the composite material includes solidifying the molten metal to obtain a cast material in which titanium particles are dispersed in a base of magnesium;
Machining the cast material into a powder form;
The method for producing a Ti particle-dispersed magnesium based composite material according to claim 4, comprising: compacting and solidifying the powder to obtain a powder compact.
The step of obtaining the composite material comprises solidifying the molten metal into a powder by atomization;
The method for producing a Ti particle-dispersed magnesium based composite material according to claim 4, comprising: compacting and solidifying the powder to obtain a powder compact.
Mixing magnesium powder and titanium particles,
Maintaining the mixed powder at a temperature higher than the liquid phase generation temperature of the magnesium powder;
Sinter-solidify the mixed powder held at the high temperature;
And b. Subjecting the sintered and solidified body to hot plastic working to obtain a magnesium-based composite material having a tensile strength of 230 MPa or more.