WO2014171549A1 - 難燃マグネシウム合金及びその製造方法 - Google Patents

難燃マグネシウム合金及びその製造方法 Download PDF

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WO2014171549A1
WO2014171549A1 PCT/JP2014/061105 JP2014061105W WO2014171549A1 WO 2014171549 A1 WO2014171549 A1 WO 2014171549A1 JP 2014061105 W JP2014061105 W JP 2014061105W WO 2014171549 A1 WO2014171549 A1 WO 2014171549A1
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formula
magnesium alloy
flame retardant
retardant magnesium
total
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PCT/JP2014/061105
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English (en)
French (fr)
Japanese (ja)
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河村　能人
鍾鉉 金
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国立大学法人 熊本大学
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Application filed by 国立大学法人 熊本大学 filed Critical 国立大学法人 熊本大学
Priority to KR1020157032433A priority Critical patent/KR20150140828A/ko
Priority to CN201480033445.8A priority patent/CN105283566A/zh
Priority to EP14785713.0A priority patent/EP2987875B1/de
Priority to US14/784,066 priority patent/US20160068933A1/en
Priority to JP2015512545A priority patent/JP6361051B2/ja
Publication of WO2014171549A1 publication Critical patent/WO2014171549A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent

Definitions

  • the present invention relates to a flame retardant magnesium alloy and a method for producing the same.
  • An object of one embodiment of the present invention is to provide a flame-retardant magnesium alloy having mechanical properties of a long-period laminated magnesium alloy and having an ignition temperature of 800 ° C. or higher, or a method for producing the same.
  • Zn is contained in a atom%
  • Y is contained in b atom%
  • Ca is contained in x atom%
  • the balance is Mg
  • a, b, and x are represented by the following (formula 1) to (formula 4).
  • a method for producing a flame retardant magnesium alloy comprising melting a flame retardant magnesium alloy to be filled.
  • the flame retardant magnesium alloy has an ignition temperature of 800 ° C. or higher (preferably 850 ° C. or higher).
  • the flame retardant magnesium alloy contains at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd in total in c atom%. , C satisfy the following (formula 6) and (formula 7), or satisfy (formula 7) and (formula 8).
  • the flame retardant magnesium alloy contains at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd in total in c atom%. , C satisfies the following (formula 6) and (formula 7), a method for producing a flame retardant magnesium alloy.
  • the flame retardant magnesium alloy contains a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atomic%,
  • filling (Formula 8) and (Formula 9).
  • the flame retardant magnesium alloy contains at least one element selected from the group consisting of Yb, Tb, Sm, and Nd in total c atom%, where c is The manufacturing method of the flame-retardant magnesium alloy characterized by satisfy
  • the flame retardant magnesium alloy contains at least one element selected from the group consisting of Yb, Tb, Sm and Nd in total c atom%, and La, Ce And at least one element selected from the group consisting of Pr, Eu, Mm, and Gd is contained in total in d atomic%, and c and d satisfy the following (formula 6) to (formula 8), or (formula A method for producing a flame retardant magnesium alloy characterized by satisfying 8) and (Equation 9).
  • the flame retardant magnesium alloy contains at least one element selected from the group consisting of Yb, Tb, Sm, and Nd in total c atom%, and La, Ce , Pr, Eu, Mm, and Gd at least one element selected from the group consisting of d in total, wherein c and d satisfy the following (formula 6) to (formula 8) A method for producing a flame retardant magnesium alloy.
  • the flame retardant magnesium alloy includes Th, Si, Mn, Zr, Ti, Hf, Nb, Ag, Sr, Sc, B, C, Sn, Containing at least one element selected from the group consisting of Au, Ba, Ge, Bi, Ga, In, Ir, Li, Pd, Sb, and V in total more than 0 atomic% and 2.5 atomic% or less.
  • a method for producing a flame-retardant magnesium alloy is
  • Zn is contained in a atom%
  • Y is contained in b atom%
  • Ca is contained in x atom%
  • the balance is Mg
  • a, b, and x are represented by the following (formula 1) to (formula 4):
  • a flame-retardant magnesium alloy characterized by being made of an alloy having a crystal structure satisfying a long-period laminated structure phase.
  • the alloy contains at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd in total c atom%, and c is A flame retardant magnesium alloy characterized by satisfying the following (formula 6) and (formula 7) or satisfying (formula 7) and (formula 8).
  • the alloy contains at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd in a total of c atomic%, and c is A flame-retardant magnesium alloy satisfying the following (formula 6) and (formula 7).
  • the alloy contains a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atom%. ) And (Formula 7).
  • the alloy contains at least one element selected from the group consisting of Yb, Tb, Sm, and Nd in total c atomic%, and c is represented by the following formula (Formula 6 ) And (Formula 7).
  • the alloy contains at least one element selected from the group consisting of Yb, Tb, Sm and Nd in total c atom%, and La, Ce, Pr, A total of at least one element selected from the group consisting of Eu, Mm, and Gd, containing d atom%, and c and d satisfy the following (formula 6) to (formula 8), or (formula 8) and A flame-retardant magnesium alloy satisfying (Equation 9).
  • the alloy contains at least one element selected from the group consisting of Yb, Tb, Sm and Nd in total c atom%, and La, Ce, Pr, Flame retardant magnesium comprising at least one element selected from the group consisting of Eu, Mm and Gd in a total of d atomic%, wherein c and d satisfy the following (formula 6) to (formula 8) alloy.
  • the alloy includes Th, Si, Mn, Zr, Ti, Hf, Nb, Ag, Sr, Sc, B, C, Sn, Au, Ba , Ge, Bi, Ga, In, Ir, Li, Pd, Sb, and at least one element selected from the group consisting of V and a total of more than 0 atomic% and 2.5 atomic% or less Flame retardant magnesium alloy.
  • the flame retardant magnesium alloy according to any one of [15] to [25], wherein the alloy is a casting.
  • FIG. 1 is a graph showing the relationship between the Ca content, the tensile yield strength, and the elongation when a tensile test is performed on the sample of the example at room temperature.
  • FIG. 2 is a graph showing the relationship between the Ca content, the tensile yield strength, and the elongation when the sample of the example is subjected to a tensile test at a temperature of 523K.
  • FIG. 3 is a graph showing the relationship between the Ca content of the sample of the example and the ignition temperature.
  • FIG. 6 is a graph showing the relationship between Al content, tensile strength, and elongation when a tensile test is performed on a sample of a comparative example at room temperature.
  • FIG. 7 is a graph showing the relationship between Al content, tensile strength, and elongation when a tensile test is performed on a sample of a comparative example at a temperature of 523K.
  • FIG. 6 is a graph showing the relationship between Al content, tensile strength, and elongation
  • FIG. 10 is an EDS image of an extruded material of Mg 95.7 Zn 2 Y 1.9 La 0.1 Al 0.3 alloy of a comparative example.
  • FIG. 11 is an EDS image of an extruded material of Mg 95.5 Zn 2 Y 1.9 La 0.1 Al 0.5 alloy of a comparative example.
  • ⁇ Embodiment 1> A method for producing a flame-retardant magnesium alloy according to one embodiment of the present invention will be described.
  • Zn containing a atomic%, Y containing b atomic%, Ca containing x atomic%, the balance being Mg, a, b and x are alloys satisfying the following (formula 1) to (formula 4) , Melt and cast at a temperature of 800 ° C. or lower (preferably 850 ° C. or lower).
  • This alloy has an ignition temperature of 800 ° C. or higher (preferably 850 ° C. or higher) by containing Ca. In this way, a magnesium alloy casting is produced.
  • the cooling rate at the time of casting is 1000 K / second or less, more preferably 100 K / second or less.
  • (Formula 1) 0.5 ⁇ a ⁇ 5.0
  • (Formula 2) 0.5 ⁇ b ⁇ 5.0
  • (Formula 3) 2 / 3a-5 / 6 ⁇ b
  • (Formula 4) 0 ⁇ x ⁇ 0.5 (preferably 0.1 ⁇ x ⁇ 0.5, more preferably 0.15 ⁇ x ⁇ 0.5)
  • Various processes can be used as a process for producing the above magnesium alloy casting. For example, high pressure casting, roll casting, inclined plate casting, continuous casting, thixo molding, die casting, and the like can be used. .
  • the magnesium alloy casting may be subjected to a homogenization heat treatment.
  • the heat treatment conditions at this time are preferably a temperature of 400 ° C. to 550 ° C. and a treatment time of 1 minute to 1500 minutes (or 24 hours).
  • plastic working is performed on the magnesium alloy casting.
  • the plastic working method for example, extrusion, ECAE (equal-channel-angular-extrusion) working method, rolling, drawing and forging, repetitive working thereof, FSW (friction stir welding) working or the like is used.
  • the extrusion temperature is 250 ° C.
  • the ECAE processing method is a method of rotating the sample longitudinal direction by 90 ° for each pass in order to introduce a uniform strain to the sample. Specifically, a magnesium alloy cast material as a molding material is forcibly entered into the molding hole of the molding die in which a L-shaped molding hole is formed. This is a method of applying a stress to the magnesium alloy casting at a portion bent at a degree to obtain a molded body having excellent strength and toughness.
  • the number of ECAE passes is preferably 1 to 8 passes. More preferably, it is 3 to 5 passes.
  • the temperature during processing of ECAE is preferably 250 ° C. or more and 500 ° C.
  • the rolling temperature is 250 ° C. or higher and 500 ° C. or lower and the rolling reduction is 5% or higher.
  • the temperature at the time of drawing is 250 ° C. or more and 500 ° C. or less, and the cross-sectional reduction rate of the drawing is 5% or more.
  • the temperature at the time of forging is 250 ° C. or more and 500 ° C. or less, and the processing rate of the forging is 5% or more.
  • the plastic working performed on the magnesium alloy casting preferably has a strain amount of 0.002 or more and 4.6 or less and a total strain amount of 15 or less.
  • the strain amount per time is 0.002 or less and 4.6 or less and the total strain amount is 10 or less.
  • the reason why the preferable total strain amount is set to 15 or less and the more preferable total strain amount is set to 10 or less is that, even if the total strain amount is increased, the strength of the magnesium alloy does not increase accordingly. This is because the more the number is, the higher the manufacturing cost becomes.
  • the amount of distortion in the extrusion process is 0.92 / times when the extrusion ratio is 2.5, 1.39 / time when the extrusion ratio is 4, and 2 when the extrusion ratio is 10. .30 / times, the extrusion ratio of 20 is 2.995 / times, the extrusion ratio of 50 is 3.91 / times, and the extrusion ratio is 100 is 4.61 / times. Yes, when the extrusion ratio is 1000, it is 6.90 / times.
  • the plastic workpiece obtained by plastic processing of the magnesium alloy casting as described above has a crystal structure of an hcp-structure magnesium phase and a long-period laminate structure phase at room temperature, and the volume fraction of the crystal grains having this long-period laminate structure.
  • the rate is 5% or more (more preferably 10% or more), and the crystal grain size of the magnesium alloy is 100 nm or more and 500 ⁇ m or less.
  • the average particle diameter of the hcp structure magnesium phase is 2 ⁇ m or more, and the average particle diameter of the long-period stacked structure phase is 0.2 ⁇ m or more.
  • the transition density of the hcp structure magnesium phase is one digit or more larger than the dislocation density of the portion other than the random grain boundary in the long-period stacked structure phase. At least a part of the long-period laminate structure phase is curved or bent.
  • the plastic workpiece may be at least one type of precipitate selected from the group consisting of Mg and rare earth element compounds, Mg and Zn compounds, Zn and rare earth element compounds, and Mg, Zn and rare earth element compounds. You may have a thing.
  • the total volume fraction of the precipitate is preferably more than 0% and 40% or less. Further, the plastic workpiece has hcp-Mg.
  • a heat treatment may be applied to the plastic workpiece after the magnesium alloy casting has been plastically processed.
  • the heat treatment conditions are preferably a temperature of 200 ° C. or higher and lower than 500 ° C., and a heat treatment time of 10 minutes to 1500 minutes (or 24 hours).
  • the reason why the heat treatment temperature is less than 500 ° C. is that when the temperature is 500 ° C. or more, the amount of strain applied by plastic working is canceled.
  • both Vickers hardness and yield strength rise compared with the plastic workpiece before performing heat processing are provided.
  • the plastic workpiece after the heat treatment also has a crystal structure of an hcp structure magnesium phase and a long period laminate structure phase at room temperature, and the volume fraction of the crystal grains having this long period laminate structure is 5 % Or more (more preferably 10% or more), the average particle diameter of the hcp structure magnesium phase is 2 ⁇ m or more, and the average particle diameter of the long-period laminated structure phase is 0.2 ⁇ m or more.
  • the average grain size of the crystal grains defined by the random grain boundaries is 0.05 ⁇ m or more.
  • the transition density of the hcp structure magnesium phase is one digit or more larger than the dislocation density of the portion other than the random grain boundary in the long-period stacked structure phase.
  • At least a part of the long-period laminate structure phase of the plastic workpiece after the heat treatment is curved or bent.
  • the plastic work product includes at least one kind of precipitation selected from a group consisting of a compound of Mg and a rare earth element, a compound of Mg and Zn, a compound of Zn and a rare earth element, and a compound of Mg, Zn and a rare earth element.
  • the total volume fraction of the precipitate is preferably more than 0% and 40% or less.
  • an atmosphere cost and environment that prevents combustion in the melting and casting process for producing a magnesium alloy having a mechanical property of high strength and high ductility by having a long-period laminated structure phase. It can be carried out in the air without an inert gas atmosphere).
  • the reason is that the ignition temperature of the magnesium alloy can be set to 800 ° C. or higher (preferably 850 ° C. or higher) by adding a small amount of Ca.
  • the addition amount of Ca is more than 0 atomic% and 0.5 atomic% or less (preferably 0.1 atomic% or more and 0.5 atomic% or less, more preferably 0.15 atomic% or more and 0.5 atomic% or less). .
  • the melting temperature of the magnesium alloy is close to the ignition temperature, so it is necessary to create an atmosphere that prevents combustion.
  • adding a small amount of Ca makes the ignition temperature higher than the melting temperature. This makes it possible to carry out melting and casting in air.
  • the magnesium alloy according to the present embodiment achieves flame retardancy by raising the ignition temperature, and conventional metal processing equipment may be used as it is, and fine powder and shavings generated during processing are not generated.
  • the magnesium alloy according to the present embodiment has a property that it can have high strength by having a long-period laminated structure phase and is difficult to burn during melting, casting, and processing. That is, it is possible to realize a magnesium alloy having both advantages of high strength and flame retardancy.
  • the application range of the magnesium alloy according to the present embodiment is diverse such as IT field (smartphone, notebook computer, etc.), medical field, automobile, aircraft, railway field. The composition range of the magnesium alloy according to this embodiment will be described. This is because the toughness (or ductility) tends to decrease particularly when the zinc content is 5 atomic% or more.
  • the range of the zinc content in the magnesium alloy of the present embodiment is the widest and is 0.5 atomic% or more and 5.0 atomic% or less.
  • the Mg—Zn—Y-based magnesium alloy of the present embodiment has a content in the range described above, but may contain impurities that do not affect the alloy characteristics.
  • the magnesium alloy according to the present embodiment may further contain Al at y atomic%, where y is the following (formula 5), preferably the following (formula 51), more preferably the following (formula 52) or (formula 53). More preferably, the following (Formula 54) or (Formula 55) may be satisfied.
  • y is the following (formula 5), preferably the following (formula 51), more preferably the following (formula 52) or (formula 53). More preferably, the following (Formula 54) or (Formula 55) may be satisfied.
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd, and c is the following ( It is preferable to satisfy (Expression 6) and (Expression 7), or (Expression 7) and (Expression 8).
  • Misch metal is a mixture or alloy of a plurality of rare earth elements mainly composed of Ce and La, and is a residue after refining and removing useful rare earth elements such as Sm and Nd from ore.
  • the composition depends on the composition of the ore before refining. The main reason for setting the upper limit of the content of La and the like to 2.0 atomic% is that there is almost no solid solubility limit of La and the like.
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atom%, where c is the following (formula 8) and It is preferable to satisfy (Equation 9).
  • (Formula 8) 0 ⁇ c ⁇ 3.0
  • (Formula 9) 0.2 ⁇ b + c ⁇ 6.0
  • the reason why the upper limit of the content of Yb or the like is set to 3.0 atomic% is that the solid solubility limit of Yb or the like is low.
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atom%, La, Ce, Pr, Eu, At least one element selected from the group consisting of Mm and Gd may be contained in total in d atomic%, and c and d satisfy the following (formula 6) to (formula 8), or (formula 8) And (Equation 9) should be satisfied.
  • the magnesium alloy according to the present embodiment includes Th, Si, Mn, Zr, Ti, Hf, Nb, Ag, Sr, Sc, B, C, Sn, Au, Ba, Ge, Bi, Ga, In, Ir. At least one element selected from the group consisting of Li, Pd, Sb and V may be contained in a total of more than 0 atomic% and not more than 2.5 atomic%. When Th or the like is added, other properties can be improved while maintaining high strength and high toughness.
  • this magnesium alloy casting suppresses precipitation of a compound such as Mg 3 Zn 3 RE 2 , Formation of the long-period laminated structure phase is promoted, and the crystal structure is refined. Therefore, this magnesium alloy casting can be easily subjected to plastic processing such as extrusion, and the plastic processed product subjected to plastic processing has a large amount of long-period laminated structure phase compared to the plastic processed product of magnesium alloy not added with Zr. It has a refined crystal structure. The strength and toughness can be improved by having a large amount of the long-period laminated structure phase.
  • ⁇ Embodiment 2> A method for producing a flame-retardant magnesium alloy according to one embodiment of the present invention will be described.
  • description of the same part as the manufacturing method of the flame-retardant magnesium alloy by Embodiment 1 is abbreviate
  • Zn containing a atomic%, Y containing b atomic%, Ca containing x atomic%, the balance being Mg, a, b and x are alloys satisfying the following (formula 1) to (formula 4) , Melt and cast at a temperature of 800 ° C. or lower (preferably 850 ° C. or lower).
  • This alloy has an ignition temperature of 800 ° C. or higher (preferably 850 ° C. or higher) by containing Ca. In this way, a magnesium alloy casting is produced.
  • This magnesium alloy casting what was cut out into a predetermined shape from an ingot is used.
  • (Formula 1) 0.25 ⁇ a ⁇ 5.0
  • (Formula 2) 0.5 ⁇ b ⁇ 5.0
  • (Formula 3) 0.5a ⁇ b
  • 4) 0 ⁇ x ⁇ 0.5 (preferably 0.1 ⁇ x ⁇ 0.5, more preferably 0.15 ⁇ x ⁇ 0.5)
  • a plurality of chip-shaped castings having a size of several mm square or less are produced by cutting the magnesium alloy casting.
  • the chip-shaped casting may then be preformed using compression or plastic working means and subjected to a homogenizing heat treatment.
  • the heat treatment conditions at this time are preferably a temperature of 400 ° C. to 550 ° C. and a treatment time of 1 minute to 1500 minutes (or 24 hours). Further, the preformed molded product may be subjected to heat treatment at a temperature of 150 ° C. to 450 ° C. for 1 minute to 1500 minutes (or 24 hours).
  • a chip-shaped casting is generally used as a raw material for, for example, a Chixso mold. Note that a mixture of a chip-shaped casting and ceramic particles may be preformed using compression or plastic working means and subjected to a homogenization heat treatment.
  • the chip-shaped casting is solidified by performing plastic working on the chip-shaped casting.
  • plastic working method various methods can be used as in the case of the first embodiment.
  • mechanical processing such as ball mill, stamp mill, high energy ball mill, or bulk mechanical alloying may be added.
  • plastic processing or blast processing may be further added.
  • the magnesium alloy casting may be compounded with intermetallic compound particles, ceramic particles, fibers, or the like, or the cut material may be mixed with ceramic particles, fibers, or the like.
  • the plastic workpiece subjected to plastic working in this way has a crystal structure of an hcp-structure magnesium phase and a long-period laminate structure phase at room temperature. At least a part of the long-period laminated structure phase is curved or bent.
  • the total amount of strain when plastic processing is performed on the chip-shaped casting is preferably 15 or less, and more preferably 10 or less. Moreover, it is preferable that the amount of strain per time when the plastic working is performed is 0.002 or more and 4.6 or less.
  • the total strain amount here is a total strain amount that is not canceled by a heat treatment such as annealing, and means a total strain amount when plastic processing is performed after preforming a chip-shaped casting.
  • the strain canceled by heat treatment during the manufacturing process is not counted as the total strain amount, and the strain amount until the chip-shaped casting is preformed is not counted as the total strain amount.
  • a heat treatment may be applied to the plastic workpiece after the chip-shaped casting has been plastically processed.
  • the heat treatment conditions are preferably a temperature of 200 ° C. or higher and lower than 500 ° C., and a heat treatment time of 10 minutes to 1500 minutes (or 24 hours). The reason why the heat treatment temperature is less than 500 ° C.
  • the plastic workpiece after the heat treatment also has a crystal structure of the hcp structure magnesium phase and the long-period laminated structure phase at room temperature, as before the heat treatment. At least a part of the long-period laminated structure phase is curved or bent. Also in the present embodiment, the same effect as in the first embodiment can be obtained.
  • the structure is refined by producing the chip-shaped cast by cutting the cast, so that the strength, the high ductility, and the high are higher than those in the first embodiment. It becomes possible to produce a tough plastic workpiece.
  • the magnesium alloy according to the present embodiment can obtain characteristics of high strength and high toughness even when the concentration of zinc and rare earth elements is lower than that of the magnesium alloy according to the first embodiment. Further, when the zinc content is less than 0.25 atomic% or the Y content is less than 0.5 atomic%, at least one of strength and toughness becomes insufficient. Therefore, the lower limit of the zinc content is 0.25 atomic%, and the lower limit of the total rare earth element content is 0.5 atomic%.
  • the Mg—Zn—Y-based magnesium alloy of the present embodiment has a content in the above-described range, but may contain impurities that do not affect the alloy characteristics.
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of La, Ce, Pr, Eu, Mm, and Gd, and c is the following ( It is preferable to satisfy Expression 6) and Expression 7.
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atom%, where c is the following (formula 8) and It is preferable to satisfy (Equation 9).
  • the magnesium alloy according to the present embodiment may contain a total of at least one element selected from the group consisting of Yb, Tb, Sm, and Nd, c atom%, La, Ce, Pr, Eu, At least one element selected from the group consisting of Mm and Gd may be contained in total at d atomic%, and c and d preferably satisfy the following (formula 6) to (formula 8).
  • (Formula 6) 0 ⁇ c ⁇ 3.0
  • Formula 7) 0 ⁇ d ⁇ 3.0
  • Magnesium alloy ingots having these alloy components are melted in an air atmosphere using a high-frequency melting furnace and cut into a shape of ⁇ 32 ⁇ 70 mm from these ingots to produce a cast material. These cast materials were extruded under conditions of a temperature of 350 ° C., an extrusion ratio of 10, and an extrusion speed of 2.5 mm / second.
  • the Ca content was 0.15 to 0.6 at% and the ignition temperature of the magnesium alloy was 850 ° C. or higher.
  • an ignition temperature of 800 ° C. or more can be expected.
  • the ignition temperature of a composition to which Ca is not added is about 775 ° C.
  • this ignition temperature is the melting and casting of this alloy. It is close to 750 ° C. which is the temperature of the hour. For this reason, when this alloy is melted, an atmosphere of an inert gas is required.
  • the ignition temperature is 800 ° C. or higher or 850 ° C. or higher as in the sample of this example, it is sufficiently higher than the melting point of the alloy, so that it is possible to perform melt processing without using an inert gas. Become.
  • the addition range of Ca having an ignition temperature of 800 ° C. or higher or 850 ° C. or higher while having excellent mechanical properties of the long-period laminated magnesium alloy is More than 0 at% and 0.5 at% or less (preferably 0.1 to 0.5 at%).
  • Magnesium alloy ingots having these alloy components are melted in an Ar atmosphere using a high-frequency melting furnace and cut into a shape of ⁇ 32 ⁇ 70 mm from these ingots to produce a cast material. These cast materials were extruded under conditions of a temperature of 350 ° C., an extrusion ratio of 10, and an extrusion speed of 2.5 mm / second.
  • Magnesium alloy ingots having these alloy components are melted in an air atmosphere using a high-frequency melting furnace and cut into a shape of ⁇ 32 ⁇ 70 mm from these ingots to produce a cast material.
  • These cast materials were extruded under conditions of a temperature of 350 ° C., an extrusion ratio of 10, and an extrusion speed of 2.5 mm / second. (Measurement of ignition temperature)
  • the ignition temperature of the cast material was measured.
  • the measurement method is as follows. After processing the ingot of the cast material into a chip shape with a lathe, 0.5 g of a chip of a certain size was placed in an electric furnace, and the ignition temperature was measured under heating (100 K / min). The measurement results are shown in Table 1. According to Table 1, the ignition temperature of the magnesium alloy could be increased by containing Ca.

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EP14785713.0A EP2987875B1 (de) 2013-04-15 2014-04-14 Feuerfeste magnesiumlegierung und herstellungsverfahren dafür
US14/784,066 US20160068933A1 (en) 2013-04-15 2014-04-14 Flame-retardant magnesium alloy and method of manufacturing same
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CN108300920B (zh) * 2018-02-09 2019-08-09 河南科技大学 一种高强度阻燃镁合金及其制备方法
JP7362052B2 (ja) * 2018-02-28 2023-10-17 国立大学法人 熊本大学 難燃性マグネシウム合金及びその製造方法
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CN110438380B (zh) * 2019-08-13 2021-02-26 中南大学 一种耐热阻燃镁合金及其形变热处理方法
CN115398017B (zh) * 2020-02-07 2024-05-14 株式会社镁州港 镁合金及其制造方法
CN111394632B (zh) * 2020-05-07 2021-07-02 中国科学院长春应用化学研究所 一种钆钐稀土镁合金及其制备方法
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CN112981203B (zh) * 2021-02-23 2021-11-12 吉林大学 一种耐腐蚀高强韧镁合金及其制备方法
CN113373398B (zh) * 2021-06-24 2023-04-28 重庆大学 一种阻燃镁合金部件
CN115449682B (zh) * 2022-09-28 2024-04-26 广东汇天航空航天科技有限公司 一种稀土与碱土元素复合的镁基合金及其制备方法

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JPWO2014171549A1 (ja) 2017-02-23
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CN105408508A (zh) 2016-03-16
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JPWO2014171550A1 (ja) 2017-02-23
KR101863573B1 (ko) 2018-06-01
JPWO2014171548A1 (ja) 2017-02-23
US20160068933A1 (en) 2016-03-10
WO2014171548A1 (ja) 2014-10-23
KR20150140829A (ko) 2015-12-16
EP2987875A1 (de) 2016-02-24
WO2014171550A1 (ja) 2014-10-23
EP2987875B1 (de) 2018-10-10
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CN105283566A (zh) 2016-01-27
US20160168666A1 (en) 2016-06-16

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