WO2023090127A1 - 合金、合金部材、機器及び合金の製造方法 - Google Patents

合金、合金部材、機器及び合金の製造方法 Download PDF

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WO2023090127A1
WO2023090127A1 PCT/JP2022/040375 JP2022040375W WO2023090127A1 WO 2023090127 A1 WO2023090127 A1 WO 2023090127A1 JP 2022040375 W JP2022040375 W JP 2022040375W WO 2023090127 A1 WO2023090127 A1 WO 2023090127A1
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alloy
mass
content
less
phase
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English (en)
French (fr)
Japanese (ja)
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慶一 石塚
淳一 坂本
広与 田宮
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Canon Inc
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Canon Inc
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Priority to EP22895410.3A priority Critical patent/EP4435126A4/en
Priority to CN202280075674.0A priority patent/CN118234881A/zh
Publication of WO2023090127A1 publication Critical patent/WO2023090127A1/ja
Priority to US18/652,667 priority patent/US20240279781A1/en
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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
    • 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
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Definitions

  • the present disclosure relates to Mg-Li alloys, alloy members, devices, and methods of manufacturing alloy members.
  • Patent Document 1 discloses a magnesium-lithium alloy in which the content of lithium is in the range of 8% by mass or more and 11% by mass or less.
  • a first aspect for solving the above problems is an alloy containing Mg and Li, wherein the sum of the Mg content and the Li content is 90% by mass or more, and the Li content is in the range of more than 11% by mass and 13.5% by mass or less, the alloy contains one or more elements selected from the first group consisting of Ge, Mn and Si, and the alloy contains at 25 ° C.
  • a second aspect for solving the above problems is an alloy containing Mg and Li, wherein the sum of the Mg content and the Li content is 90% by mass or more, and the Li content of the alloy is The content is in the range of 5.34% by mass or more and 11% by mass or less, the alloy contains one or more elements selected from the first group consisting of Ge, Mn and Si, and the temperature of the alloy at 25 ° C.
  • the alloy is characterized by satisfying y>0.3736x 2 ⁇ 24.053x+217.79, where y (%) is the proportion of ⁇ phase at temperature and x (mass %) is the content of Li.
  • a third aspect for solving the above problems contains Mg and Li, contains one or more elements selected from the first group consisting of Ge, Mn and Si, the Mg content and the Li
  • the present disclosure it is possible to provide a magnesium-lithium alloy that contains an ⁇ phase even if the Li content is more than 11% by mass, and that is lightweight and has excellent corrosion resistance.
  • the Li content is in the range of 5.34% by mass or more and 11% by mass or less, it is possible to provide a magnesium-lithium alloy with a higher ⁇ -phase content than conventional alloys, which is lightweight and excellent in corrosion resistance.
  • FIG. 1 is a schematic diagram of an alloy member according to a first embodiment;
  • FIG. It is a schematic diagram of the apparatus concerning a 3rd embodiment. It is a schematic diagram of the equipment concerning a 4th embodiment. It is a schematic diagram of the apparatus concerning a 5th embodiment.
  • FIG. 4 is a diagram showing the results of 2 ⁇ - ⁇ measurement in Example 1-1; It is a figure which shows the abundance ratio of the (alpha) phase of an Example.
  • FIG. 1 is a schematic diagram of the alloy member according to the first embodiment, and is a cross-sectional view cut in the lamination direction.
  • the alloy member 100 is a magnesium-lithium alloy member (Mg-Li alloy member).
  • the alloy member includes a base material 102 and a coating 101 provided on the base material 102 .
  • the film 101 is provided to protect the first surface 102A of the substrate, and can be made of, for example, a material containing magnesium phosphate or magnesium fluoride. Further, a coating film such as a primer or a topcoat layer may be provided on the film 101 according to the purpose of the user. Examples of the coating film include a heat shielding film having a heat shielding function. However, depending on the purpose of use, the film 101 may be omitted. Therefore, in the present disclosure, the aspect without the coating 101 is also referred to as the Mg—Li alloy member.
  • the shape of the base material 102 is not particularly limited as long as it has the first surface 102A.
  • the shape is not limited to the hexahedron such as the rectangular parallelepiped and the cube shown in FIG. Also, since the first surface 102A is an arbitrary surface, its location is not particularly limited.
  • the base material 102 contains a magnesium-lithium alloy (Mg-Li alloy).
  • Mg—Li alloy refers to an alloy containing Mg and Li, and the sum of the Mg content and the Li content is 90% by mass or more.
  • the specific gravity can be easily made 1.60 or less.
  • Mg—Li alloys are lightweight metal materials, and are superior in light weight, vibration damping properties, and specific strength as compared to Li-free Mg alloys. Being excellent in damping means quickly converging vibration by quickly converting vibration energy into thermal energy. Further, the specific strength is the tensile strength per density, and the higher the specific strength, the lighter the member.
  • the specific gravity exceeds 1.60, making it difficult to reduce the weight.
  • a more preferable specific gravity is 1.50 or less.
  • Mg-Li alloys have different crystal structures depending on the Li content.
  • the structure is based on the phase diagram described in the document ""Binary alloy phase diagram collection", edited by Seizo Nagasaki and Makoto Hirabayashi, publisher: Agne Technical Center, ISBN-13: 978-4900041882, release date: 2001/01"
  • the Mg—Li alloy has a single-phase region of ⁇ phase, a single-phase region of ⁇ -phase, and a eutectic region having both ⁇ -phase and ⁇ -phase.
  • the ⁇ phase is rich in Mg and is also called a hexagonal close-packed phase, and its crystal structure is a hexagonal close-packed (hcp) structure.
  • the ⁇ phase is rich in Li and is also called a body-centered cubic phase, and its crystal The structure is a bcc (Body-Centered Cubic) structure. If the Li content is lower than 5.34% by mass at 25° C., only the ⁇ phase is present.Also, at 25° C., Li is 5.34 mass%. % or more and 11% by mass or less, a mixed phase of ⁇ phase and ⁇ phase occurs, and when Li exceeds 11% by mass at 25° C., only ⁇ phase occurs.
  • the Mg-Li alloy becomes lighter as the Li content increases, it is desirable to increase the Li content.
  • the conventional Mg—Li alloy is a ⁇ -phase single phase with a Li content of 11% by mass or more, it will rapidly corrode simply by being left in an environment at room temperature (for example, 25° C.) for a long time. There was a problem. Therefore, it has been necessary to improve the corrosion resistance of Mg—Li alloys.
  • the specific element to be contained in the Mg-Li alloy is one or more elements selected from the first group consisting of Ge, Mn and Si. Although the detailed mechanism has not been completely elucidated, from the experimental results including the examples described later, it is believed that these first group elements play a role in generating the ⁇ phase.
  • the content of Ge in the Mg-Li alloy is preferably 0.3% by mass or less.
  • the corrosion resistance is particularly good.
  • the Ge content exceeds 0.3% by mass, Ge oxide may segregate at the grain boundaries of the Mg—Li alloy.
  • the Ge content is more preferably in the range of 0.01% by mass or more and 0.1% by mass or less.
  • the content of Mn in the Mg--Li alloy is preferably 2% by mass or less.
  • the toughness is good.
  • the corrosion resistance may become comparable to that when Mn is not contained.
  • a more preferable Mn content is 1.5% by mass or less.
  • a more preferable Mn content is in the range of 0.1% by mass or more and 1.1% by mass or less.
  • the content of Si in the Mg--Li alloy is preferably 0.5% by mass or less.
  • the corrosion resistance is particularly good.
  • the Si content exceeds 0.5% by mass, the corrosion resistance may be comparable to that when Si is not contained.
  • a more preferable Si content is less than 0.1% by mass.
  • a more preferable Si content is in the range of 0.01% by mass or more and 0.03% by mass or less.
  • the Mg--Li alloy of the first embodiment preferably contains two or more elements of the first group from the viewpoint of facilitating the formation of the ⁇ -phase. More preferably, all three types are contained. Also, from the same point of view, it is preferable that the content of Ge is the largest among these three types. Also, from the same point of view, it is preferable that the content of Si is the smallest among these three types.
  • the content of Li in the Mg—Li alloy is in the range of more than 11% by mass and 13.5% by mass or less.
  • one or more elements selected from the first group and the raw material of the Mg—Li-based alloy having the above Li content are melt-synthesized, and during subsequent cooling, after the molten raw material starts to solidify The cooling rate to 100°C, which is just below the recrystallization temperature, is set to 100°C/min or less. Through such a process, a Mg--Li alloy having an ⁇ phase at 25.degree. C. can be obtained.
  • the cooling rate is more preferably 50° C./min or less, and still more preferably 25° C./min or less.
  • the obtained Mg—Li-based alloy of the first embodiment has an ⁇ phase at 25° C. in spite of a relatively large composition range in which the Li content is more than 11% by mass and 13.5% by mass or less. Corrosion can be suppressed more than
  • the ratio of the ⁇ phase in the Mg—Li alloy of the first embodiment at 25°C is preferably 8% or more.
  • the corrosion resistance is particularly good.
  • a more preferable ⁇ -phase ratio is 20% or more, and a further preferable ⁇ -phase ratio is 30% or more.
  • the abundance ratio of the ⁇ phase can be measured by the X-ray diffraction method. Specifically, for example, it is possible to measure by the following procedure. First, a diffraction pattern is obtained by the 2 ⁇ - ⁇ method in the range of 20° to 100° with respect to the Mg--Li alloy, and the background is removed. Next, each peak of the diffraction pattern from which the background has been removed is divided into an ⁇ -phase-derived peak and a ⁇ -phase-derived peak.
  • the Mg--Li alloy of the first embodiment preferably further contains one or more elements selected from the second group consisting of Al, Zn, Zr, Ca and Be.
  • These elements of the second group are elements that the inventor has confirmed experimentally that even if they exist in the Mg--Li alloy, they hardly inhibit the formation of the ⁇ -phase.
  • the sum of the contents of one or more elements selected from the second group is preferably 0.01% by mass or more and 7% by mass or less. When the sum of the contents of the one or more elements selected from the second group is within the above range, at least one of corrosion resistance, fracture strength, ductility and toughness will be good.
  • the content of Al in the Mg-Li alloy is preferably 5% by mass or less.
  • the breaking strength is good.
  • the content of Al exceeds 5% by mass, the process window becomes narrow, although the mechanism is unknown, and there is a possibility that the effect of generating the ⁇ phase by the elements of the first group is inhibited.
  • a more preferable Al content is in the range of 0.1% by mass or more and 4% by mass or less.
  • the content of Zn in the Mg-Li alloy is preferably 2% by mass or less.
  • the Zn content is 2% by mass or less, good ductility is achieved.
  • the Zn content exceeds 2% by mass, the process window is narrowed, although the mechanism is unknown, and there is a risk of inhibiting the effect of the first group elements to generate the ⁇ phase.
  • a more preferable Zn content is 0.1% by mass or more and 1% by mass or less.
  • the content of Zr in the Mg-Li alloy is preferably 0.7% by mass or less.
  • the toughness is good.
  • the toughness may be approximately the same as when Zr is not contained.
  • a more preferable Zr content is in the range of 0.1% by mass and 0.5% by mass or less.
  • the content of Ca in the Mg-Li alloy is preferably 0.3% by mass or less.
  • the content of Ca in the Mg-Li alloy is preferably 0.3% by mass or less.
  • the content of Ca is 0.3% by mass or less, good corrosion resistance is achieved.
  • the content of Ca exceeds 0.3% by mass, the corrosion resistance may become comparable to that when Ca is not contained.
  • a more preferable Ca content is in the range of 0.01% by mass or more and 0.15% by mass or less.
  • the content of Be in the Mg-Li alloy is preferably 0.1% by mass or less.
  • the toughness is good.
  • the Be content exceeds 0.1% by mass, the toughness may be about the same as when Be is not included.
  • a more preferable Be content is in the range of 0.01% by mass or more and 0.05% by mass or less.
  • the Mg—Li alloy of the first embodiment may contain metal elements other than the elements exemplified above within a range in which the characteristics do not change.
  • These metal elements include unavoidable impurities that cannot be avoided during manufacturing. Examples of unavoidable impurities include Fe and Cu.
  • the content of unavoidable impurities in the Mg—Li alloy is 1% by mass or less.
  • the Mg--Li alloy of the first embodiment has an ⁇ -phase even if the Li content is more than 11% by mass at 25°C, so it is lightweight and excellent in corrosion resistance.
  • the method for producing a Mg—Li alloy according to the first embodiment includes means for melting and synthesizing raw materials, and then cooling the molten raw materials at a cooling rate of 100° C./min or less from when the molten raw materials begin to solidify to 100° C. It is not particularly limited as long as it has. An example of a preferable manufacturing method is described below.
  • the raw materials for the Mg-Li alloy are prepared (preparation process). Specifically, it contains Mg, Li, and one or more elements selected from the first group consisting of Ge, Mn and Si so as to have a desired composition, and the content of Mg and the content of Li A raw material having a sum of 90% by mass or more is prepared. At this time, the content of Li is more than 11% by mass and 13.5% by mass or less.
  • the purity of the raw material is, for example, 4N, and commercially available high-purity metals can be used.
  • the form of the metal is not particularly limited, and a desired form can be selected from, for example, ingots, chips, flakes, powders, shots and pellets.
  • the metal not only a single metal element but also an alloy composed of a plurality of metal elements may be used. At this time, if necessary, raw materials of one or more elements selected from the second group consisting of Al, Zn, Zr, Ca and Be may be prepared.
  • these raw materials are heated and melted (heating process). Specifically, these raw materials are placed in a crucible and heated to 600° C. or higher to melt.
  • the temperature should be the melting point or higher of these raw materials, preferably 700° C. or higher. More preferably, it is 800° C. or higher.
  • the means for heating is not particularly limited, for example, high-frequency induction heating and electromagnetic induction stirring can be employed.
  • the atmosphere during heating is preferably an inert atmosphere, for example, an argon gas atmosphere, in order to prevent oxidation of the alloy.
  • the heating rate to the melting temperature is not particularly limited.
  • the temperature may be held for a certain period of time during heating and melting, but the holding time can be appropriately selected depending on the desired shape.
  • the molten raw material is cooled and solidified (cooling process).
  • the cooling rate is controlled so that the cooling rate from the start of solidification of the molten raw material to 100° C. just below the recrystallization temperature is 100° C./min or less.
  • the cooling rate described above is the average cooling rate when the molten raw material is cooled to 100° C. just below the recrystallization temperature after starting to solidify.
  • a more preferable cooling rate in the cooling step is 50°C/min or less, and a further preferable cooling rate is 25°C/min or less.
  • the cooling rate at 200°C or lower is preferably slower than the cooling rate at temperatures higher than 200°C.
  • the obtained Mg-Li alloy may be machined to have a desired shape. Machining is appropriately selected from lapping, cutting, barrel polishing, etc., as required. Also, the obtained Mg—Li alloy may be washed. In the cleaning, it is possible to remove metal scraps, dust, oil stains, deteriorated layers, etc. due to machining such as cutting. Therefore, it is possible to use general cleaning methods such as cleaning with an acid or alkali, cleaning using a surfactant, brush cleaning, and ultrasonic cleaning. After washing, drying may be performed as necessary.
  • the obtained Mg--Li alloy may be used as a base material and a coating may be provided on the base material.
  • the means for providing the coating is not particularly limited, and can be appropriately selected depending on the coating to be provided. If the coating is magnesium fluoride, a known anodizing process or chemical conversion treatment using a known treatment solution can be used. Further, when the film is magnesium phosphate, chemical conversion treatment using a known treatment liquid can be used.
  • the Mg—Li alloy of the second embodiment differs from the first embodiment in the Li content.
  • the Mg—Li alloy of the second embodiment will be described below, focusing on the differences from the first embodiment.
  • the content of Li in the Mg—Li alloy is in the range of 5.34% by mass or more and 11% by mass or less.
  • one or more elements selected from the first group and the raw material of the Mg—Li-based alloy having the above Li content are melt synthesized, and during subsequent cooling, the molten raw material starts to solidify to 100 ° C.
  • the cooling rate of is set to 100°C/min or less.
  • the cooling rate is more preferably 50° C./min or less, and still more preferably 25° C./min or less.
  • the obtained Mg—Li-based alloy of the second embodiment has more ⁇ -phase than before in the composition region where the Li content is 5.34% by mass or more and 11% by mass or less, so corrosion can be further suppressed. can.
  • the Li concentration in the equilibrium state at 25° C. is 16.5 atomic % (5 .34% by mass).
  • the formation of the ⁇ phase begins.
  • the existence ratio of the ⁇ phase in the equilibrium state at 25° C. is 100%.
  • the Li concentration in the equilibrium state at 25 ° C. is 30.0 atomic % (10.9 mass %).
  • Li is added to Mg at a concentration higher than this concentration, the ⁇ -phase disappears and only the ⁇ -phase is formed. That is, the existence ratio of the ⁇ phase becomes 0% at this concentration or higher.
  • the intermediate Li concentration between the two Li concentrations read above is 7.96% by mass, and the existence ratio of the ⁇ phase in the equilibrium state at 25° C. at this concentration is 50%.
  • this curve represents the abundance ratio of the ⁇ phase in the equilibrium state of Li concentration and 25°C in the conventional Mg-Li alloy.
  • the Mg—Li-based alloy of the second embodiment is characterized by satisfying the following formula (2), where y is the abundance ratio of the ⁇ phase and x is the mass % of Li. y>0.3736x 2 ⁇ 24.053x+217.79 (2)
  • the Mg—Li-based alloy of the second embodiment has more ⁇ -phases than before in the composition region where the Li content is 5.34% by mass or more and 11% by mass or less, so corrosion can be further suppressed. .
  • the manufacturing method of the Mg—Li alloy member of the second embodiment differs from the first embodiment in the preparation process.
  • a method of manufacturing an Mg--Li alloy member according to the second embodiment will be described below, focusing on the differences from the first embodiment.
  • the preparation process for preparing the raw material for the Mg-Li alloy will be explained. Specifically, it contains Mg, Li, and one or more elements selected from the first group consisting of Ge, Mn and Si so as to have a desired composition, and the content of Mg and the content of Li A raw material having a sum of 90% by mass or more is prepared. At this time, the content of Li is 5.34% by mass or more and 11% by mass or less.
  • the purity of the raw material is, for example, 4N, and commercially available high-purity metals can be used.
  • the form of the metal is not particularly limited, and a desired form can be selected from, for example, ingots, chips, flakes, powders, shots and pellets.
  • the metal not only a single metal element but also an alloy composed of a plurality of metal elements may be used. At this time, if necessary, raw materials of one or more elements selected from the second group consisting of Al, Zn, Zr, Ca and Be may be prepared.
  • the cooling process for cooling and solidifying the molten raw material will be explained. Specifically, similarly to the first embodiment, the cooling rate is controlled so that the cooling rate from the start of solidification of the molten raw material to 100° C. is 100° C./min or less. Through the above steps, the Mg—Li alloy of the second embodiment can be obtained.
  • a more preferable cooling rate in the cooling step is 50°C/min or less, and a further preferable cooling rate is 25°C/min or less.
  • FIG. 2 shows the configuration of a single-lens reflex digital camera 600, which is an imaging device as an example of the device according to the third embodiment of the present disclosure.
  • a camera body 602 and a lens barrel 601, which is an optical device, are combined.
  • Lens 603 and 605 are examples of components arranged on the optical axis of the imaging optical system in the housing of the lens barrel 601, and is received by the imaging device. It is taken by Here, the lens 605 is supported by an inner cylinder 604 and movably supported with respect to the outer cylinder of the lens barrel 601 for focusing and zooming.
  • a main mirror 607 which is an example of a component inside a housing 621 of the camera body, and after passing through a prism 611, the photographed image is displayed to the photographer through a finder lens 612.
  • the main mirror 607 is, for example, a half mirror, and light transmitted through the main mirror is reflected by a sub-mirror 608 toward an AF (autofocus) unit 613. This reflected light is used for distance measurement, for example.
  • the main mirror 607 is attached to and supported by a main mirror holder 640 by adhesion or the like.
  • the main mirror 607 and the sub-mirror 608 are moved out of the optical path via a drive mechanism (not shown), the shutter 609 is opened, and the photographed light image incident from the lens barrel 601 is formed on the image sensor 610 .
  • the diaphragm 606 is configured to change the brightness and the depth of focus at the time of shooting by changing the aperture area.
  • the alloy member 100 can be used for at least part of the housings 620 and 621.
  • the housings 620 and 621 may be composed only of the Mg—Li alloy member, or the alloy member 100 may be provided with a coating film. Since the Mg—Li alloy of the present disclosure is lightweight and excellent in corrosion resistance, it is possible to provide an imaging device that is lighter in weight and superior in corrosion resistance than conventional imaging devices.
  • the imaging device has been described using a single-lens reflex digital camera as an example, the present disclosure is not limited to this, and may be a smartphone or a compact digital camera.
  • FIG. 3 shows the configuration of a personal computer, which is an electronic device that is an example of the device according to the fourth embodiment of the present disclosure.
  • a personal computer 800 has a display section 801 and a main body section 802 .
  • An electronic component 830 which is an example of a component provided in the housing, is provided inside the housing 820 of the main body 802.
  • the alloy member 100 can be used for at least part of the housing 820 of the main body 802 .
  • the housing 820 may be composed only of the Mg—Li alloy member, or the alloy member 100 may be provided with a coating film. Since the Mg—Li alloy of the present disclosure is lightweight and excellent in corrosion resistance, it is possible to provide a personal computer that is lighter in weight and more excellent in corrosion resistance than conventional personal computers.
  • the electronic device has been described using the personal computer 800 as an example, the present disclosure is not limited to this, and may be a smartphone or tablet.
  • FIG. 4 is a drone, which is an example of a moving object according to the fifth embodiment of the present disclosure.
  • the drone 700 includes a plurality of drive units 701 and a body unit 702 connected to the drive units 701 .
  • a driving circuit (not shown), which is an example of a component, is provided in the main body 702 .
  • the drive unit 701 has, for example, a propeller.
  • a leg portion 703 may be connected to the body portion 702, or a configuration in which a camera 704 is connected may be employed.
  • the alloy member 100 can be used for at least a portion of the housing 710 of the body portion 702 and the leg portion 703 .
  • the housing 710 may be composed only of the Mg—Li alloy member, or the alloy member 100 may be provided with a coating film. Since the Mg—Li-based alloy of the present disclosure is excellent in damping properties and corrosion resistance, it is possible to provide drones that are superior in damping properties and corrosion resistance to conventional drones.
  • the drone 700 is used as an example to describe the moving object, the present disclosure is not limited to this, and may be an automobile or an aircraft.
  • each peak of the diffraction pattern from which the background was removed was divided into an ⁇ -phase-derived peak and a ⁇ -phase-derived peak.
  • cps Counteridium Count per Second
  • a sample was used, which was obtained by cutting the manufactured cylindrical billet of ⁇ 60 mm into a plate shape of 20 mm ⁇ 50 mm ⁇ 2 mm.
  • the specific gravity was measured by the Archimedes method. Specifically, a cylinder of ⁇ 10 mm ⁇ 10 mm was produced from the produced billet, and the column was immersed in water for measurement. The same sample was measured three times, and the average value was used as the specific gravity value.
  • a plate-shaped sample was prepared by cutting the produced cylindrical billet of ⁇ 60 mm in the thickness direction of 15 mm perpendicularly to the length direction. The plate-like sample was left in the atmosphere at 25°C ⁇ 2°C for 3 months. After standing, it was visually observed to confirm whether or not the initial metallic color was maintained. A was given when the metallic color was maintained on the entire surface, B and C were given when at least part of the metallic color was maintained, and D was given when the metallic color could not be maintained.
  • Example 1-1 the composition is Mg-11.5% Li-0.25% Ge-3.4% Al-0.18% Mn-0.04% Be-0.02% Si A metal piece of each element with a purity of 4N was prepared.
  • FIG. 5 is a diagram showing the results of 2 ⁇ - ⁇ measurement in Example 1-1.
  • Example 1-2 differs from Example 1-1 in composition.
  • the composition of Example 1-2 is Mg-12.3% Li-0.29% Ge-2.9% Al-0.09% Mn-0.023% Si-0.15% Ca. Otherwise, the alloy member of Example 1-2 was obtained in the same manner as in Example 1-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 1-2 was 22.2%. Moreover, the specific gravity was 1.43. In addition, in the corrosion resistance measurement, the evaluation was set to A because the metallic color was maintained.
  • Example 1-3 differs from Example 1-1 in composition.
  • the composition of Example 1-3 is Mg-11.0% Li-2.2% Al-1.0% Zn-1.1% Mn-0.015% Si.
  • an alloy member of Example 1-3 was obtained in the same manner as in Example 1-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 1-3 was 30.8%. Moreover, the specific gravity was 1.42. In addition, in the corrosion resistance measurement, the evaluation was set to A because the metallic color was maintained.
  • Example 1-4 differs from Example 1-1 in composition.
  • the composition of Examples 1-4 is Mg-11.9% Li-3.9% Al-1.0% Zn-0.006% Mn-0.01% Si. Otherwise, the alloy member of Example 1-4 was obtained in the same manner as in Example 1-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 1-4 was 2.7%. Moreover, the specific gravity was 1.45. Also, in the corrosion resistance measurement, the evaluation was set to C because a change to black was partially confirmed.
  • Example 1-5 differs from Example 1-1 in composition.
  • the composition of Examples 1-5 is Mg-12.2% Li-3.0% Zn-0.41% Zr-0.01% Si. Otherwise, an alloy member of Example 1-5 was obtained in the same manner as in Example 1-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 1-5 was 8.1%. Moreover, the specific gravity was 1.45. Also, in the corrosion resistance measurement, a slight change to black was confirmed, so the evaluation was set to B.
  • Example 1-6 differs from Example 1-1 in composition.
  • the composition of Examples 1-6 is Mg-13.45% Li-5.54% Al-0.41% Ca-0.3% Mn. Otherwise, an alloy member of Example 1-6 was obtained in the same manner as in Example 1-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 1-6 was 3.4%. Moreover, the specific gravity was 1.40. Also, in the corrosion resistance measurement, the evaluation was set to C because a change to black was partially confirmed.
  • each element with a purity of 4N which is a raw material, so that the composition is Mg-8.9% Li-3.9% Al-0.8% Zn-0.02% Mn-0.19% Si of metal pieces were prepared.
  • Example 2-2 differs from Example 2-1 in composition.
  • the composition of Example 2-2 is Mg-9.0% Li-4.1% Al-1.1% Zn-0.009% Mn-0.015% Si. Otherwise, an alloy member of Example 2-2 was obtained in the same manner as in Example 2-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 2-2 was 47.0%. Moreover, the specific gravity was 1.52. In addition, in the corrosion resistance measurement, the evaluation was set to A because the metallic color was maintained.
  • Example 2-3 differs in composition from Example 2-1.
  • the composition of Example 2-3 is Mg-7.0% Li-6.9% Al-0.8% Zn-0.015% Si. Otherwise, an alloy member of Example 2-3 was obtained in the same manner as in Example 2-1.
  • the abundance ratio of the ⁇ phase in the alloy member of Example 2-3 was 98.7%. Moreover, the specific gravity was 1.60. In addition, in the corrosion resistance measurement, the evaluation was set to A because the metallic color was maintained.
  • FIG. 6 is a graph showing the Li concentration on the horizontal axis and the abundance ratio of the ⁇ phase on the vertical axis in the example.
  • the alloy members of Examples 1-1 to 1-6 in which the Li content is in the range of more than 11% by mass and 13.5% by mass or less, all have an ⁇ phase at 25 ° C. Corrosion resistance was as good as A or B.
  • Examples 1-1 to 1-3 in which the abundance ratio of the ⁇ -phase was 20% or more, had a particularly good corrosion resistance of A.
  • the specific gravities of the alloy members of Examples 1-1 to 1-6 were all less than 1.50, and they were particularly lightweight.
  • the alloy members of Examples 2-1 to 2-3 in which the Li content was in the range of 5.34% by mass or more and 11% by mass or less, had particularly good corrosion resistance of A.
  • the ratio of the ⁇ phase at 25° C. satisfied the relationship of formula (2) y>0.3736x 2 -24.053x+217.79.
  • the specific gravities of the alloy members of Examples 2-1 to 2-3 were all 1.60 or less, which were higher than those of Examples 1-1 to 1-6, but were light in weight.
  • alloy member 101 coating 102 base material 600 single-lens reflex digital camera (equipment) 601 lens barrel (equipment) 700 drone (equipment) 800 personal computer (equipment)

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