WO2022211062A1 - Matériau d'alliage d'aluminium, son procédé de production et composant de machine - Google Patents

Matériau d'alliage d'aluminium, son procédé de production et composant de machine Download PDF

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WO2022211062A1
WO2022211062A1 PCT/JP2022/016719 JP2022016719W WO2022211062A1 WO 2022211062 A1 WO2022211062 A1 WO 2022211062A1 JP 2022016719 W JP2022016719 W JP 2022016719W WO 2022211062 A1 WO2022211062 A1 WO 2022211062A1
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atomic
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aluminum alloy
alloy material
content
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Japanese (ja)
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雅晶 近藤
知平 杉山
尚記 ▲高▼田
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株式会社豊田自動織機
国立大学法人東海国立大学機構
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc 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

Definitions

  • the present invention relates to an aluminum alloy material, a method for manufacturing the same, and a machine part made of the aluminum alloy material.
  • Aluminum alloy is used as a material for machine parts, taking advantage of its high specific strength.
  • compressor parts for transportation machines such as impellers incorporated in turbochargers are required to have excellent mechanical properties at high temperatures.
  • Non-Patent Document 1 describes that Al-Mg-Zn ternary alloys have excellent strength at high temperatures (Non-Patent Document 1).
  • Non-Patent Document 1 still has room for improvement in creep properties.
  • the present invention has been made in view of this background, and aims to provide an aluminum alloy material with excellent creep properties, a method for producing the same, and a machine part.
  • One aspect of the present invention is Mg (magnesium): 1.0 atomic % to 10.0 atomic %, Zn (zinc): 1.0 atomic % to 9.0 atomic %, Ni (nickel): 0.0 atomic % to 10.0 atomic %.
  • the aluminum alloy material having a chemical composition in which the balance is Al (aluminum) and unavoidable impurities.
  • the aluminum alloy material contains Mg, Zn, Ni, and Cu in respective contents within the specific ranges.
  • the aluminum alloy material further contains one or more of Ti, Mn and Fe in a content within the specific range.
  • the aluminum alloy material can improve the creep property by setting the chemical composition within the specific range.
  • the aluminum alloy material has excellent creep properties.
  • FIG. 1 is an explanatory diagram schematically showing an elemental map of the test material E1 in Example 1.
  • FIG. 2 is a backscattered electron image of the test material E1 in Example 1.
  • FIG. 3 is an explanatory diagram schematically showing an elemental map of the test material E2 in Example 1.
  • FIG. 4 is an explanatory diagram showing creep curves in the low strain region of test materials E1 to E4 and test materials C1 to C2.
  • FIG. 5 is an explanatory diagram showing creep curves in the low strain region of test materials E5 to E7, test material C1 and test material C3.
  • FIG. 6 is an explanatory diagram showing creep curves in the low strain region of test materials E8 to E10.
  • FIG. 7 is an explanatory diagram showing creep curves in the low strain region of test materials E11 to E14.
  • FIG. 8 is a backscattered electron image of the test material E1 after the creep test.
  • FIG. 9 is an enlarged backscattered electron image of the portion where Ti atoms exist in the Al matrix phase in FIG.
  • FIG. 10 is an enlarged backscattered electron image of a portion where no Ti atoms exist in the Al matrix phase in FIG. 11 is an elemental map of test material E15 in Example 2.
  • FIG. 12 is an elemental map of test material E16 in Example 2.
  • Mg forms second phase particles in the Al matrix by coexisting with Zn, and has the effect of improving the strength of the aluminum alloy material.
  • the content of Mg in the aluminum alloy material is 1.0 atomic % or more and 10.0 atomic % or less.
  • the content of Mg is preferably 1.5 atomic % or more and 9.5 atomic % or less, more preferably 2.0 atomic % or more and 9.0 atomic % or less, and 3.5 atomic % or more and 9.0 atomic % or less. 0 atomic % or less is more preferable, and 4.0 atomic % or more and 8.0 atomic % or less is particularly preferable. In this case, the creep property of the aluminum alloy material can be improved more easily.
  • the ratio Mg/Zn of the Mg content to the Zn content is preferably 0.8 or more and 2.0 or less, more preferably 1.0 or more and 1.5 or less. In this case, the strain rate in the secondary creep region in the strain rate-time curve is made smaller, and the effect of further improving the secondary creep property can be expected.
  • Zn 1.0 atomic % or more and 9.0 atomic % or less
  • Zn forms second phase particles in the Al matrix by coexisting with Mg, and has the effect of improving the strength of the aluminum alloy material.
  • the content of Zn in the aluminum alloy material is 1.0 atomic % or more and 9.0 atomic % or less.
  • the Zn content is preferably 1.5 atomic % or more and 8.5 atomic % or less, and more preferably 2.0 atomic % or more and 8.0 atomic % or less. In this case, the creep property can be improved more easily.
  • the aluminum alloy material can further improve the creep property compared to the case where either one or both of these elements are not added.
  • the Cu content in the aluminum alloy material is preferably 0.30 atomic % or more, more preferably 0.50 atomic % or more, and more preferably 0.80 atomic % or more. It is more preferably at least 1.2 atomic %, particularly preferably at least 1.2 atomic %. From the same point of view, the Ni content in the aluminum alloy material is preferably 0.30 atomic % or more, more preferably 0.50 atomic % or more, and 0.80 atomic % or more. is more preferable, and 1.2 atomic % or more is particularly preferable.
  • the Cu content in the aluminum alloy material is preferably 2.5 atomic % or less, and more preferably 2.2 atomic % or less. It is more preferably 1.5 atomic % or less, and particularly preferably 1.3 atomic % or less.
  • the Ni content in the aluminum alloy material is preferably 2.5 atomic % or less, more preferably 2.2 atomic % or less, and 1.5 atomic % or less. is more preferable, and 1.3 atomic % or less is particularly preferable.
  • the Cu content in the aluminum alloy material is 0.50 atomic % or more and 1.5 atomic % or less, and , Ni content is most preferably 0.50 atomic % or more and 1.5 atomic % or less.
  • Ti: 0.01 atomic % or more and 0.30 atomic %, Mn: 0.01 atomic % or more and 0.30 atomic % or less, Fe: 0.01 atomic % or more and 0.30 atomic % or less in the aluminum alloy material is, in addition to Mg, Zn, Cu and Ni, Ti: 0.01 atomic % to 0.30 atomic %, Mn: 0.01 atomic % to 0.30 atomic % and Fe: 0.01 atomic %
  • One or two or more of the elements above 0.30 atomic % and below are contained.
  • the second It is possible to suppress coarsening of phase particles. As a result, the progress of creep in the aluminum alloy material can be further retarded, and the creep properties can be further improved.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 0.25 atomic % or more and 3.0 atomic % or less and Cu: 0.25 atomic % or more and 3.0 atomic % or less, and Ti: 0.01 atomic % or more and 0.30 atomic % or less and Mn: It is preferable to have a chemical component containing one or more elements of 0.01 atomic % or more and 0.30 atomic % or less, with the balance being Al and unavoidable impurities.
  • the Ti content in the aluminum alloy material is preferably 0.02 atomic % or more, more preferably 0.03 atomic % or more. It is preferably 0.04 atomic % or more, and particularly preferably 0.07 atomic % or more. From the same point of view, the content of Mn and the content of Fe in the aluminum alloy material are each preferably 0.02 atomic % or more, more preferably 0.03 atomic % or more, and 0 It is more preferably 0.04 atomic % or more, and particularly preferably 0.07 atomic % or more.
  • the content of Ti in the aluminum alloy material is preferably 0.25 atomic % or less, more preferably 0.22 atomic % or less. , is more preferably 0.17 atomic % or less, and particularly preferably 0.15 atomic % or less.
  • the content of Mn and the content of Fe in the aluminum alloy material are each preferably 0.25 atomic % or less, more preferably 0.22 atomic % or less, and 0 It is more preferably 0.17 atomic % or less, and particularly preferably 0.15 atomic % or less.
  • the aluminum alloy material contains, for example, Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 1.5 atomic % % and 3.0 atomic % or less and Cu: more than 1.5 atomic % and 3.0 atomic % or less, Ti: 0.01 atomic % or more and 0.17 atomic % or less, Mn: 0.01 atomic % or more and 0.17 atomic % or less.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 1.5 More than 3.0 atomic % and Cu: more than 1.5 atomic % and 3.0 atomic % or less, Ti: 0.01 atomic % or more and 0.17 atomic % or less, and Mn: 0 It is preferable to have a chemical composition containing one or two elements in the range of 0.01 atomic % to 0.17 atomic % and the balance being Al and unavoidable impurities.
  • the Cu content is more than 1.5 atomic percent and 3.0 atomic percent or less, and the Ni content is more than 1.5 atomic percent and 3.0 atomic percent.
  • At least Ti is included among Ti, Mn and Fe, and the content of Ti is preferably 0.01 atomic % or more and 0.17 atomic % or less.
  • the aluminum alloy material has, for example, Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: more than 1.5 atomic % and 3 0 atomic % or less and Cu: more than 1.5 atomic % and 3.0 atomic % or less, Ti: 0.01 atomic % or more and 0.17 atomic % or less, Mn: 0.01 atomic % or more and 0.01 atomic % or less. 17 atomic % or less and Fe: 0.01 atomic % or more and 0.17 atomic % or less, preferably having a chemical composition containing at least Ti and the balance being Al and unavoidable impurities.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 1.5 more than 3.0 atomic %, Cu: more than 1.5 atomic % and 3.0 atomic % or less, and Ti: 0.01 atomic % or more and 0.17 atomic % or less, and the balance is Al and unavoidable It is more preferable to have a chemical composition consisting of organic impurities.
  • the aluminum alloy material contains, for example, Mg: 1.0 atomic % to 10.0 atomic %, Zn: 1.0 atomic % to 9.0 atomic %, Ni: 0.25 atomic % to 1.0 atomic %. 5 atomic % or less and Cu: 0.25 atomic % or more and 1.5 atomic % or less, Ti: 0.01 atomic % or more and 0.30 atomic % or less, Mn: 0.01 atomic % or more and 0.5 atomic % or less It may contain one or more elements selected from 30 atomic % or less and Fe: 0.01 atomic % or more and 0.30 atomic % or less.
  • An aluminum alloy material having such chemical components has excellent creep properties and can be easily reduced in density.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 0.25 atomic % or more and 1.5 atomic % or less, Cu: 0.25 atomic % or more and 1.5 atomic % or less, and Ti: 0.07 atomic % or more and 0.30 atomic % It is preferable to contain one or two elements selected from atomic % or less and Mn: 0.07 atomic % or more and 0.30 atomic % or less.
  • the Cu content is 0.25 atomic % or more and 1.5 atomic % or less
  • the Ni content is 0.25 atomic % or more and 1.5 atomic %. and preferably contains at least Ti among Ti, Mn and Fe and contains one or two elements of Mn and Fe.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 0.25 atomic % or more and 1.5 atoms % or less, Cu: 0.25 atomic % or more and 1.5 atomic % or less and Ti: 0.01 atomic % or more and 0.30 atomic % or less, and Mn: 0.01 atomic % or more and 0.30 atomic % or less % or less and Fe: 0.01 atomic % or more and 0.30 atomic % or less.
  • the aluminum alloy material contains Mg: 1.0 atomic % or more and 10.0 atomic % or less, Zn: 1.0 atomic % or more and 9.0 atomic % or less, Ni: 0.25 at least 1.5 atomic %, Cu: from 0.25 atomic % to 1.5 atomic %, Ti: from 0.01 atomic % to 0.30 atomic %, and Mn: from 0.01 atomic % to 0.01 atomic %. It is more preferable to contain 30 atomic % or less. In this case, the total content of Ti and Mn is particularly preferably 0.15 atomic % or more and 0.35 atomic % or less.
  • the aluminum alloy material preferably has a metallographic structure in which second-phase particles are dispersed in an Al matrix.
  • the second phase particles formed in the Al matrix include, for example, ⁇ phase precipitates having a composition represented by the composition formula Zn 2 Mg, and compositions represented by the composition formula Al 3 (Cu, Ni) 2 and a T-phase precipitate having a composition represented by the composition formula Al 6 Mg 11 Zn 11 .
  • the second phase particles in the Al matrix can strengthen the aluminum alloy material and further improve the strength of the aluminum alloy material.
  • the second-phase particles in the aluminum alloy material contain T-phase precipitates with a major axis of 0.05 ⁇ m or less.
  • T-phase precipitates are highly stable in high-temperature environments. Therefore, by precipitating a large amount of fine T-phase precipitates in the Al matrix, the strength of the aluminum alloy material at high temperatures can be further improved.
  • Ti atoms, Mn atoms and Fe atoms contained in the Al matrix phase have the effect of suppressing coarsening of T-phase precipitates due to heat and stress. Therefore, when T-phase precipitates are formed in the Al matrix containing these atoms, it is necessary to maintain the state in which the T-phase precipitates are finely dispersed in the Al matrix for a longer period of time. can be done. As a result, the creep property of the aluminum alloy material can be further improved.
  • the Ti atoms are preferably distributed throughout the Al matrix.
  • An aluminum alloy material having such a metal structure has higher hardness. Further, by making the distribution of Ti atoms in the Al matrix more uniform in this way, it is possible to exhibit the effect of suppressing the coarsening of T-phase precipitates due to Ti atoms in the entire aluminum alloy material. From the same point of view, it is more preferable that the maximum concentration of Ti atoms in the Al matrix is 150% or less of the average concentration of Ti atoms in the aluminum alloy material.
  • the distribution state of Ti atoms in the Al matrix and the concentration of Ti atoms in the Al matrix described above can be evaluated based on the elemental map of the aluminum alloy material.
  • An electron probe microanalyzer (EPMA) for example, may be used to acquire the elemental map of the aluminum alloy material.
  • the above-mentioned aluminum alloy material has a creep property in which the time required for the creep strain to reach 0.4% is 440 hours or more when a creep test is performed under the conditions of a test temperature of 200 ° C and a test stress of 105 MPa. and more preferably have a creep property of 600 hours or more.
  • Aluminum alloy materials having such creep properties are suitable for machine parts used in high-temperature environments.
  • the aluminum alloy material has a characteristic that the strength is not easily lowered even in a high-temperature environment.
  • the aluminum alloy material has excellent creep properties even in a high temperature environment. Taking advantage of these characteristics, the aluminum alloy material can be suitably used for machine parts used in a high temperature environment of 170° C. or higher.
  • Such mechanical parts include, for example, compressor parts for transport machines that are incorporated in transport machines such as automobiles.
  • the aluminum alloy material is particularly suitable for an impeller incorporated in a turbocharger among compressor parts for transport machines.
  • the aluminum alloy material is manufactured by, for example, sequentially performing casting, solution treatment, quenching and aging treatment. Moreover, in the manufacturing method of the above aspect, the ingot after casting may be subjected to a homogenization treatment and a drawing process, if necessary.
  • an ingot having the specific chemical composition may be produced by a method such as continuous casting or semi-continuous casting.
  • an effect of further improving the hardness of the aluminum alloy material can be expected. The reason for this is thought to be that if the molten metal is rapidly solidified during casting, the strain accumulated in the crystal grains increases.
  • the heating temperature can be appropriately set within the range of, for example, 420°C or higher and 500°C or lower.
  • the holding time in the homogenization treatment can be appropriately set within a range of, for example, 10 hours or more and 48 hours or less. If the heating temperature in the homogenization treatment is too low or the holding time is too short, the homogenization of the ingot becomes insufficient, and problems such as segregation may occur. Moreover, in this case, there is a possibility that deformation resistance will increase when plastic working is performed later.
  • the heating temperature in the homogenization process is too high or the holding time is too long, the energy required to heat the ingot increases, which may lead to an increase in manufacturing costs. Moreover, in this case, cracks may easily occur when plastic working is performed later. From the viewpoint of avoiding these problems more reliably, it is preferable to set the heating temperature in the homogenization treatment within the range of 440° C. or higher and 490° C. or lower. From the same point of view, it is preferable to set the holding time in the homogenization treatment within the range of 20 hours or more and 30 hours or less.
  • the stretching is performed by one type of processing selected from hot rolling, cold rolling, hot extrusion, cold extrusion, hot forging, and cold forging. Alternatively, two or more of these processes may be combined. Further, heat treatment such as annealing can be performed as necessary during the drawing process.
  • the ingot or wrought material is heated to dissolve solute elements such as Mg into the Al matrix.
  • solute elements such as Mg into the Al matrix.
  • the heating temperature in the solution treatment can be appropriately set within the range of, for example, 420°C or higher and 500°C or lower.
  • the holding time in the solution treatment can be appropriately set within the range of 20 hours or more and 48 hours or less.
  • the solute elements may not be sufficiently solidified and the amount of second phase particles after aging treatment may decrease. As a result, the creep property of the aluminum alloy material may deteriorate. If the heating temperature in the solution treatment is too high or the holding time is too long, the energy required for heating the ingot or wrought material increases, which may lead to an increase in manufacturing costs.
  • the method of quenching the ingot or wrought material is not particularly limited, and a method such as water quenching can be used, for example.
  • the ingot or wrought material that has become a supersaturated solid solution through solution treatment and quenching is heated and aged.
  • the heating temperature in the aging treatment can be appropriately set within a range of, for example, 170°C or higher and 300°C or lower.
  • the holding time in the aging treatment can be appropriately set within the range of 1 hour or more and 100 hours or less.
  • the heating temperature in the aging treatment is too low or the holding time is too short, the amount of second phase particles may decrease. As a result, the creep property of the aluminum alloy material may deteriorate. If the heating temperature in the aging treatment is too high or the holding time is too long, overaging will occur, which may lead to deterioration of the creep properties of the aluminum alloy material. From the viewpoint of avoiding these problems more reliably, it is preferable to set the heating temperature in the aging treatment within the range of 170° C. or more and 250° C. or less. From the same point of view, it is preferable to set the holding time in the aging treatment within the range of 1 hour or more and 10 hours or less.
  • Example 1 Examples of the aluminum alloy material and the manufacturing method thereof will be described below.
  • an ingot having the chemical composition shown in Table 1 was produced by a conventional method.
  • "-" in the chemical composition column of Table 1 is a symbol indicating that the element is not contained, and "Bal.” is a symbol indicating the remainder.
  • the obtained ingot was subjected to solution treatment by holding it at a temperature of 480°C for 24 hours, and then water quenching. Then, the ingot after water quenching was held at a temperature of 200° C. for 10 hours for aging treatment.
  • the aluminum alloy materials test materials E1 to E14 and test materials C1 to C3 shown in Table 1 were obtained.
  • FIG. 1 schematically shows an elemental map of the test material E1.
  • the Al matrix 1 of the test material E1 contained Mg atoms, Zn atoms, Cu atoms, and the like solid-dissolved in the Al matrix 1 . Furthermore, the Al matrix 1 in the test material E1 had a portion 1a containing Ti atoms and a portion 1b containing no Ti atoms. Second phase particles 2 having a major diameter of about 1 to 5 ⁇ m are formed at the grain boundaries of the Al matrix 1, and the second phase particles 2 include T-phase precipitates 2a and Al 3 (Ni , Cu) 2 and an intermetallic compound 2b having a composition of 2 were included.
  • FIG. 2 shows a further enlarged backscattered electron image of the portion 1a containing Ti atoms in the Al matrix 1 of FIG.
  • the portion shown in gray in FIG. 2 is the Al matrix, and the white dots dispersed in the Al matrix are finely precipitated T-phase precipitates. Moreover, the major axis of these T-phase precipitates is 0.05 ⁇ m or less. According to FIG. 2, in the test material E1, it was confirmed that a large amount of fine T-phase precipitates were also deposited inside the portion 1a containing Ti atoms in the Al matrix 1.
  • T-phase precipitates having a major axis of 0.05 ⁇ m or less are formed inside the Al matrix 1 in the portion 1b where the Ti atoms are not contained in the Al matrix 1, as in FIG. A large amount was deposited.
  • the elemental map of the test material E2 is shown typically in FIG.
  • the Al matrix 1 of the test material E2 contained Mg atoms, Zn atoms, Cu atoms, and the like dissolved in the Al matrix 1 as a solid solution.
  • Mn atoms were contained in the Al matrix phase 1 in the test material E2.
  • second phase particles 2 such as T-phase precipitates 2a and intermetallic compounds 2b having a composition of Al 3 (Ni, Cu) 2 were formed at the grain boundaries of the Al matrix 1 .
  • Mn atoms in the test material E2 were distributed not only in the Al matrix 1 but also around the intermetallic compound 2b. From these results, it can be understood that the Mn atoms in the test material E2 are mainly present in the crystal grains of the Al matrix phase 1 and at the grain boundaries.
  • test materials E1 to E14 and test materials C1 to C3 were evaluated.
  • a dumbbell-shaped test piece was taken from the obtained test material.
  • a creep test was performed by a method according to JIS Z2271:2010.
  • a single creep tester was used for the creep test, the test temperature was 200° C., and the test stress was 105 MPa.
  • the length of the test piece was 57 mm including the grip portion, the diameter of the parallel portion was ⁇ 4 mm, and the diameter of the grip portion was ⁇ 8 mm.
  • Figures 4 to 7 show the creep characteristics of each test material.
  • the horizontal axis is the elapsed time (unit: hour) from the start of the test, and the vertical axis is the creep strain (unit: %) of the test material.
  • Table 1 also shows the time required for the creep strain to reach 0.4%.
  • test material E4 the test was completed before the creep strain reached 0.4%, so the "required time to creep strain 0.4%" column in Table 1 shows the elapsed time until the end of the test. Values with the symbol ">" are shown.
  • test materials E1 to E14 are composed of aluminum alloys having the specific chemical components. Therefore, these test materials have the required creep strain to reach 0.4% compared to the test materials C1 to C3 that do not contain at least one element selected from Ni, Cu, Ti, Mn and Fe. time is getting longer. More specifically, the time required for the creep strain of the test materials E1 to E14 to reach 0.4% was all 440 hours or longer.
  • the aluminum alloy material containing Mg, Zn, Ni and Cu and containing one or more elements of Ti, Mn and Fe in a content within the specific range is excellent. It can be understood that it has creep characteristics.
  • FIG. 8 shows a backscattered electron image of the cross section of the test material E1 as an example of the metallographic structure after the creep test. As shown in FIG. 8, it was confirmed that second phase particles 2 having a long diameter of about several ⁇ m were present in the test material E1 after the creep test. In addition, the portion 1a containing Ti atoms in the Al matrix 1 appearing in the cross section had a lower brightness than the portion 1b containing no Ti atoms.
  • Ti atoms in the Al matrix 1 have the effect of suppressing the coarsening of T-phase precipitates in the Al matrix 1 even when heat and stress are applied to the aluminum alloy material.
  • the creep property was improved because the coarsening of the T-phase precipitates was suppressed during the creep test.
  • Example 2 In this example, an aluminum alloy material was produced by changing the cooling rate during casting, and the metal structure and Vickers hardness of the obtained aluminum alloy material were evaluated.
  • the method for producing the aluminum alloy materials (test materials E15 to E16) produced in this example is as follows.
  • molten aluminum alloy material having the same composition as the test material E1 shown in Table 1 was prepared. This molten metal was poured into a mold having a cylindrical cavity with an inner diameter of 10 mm, and the molten metal was solidified in the mold. As described above, a cylindrical test material E16 having a diameter of about 10 mm was obtained.
  • test material E15 and test material E16 obtained above were evaluated by the following methods.
  • test material E15 and the test material E16 were cut at arbitrary cross sections.
  • the cut surface was observed using SEM-EDX to obtain an elemental map.
  • 11 and 12 show an example of the elemental map of each test material.
  • the surroundings of the Al matrix 1 are Al-Mg-Zn-Cu-based intermetallic compounds and Al-Ni-based intermetallic compounds. It was surrounded by an intermetallic compound phase 3 such as a compound.
  • the Al matrix phase 1 of the test material E15 the Al matrix phase having a relatively large grain size has a portion 1a containing Ti atoms and a portion 1b containing almost no Ti atoms.
  • the Al matrix phase with a relatively small grain size was composed of the portion 1b containing almost no Ti atoms.
  • the maximum value of the concentration of Ti atoms in the portion 1a containing Ti atoms in the Al matrix 1 is 150% or more of the average concentration of Ti in the test material E11 (that is, 0.1 at%). guessed.
  • the Al matrix phase 1 was also surrounded by the intermetallic compound phase 3 in the elemental map of the test material E16. From the comparison between FIG. 11 and FIG. 12, it can be understood that the grain size of the Al matrix phase 1 of the test material E16 tends to be smaller overall than that of the test material E15.
  • Ti atoms were uniformly distributed in the Al matrix 1 of the test material E16, and it was composed of a portion 1a containing Ti atoms. In FIG. 12 , Ti atoms are distributed throughout the Al matrix 1 . Therefore, it is estimated that the maximum concentration of Ti atoms in the portion 1a containing Ti atoms in the Al matrix 1 in FIG. 12 is less than 150% of the average concentration of Ti in the test material E16.
  • Vickers hardness of each test material was measured based on JISZ2244:2009. Specifically, each test material was measured five times with a measurement load of 1 kgf while changing the measurement position, and the arithmetic mean value and standard deviation of Vickers hardness were calculated based on these measurements. Table 2 shows these values.
  • the test material E16 which has a relatively high solidification rate during casting, has a finer metal structure than the test material E15, and the variation in the distribution of Ti atoms is also small. Moreover, the Vickers hardness of the test material E16 was higher than that of the test material E15. From these results, it can be understood that the hardness of the aluminum alloy material can be improved by increasing the solidification rate during casting.

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Abstract

Un matériau d'alliage d'aluminium selon la présente invention présente des composants chimiques comprenant de 1,0 à 10,0 % atomique de Mg, de 1,0 à 9,0 % atomique de Zn, de 0,25 à 3,0 % atomique de Ni et de 0,25 à 3,0 % atomique de Cu, et comprenant en outre un ou plusieurs types d'éléments parmi : de 0,01 à 0,30 % atomique de Ti, de 0,01 à 0,30 % atomique de Mn et de 0,01 à 0,30 % atomique de Fe, le reste étant constitué d'Al et d'impuretés inévitables.
PCT/JP2022/016719 2021-03-31 2022-03-31 Matériau d'alliage d'aluminium, son procédé de production et composant de machine WO2022211062A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63179043A (ja) * 1987-01-21 1988-07-23 Furukawa Alum Co Ltd 成形加工用アルミニウム合金
US5338510A (en) * 1993-10-04 1994-08-16 Zuech Romeo A Cast aluminum alloy and tooling fixture therefrom
JPH08283921A (ja) * 1995-04-17 1996-10-29 Ykk Kk 高強度アルミニウム合金固化材およびその製造方法
JP2013053361A (ja) * 2011-09-06 2013-03-21 Furukawa-Sky Aluminum Corp 耐熱強度に優れた飛翔体用アルミニウム合金
CN104046856A (zh) * 2014-07-01 2014-09-17 张家港市佳晟机械有限公司 一种铝铜镁系硬铝合金

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63179043A (ja) * 1987-01-21 1988-07-23 Furukawa Alum Co Ltd 成形加工用アルミニウム合金
US5338510A (en) * 1993-10-04 1994-08-16 Zuech Romeo A Cast aluminum alloy and tooling fixture therefrom
JPH08283921A (ja) * 1995-04-17 1996-10-29 Ykk Kk 高強度アルミニウム合金固化材およびその製造方法
JP2013053361A (ja) * 2011-09-06 2013-03-21 Furukawa-Sky Aluminum Corp 耐熱強度に優れた飛翔体用アルミニウム合金
CN104046856A (zh) * 2014-07-01 2014-09-17 张家港市佳晟机械有限公司 一种铝铜镁系硬铝合金

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