EP1081243A1 - Elément à partir d'un alliage de magnésium - Google Patents

Elément à partir d'un alliage de magnésium Download PDF

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Publication number
EP1081243A1
EP1081243A1 EP00117254A EP00117254A EP1081243A1 EP 1081243 A1 EP1081243 A1 EP 1081243A1 EP 00117254 A EP00117254 A EP 00117254A EP 00117254 A EP00117254 A EP 00117254A EP 1081243 A1 EP1081243 A1 EP 1081243A1
Authority
EP
European Patent Office
Prior art keywords
magnesium alloy
tensile strength
speed deformation
member formed
less
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00117254A
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German (de)
English (en)
Inventor
Kazuo Sakamoto
Motoyasu Asakawa
Yukio Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Publication of EP1081243A1 publication Critical patent/EP1081243A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • 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
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
    • 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

Definitions

  • the present invention relates to a member formed by magnesium alloy being excellent in high-speed deformation characteristics.
  • Alloy components molded by die casting or gravity casting using aluminum, magnesium, and the like as raw materials are used as automobile components such as instrument panels which are required to absorb energy at the time of collision.
  • Japanese Patent Laid-Open No. 9-272945 proposes a heat-resistant magnesium alloy, which contains 2 to 6 wt% of aluminum, 0.5 to 4 wt% of calcium, and the balance of magnesium and inevitable impurities, has a calcium to aluminum ratio of 0.8 or less, and is excellent particularly in molding and elongation while maintaining excellent creep resistance.
  • the present invention has been made in consideration of the above situation, and has as its object to provide a member formed by magnesium alloy, which is excellent in molding, tensile strength, and high-speed deformation characteristics and can assure a high elongation.
  • a member formed by magnesium alloy which is excellent in molding, tensile strength, and high-speed deformation characteristics and can assure a high elongation, comprising a portion which is excellent in high-speed deformation characteristics, has a solid phase fraction of more than 0% to 60% or less, contains 2.0 to 6.5 wt% of aluminum, and has a strain rate of not less than 100/s.
  • the member formed by magnesium alloy can be used as, e.g., a collision energy absorption member for an automobile.
  • member formed by magnesium alloy which is excellent in molding, tensile strength, and high-speed deformation characteristics and can assure a high elongation, comprising a portion which is excellent in high-speed deformation characteristics, has a solid phase fraction of more than 0% to 60% or less, contains 2.0 to 6.5 wt% of aluminum, and has a strain rate of not less than 100/s.
  • the member formed by magnesium alloy can be used as, e.g., the collision energy absorption member of an automobile.
  • a molded surface is left to inhibit the defective portion from appearing on the surface of the member to assure excellent high-speed deformation characteristics, although the defective portion (pore) tends to form at the central portion of a molded product in relation to a cooling rate.
  • a member formed by magnesium alloy which is excellent in molding, tensile strength, and high-speed deformation characteristics and can assure a high elongation, wherein a local internal defective ratio is not more than 1%.
  • the member formed by magnesium alloy can be used as, e.g., a collision energy absorption member for an automobile.
  • a member formed by magnesium alloy which is excellent in molding, tensile strength, and high-speed deformation characteristics and can assure a high elongation, wherein an overall internal defective ratio is not more than 1%.
  • the member formed by magnesium alloy can be used as, e.g., a collision energy absorption member for an automobile.
  • the aluminum content is 3.0 to 6.5 wt% to improve the fluidity of the raw material in molding.
  • the solid phase fraction is more than 0% to 40% or less to improve the fluidity of the raw material in molding.
  • Fig. 1 is a schematic view showing the main part of a semi-solid injection molding machine according to this embodiment.
  • a screw 2 is rotated to feed a raw material 3 to a heating cylinder 4.
  • the screw 3 heats the raw material 3 to a semi-solid state while sufficiently stirring and kneading the raw material 3.
  • the screw 2 moves backward by the pressure of the semi-solid raw material 3.
  • the screw may be forcibly moved backward at an arbitrary speed in another method.
  • a high-speed injection mechanism 5 detects this and stops rotating the screw. At the same time, backward movement of the screw 2 stops.
  • the raw material 3 is metered by setting the backward movement distance of the screw 3.
  • the high-speed injection mechanism 5 moves the screw 2 forward to inject the semi-solid raw material 3 into a die 6.
  • the raw material 3 is granulated magnesium pellets which are fed from a hopper 8 to the cylinder 4.
  • a path 7 from the hopper 8 to the cylinder 4 is filled with argon gas.
  • the raw material 3 e.g., magnesium pellets
  • the raw material 3 is exposed to the argon atmosphere to prevent its oxidation.
  • the raw material 3 can be uniformly heated in a heating zone 1 in the heating cylinder 4 while being sufficiently stirred and kneaded with the screw 2.
  • Fig. 2 is a graph showing the relationship between the tensile strength and the cylinder temperature using the solid phase fraction as a parameter.
  • Fig. 3 is a graph showing the relationship between the elongation and the aluminum content.
  • Fig. 4 is a graph showing the relationship between the tensile strength and the internal defective ratio.
  • Fig. 5 is a graph showing the relationship between the tensile strength and the strain rate.
  • Table 1 shows the chemical compositions of members formed by magnesium alloy of this embodiment.
  • the tensile strength at the strain rate of 2 x 10 3 /s exhibits the test result in high-speed deformation, while the tensile strength at the strain rate of 4 x 10 -3 exhibits the static tensile strength test result in low-speed deformation.
  • the tensile strength of alloy I in Table 1 extremely decreases when the solid phase fraction is 0%. When the solid phase fraction exceeds 60%, it is difficult to obtain stable members formed by magnesium alloy by continuous injection molding.
  • alloy II having an aluminum content of 9.0 wt% or more exhibits the same elongation in both high-speed deformation and low-speed deformation.
  • Alloy I having an aluminum content of 6.5 wt% or less exhibits excellent elongation but alloy I having an aluminum content of 6.5 wt% or more exhibits an elongation lower than the tensile strength (JIS reference value) in low-speed deformation.
  • Alloy I cannot obtain a sufficient elongation in high-speed deformation at a strain rate of 1.8 x 10 3 /s.
  • the aluminum content is less than 2.0 wt%, it is difficult to supply the semi-solid raw material to the heating cylinder and hence perform injection molding.
  • Fig. 3 shows as reference values the static tensile test results of alloys I and II based on the JIS (Japanese Industrial Standards).
  • the solid phase fraction is the volume ratio of a solid phase present in the semi-solid state.
  • the internal defective ratio is a value calculated by (1 - density of cast member/theoretical density) x 100 (%) and represents the degree at which an air gap (e.g., a void and gas hole) is present in local areas of the product, which particularly need strength.
  • a member formed by magnesium alloy is made to have a solid phase fraction of 0% (exclusive) to 60% (inclusive), an aluminum content of 2.0 wt% (inclusive) to 6.5 wt% (inclusive), and a strain rate of 1 x 10 2 /s or more corresponding to an internal defective ratio of 1% or less, thereby achieving tensile strength and elongation excellent in high-speed deformation.
  • the aluminum content be 3.0 wt% or more to obtain a member with more stable quality by continuous injection molding and hence increase the elongation. Therefore, the aluminum content is preferably set in the range of 3.0 wt% (inclusive) and 6.5 wt% (inclusive).
  • the solid phase fraction when set in the range of 0% (exclusive) to 40% (inclusive), stable fluidity can be obtained.
  • the heating cylinder can be filled with the material for a relatively large member, and a high tensile strength can be maintained.
  • a member whose molded surface is left on one surface is more excellent in tensile strength in high-speed deformation than a member whose molded surface is perfectly removed.
  • a solid phase fraction of 0% i.e., perfect molten molding
  • the solid phase fraction may be set in the range of 0% (inclusive) to 60% (inclusive), over which it is difficult to obtain members with stabler quality by continuous molding, while the aluminum content and strain rate remain in the above ranges.
  • the molded surface of a portion in the member formed by magnesium alloy of this embodiment, which has a high tensile strength in high-speed deformation is completely left without machining.
  • the molded surface is left on a portion which experiences a high stress value in the event of a collision.
  • Fig. 8 is a perspective view showing the outer appearance of member formed by magnesium alloy according to the embodiment of the present invention.
  • the member formed by magnesium alloy of this embodiment is effectively applied to an instrument panel, seat frame (Fig. 8), or steering wheel, which is required to have a high energy absorption (high elongation) in collision (high-speed deformation).
  • the member formed by magnesium alloy of this embodiment may locally or entirely form a portion which requires high tensile strength and elongation in high-speed deformation.
  • Fig. 6 is a view for explaining a method of reducing an internal defective ratio at a portion which requires a high tensile strength.
  • the internal defective ratio of a portion which requires a high tensile strength can be reduced by forcibly applying a pressure to that portion during solidification or by using a local pressurizing process.
  • a local pressurizing pin 10 is disposed in a portion (e.g., a thick-walled portion of a cast member) which tends to have an internal defect, and a pressure is forcibly applied to the portion P1 during solidification, thereby reducing the internal defective ratio.
  • a portion e.g., a thick-walled portion of a cast member
  • the portion of the member formed by magnesium alloy of this embodiment which requires a high tensile strength and elongation in high-speed deformation may locally or entirely have an internal defective ratio of 1% or less.
  • Fig. 7 is a view for explaining the tensile strength test method in high-speed deformation.
  • this embodiment employs the Hopkinson bar method of indirectly determining the dynamic load acting on a test piece 23 and its strain using the strain gauges of an input bar 21 and output bar 22 in accordance with the one-dimensional theory of elastic wave propagation.
  • test piece 23 is sandwiched between the input bar 21 and output bar 22, and an impact load is applied on the input bar 21.
  • ⁇ i be the strain of an elastic wave propagating through the input bar 21
  • ⁇ r be the strain produced when the elastic wave is reflected by the interface between the input bar 21 and test piece 23 and returns to the input bar 21
  • ⁇ t be the strain produced when the elastic wave having passed through the test piece 23 passes through the output bar 22.
  • ⁇ s EA 2 A s ( ⁇ i + ⁇ r + ⁇ t )
  • a s is the sectional area of the test piece
  • A is the sectional area of the input and output bars
  • E is the Yong's modulus of the input and output bars.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Body Structure For Vehicles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP00117254A 1999-09-06 2000-08-14 Elément à partir d'un alliage de magnésium Withdrawn EP1081243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25173899A JP2001073059A (ja) 1999-09-06 1999-09-06 マグネシウム合金成形部材
JP25173899 1999-09-06

Publications (1)

Publication Number Publication Date
EP1081243A1 true EP1081243A1 (fr) 2001-03-07

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Family Applications (1)

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EP00117254A Withdrawn EP1081243A1 (fr) 1999-09-06 2000-08-14 Elément à partir d'un alliage de magnésium

Country Status (3)

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EP (1) EP1081243A1 (fr)
JP (1) JP2001073059A (fr)
KR (1) KR20010030267A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107983921A (zh) * 2017-12-11 2018-05-04 昆明理工大学 一种半固态浆料的制备方法及装置
CN108817397A (zh) * 2018-07-16 2018-11-16 南方科技大学 一种增材制造装置及方法
CN109913719A (zh) * 2017-12-12 2019-06-21 富士通株式会社 镁合金及其制造方法和电子设备
CN110014131A (zh) * 2019-05-09 2019-07-16 宁夏中太镁业科技有限公司 一种半固态镁合金高压射出成型工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4955158B2 (ja) * 2001-07-11 2012-06-20 パナソニック株式会社 マグネシウム合金板材
JP4631231B2 (ja) * 2001-08-14 2011-02-16 マツダ株式会社 車両用マグネシウム合金製ホイール及びその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07224344A (ja) * 1993-12-17 1995-08-22 Mazda Motor Corp 塑性加工用マグネシウム合金鋳造素材、それを用いたマグネシウム合金部材及びそれらの製造方法
EP0799901A1 (fr) * 1996-04-04 1997-10-08 Mazda Motor Corporation Alliage à base de magnesium résistant à la chaleur
EP0905266A1 (fr) * 1997-09-29 1999-03-31 Mazda Motor Corporation Procédé de fabrication d'un alliage léger à l'état semi-solide et produits obtenus avec ce procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07224344A (ja) * 1993-12-17 1995-08-22 Mazda Motor Corp 塑性加工用マグネシウム合金鋳造素材、それを用いたマグネシウム合金部材及びそれらの製造方法
EP0799901A1 (fr) * 1996-04-04 1997-10-08 Mazda Motor Corporation Alliage à base de magnesium résistant à la chaleur
EP0905266A1 (fr) * 1997-09-29 1999-03-31 Mazda Motor Corporation Procédé de fabrication d'un alliage léger à l'état semi-solide et produits obtenus avec ce procédé

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
B.E.CARLSON: "The Effect of Strain Rate and Temperature on the Deformation of Die Cast AM60B", SOC. AUTOMOT. ENG. SPEC. PUB. SP-1096, 1995, pages 33 - 41, XP000961539 *
GHOSH D ET AL: "DEVELOPMENT OF DUCTILE THIXOMOLDED MAGNESIUM ALLOYS", RECENT METALLURGICAL ADVANCES IN LIGHT METALS INDUSTRIES, XP002034402 *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107983921A (zh) * 2017-12-11 2018-05-04 昆明理工大学 一种半固态浆料的制备方法及装置
CN109913719A (zh) * 2017-12-12 2019-06-21 富士通株式会社 镁合金及其制造方法和电子设备
CN109913719B (zh) * 2017-12-12 2021-12-07 富士通株式会社 镁合金及其制造方法和电子设备
CN108817397A (zh) * 2018-07-16 2018-11-16 南方科技大学 一种增材制造装置及方法
CN110014131A (zh) * 2019-05-09 2019-07-16 宁夏中太镁业科技有限公司 一种半固态镁合金高压射出成型工艺

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Publication number Publication date
KR20010030267A (ko) 2001-04-16
JP2001073059A (ja) 2001-03-21

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