EP0478479A1 - Verfahren um das Mikrolunkerverhalten von Magnesiumlegierungen zu verbessern - Google Patents

Verfahren um das Mikrolunkerverhalten von Magnesiumlegierungen zu verbessern Download PDF

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Publication number
EP0478479A1
EP0478479A1 EP91420340A EP91420340A EP0478479A1 EP 0478479 A1 EP0478479 A1 EP 0478479A1 EP 91420340 A EP91420340 A EP 91420340A EP 91420340 A EP91420340 A EP 91420340A EP 0478479 A1 EP0478479 A1 EP 0478479A1
Authority
EP
European Patent Office
Prior art keywords
strontium
manganese
zinc
magnesium alloys
alloys
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.)
Granted
Application number
EP91420340A
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English (en)
French (fr)
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EP0478479B1 (de
Inventor
Jean Charbonnier
Gilles Nussbaum
Gilles Regazzoni
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.)
Ferropem SAS
Original Assignee
Pechiney Electrometallurgie SAS
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 Pechiney Electrometallurgie SAS filed Critical Pechiney Electrometallurgie SAS
Publication of EP0478479A1 publication Critical patent/EP0478479A1/de
Application granted granted Critical
Publication of EP0478479B1 publication Critical patent/EP0478479B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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 method making it possible to improve the microretassuring behavior of magnesium alloys.
  • Said alloys have good mechanical characteristics and excellent resistance to corrosion.
  • they when they are shaped from liquid metal by gravity molding, either in a sand mold or in waterproof mold or by pressure molding, they generally have micro-shrinkage in their mass. These shrinkages are due to the fact that during solidification, a contraction of the metal occurs which can reach several% by volume; if no supply of liquid metal is made in the contraction zone, then a vacuum is produced which results in the formation of a cavity or shrinkage.
  • the solidification interval of the metal is very large, as in the case of the alloys mentioned above, a relatively large pasty zone is formed in the molded part in which the contraction occurs gradually. The liquid metal is thus caused to travel between the solid dendrites over a long distance and cannot fill the voids: this results in the formation of microcavities distributed between the grains throughout the pasty zone; this is called micro-backwashing.
  • microbreaks tend to degrade the mechanical characteristics of the parts which contain them.
  • they form open porosities which make them unusable in applications where they are subjected to pressure.
  • the invention consists in adding to the magnesium alloy an element from the family of alkaline earths: strontium.
  • the amount of strontium added is between 0.01 and 2% by weight of the alloy because below 0.01%, the effect is negligible and above 2%, the addition turns out to be harmful because there is formation of a large quantity of intermetallic compounds which weaken the metal.
  • the purpose of this example is to show the influence of strontium on the mechanical characteristics of the AZ91 alloy. Test pieces without micro-backwashes, in the T4 and T6 state and containing 0 and 0.3% of strontium were subjected to tensile tests at room temperature and the values of the elastic limit R0.2, of the resistance were measured. at rupture Rm and elongation A. The results are shown in the following table.
  • T4 and T6 correspond to heat treatments for dissolving followed in the first case of a natural aging treatment and in the second of an artificial aging treatment.
  • strontium does not alter the mechanical tensile properties and even improves the plastic limit of the alloy in the T4 state.
  • the presence of strontium guaranteeing the absence of microretassures it is certain that the values obtained are representative of the properties of the whole part, which is more difficult to obtain in the absence of strontium.
  • the purpose of this example is to show the influence of strontium on corrosion resistance.
  • This invention finds its application, in particular in the manufacture of gearbox casings and structural elements of portable computers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Forging (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Domestic Plumbing Installations (AREA)
  • Mechanical Operated Clutches (AREA)
EP91420340A 1990-09-28 1991-09-26 Verfahren um das Mikrolunkerverhalten von Magnesiumlegierungen zu verbessern Expired - Lifetime EP0478479B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9012455 1990-09-28
FR9012455A FR2667328B1 (fr) 1990-09-28 1990-09-28 Procede permettant d'ameliorer le comportement a la microretassure des alliages de magnesium.

Publications (2)

Publication Number Publication Date
EP0478479A1 true EP0478479A1 (de) 1992-04-01
EP0478479B1 EP0478479B1 (de) 1995-05-17

Family

ID=9401070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420340A Expired - Lifetime EP0478479B1 (de) 1990-09-28 1991-09-26 Verfahren um das Mikrolunkerverhalten von Magnesiumlegierungen zu verbessern

Country Status (9)

Country Link
US (1) US5223215A (de)
EP (1) EP0478479B1 (de)
JP (1) JP2559306B2 (de)
KR (1) KR100225180B1 (de)
CA (1) CA2052372C (de)
DE (1) DE69109788T2 (de)
ES (1) ES2071961T3 (de)
FR (1) FR2667328B1 (de)
NO (1) NO179290C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0665299A1 (de) * 1993-12-17 1995-08-02 Mazda Motor Corporation Plastisch-verformbarer Gusswerkstoff aus Magnesium-Legierung aus dieser Legierung hergestellte Werkstücke sowie Verfahren zur Herstellung

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2144421A1 (en) * 1992-09-11 1994-03-31 Tadayoshi Nakamura Refined magnesium material and method for producing the same
US5693158A (en) * 1993-02-12 1997-12-02 Mazda Motor Corporation Magnesium light alloy product and method of producing the same
IL125681A (en) * 1998-08-06 2001-06-14 Dead Sea Magnesium Ltd Magnesium alloy for high temperature applications
US6322644B1 (en) * 1999-12-15 2001-11-27 Norands, Inc. Magnesium-based casting alloys having improved elevated temperature performance
US6808679B2 (en) * 1999-12-15 2004-10-26 Noranda, Inc. Magnesium-based casting alloys having improved elevated temperature performance, oxidation-resistant magnesium alloy melts, magnesium-based alloy castings prepared therefrom and methods for preparing same
CA2337630C (en) 2000-02-24 2005-02-01 Mitsubishi Aluminum Co., Ltd. Die casting magnesium alloy
US6342180B1 (en) 2000-06-05 2002-01-29 Noranda, Inc. Magnesium-based casting alloys having improved elevated temperature properties
JP3592659B2 (ja) * 2001-08-23 2004-11-24 株式会社日本製鋼所 耐食性に優れたマグネシウム合金およびマグネシウム合金部材
DE10251663A1 (de) * 2002-11-06 2004-05-19 Bayerische Motoren Werke Ag Magnesiumlegierung
CA2419010A1 (en) * 2003-02-17 2004-08-17 Noranda Inc. Strontium for melt oxidation reduction of magnesium and a method for adding strontium to magnesium
JP5249367B2 (ja) * 2003-06-19 2013-07-31 住友電気工業株式会社 マグネシウム基合金ねじ
CN1306052C (zh) * 2004-09-17 2007-03-21 中国科学院上海微系统与信息技术研究所 高耐蚀铸造镁铝合金及制备方法
DE102007061561A1 (de) 2007-12-18 2009-06-25 Magontec Gmbh Legierung umfassend Mg und Sr und hieraus gefertigte galvanische Opferanode
CN104745905A (zh) * 2013-12-30 2015-07-01 苏州昊卓新材料有限公司 一种高强度、高韧性压铸镁合金及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221254A (en) * 1939-11-13 1940-11-12 Dow Chemical Co Magnesium base alloy
US2464918A (en) * 1945-03-22 1949-03-22 Magnesium Elektron Ltd Magnesium base alloys
FR1214787A (fr) * 1958-02-11 1960-04-12 Fuchs Otto Alliages de magnésium à résistance de fluage élevée contre une déformation permanente aux températures élevées

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979452A (en) * 1933-03-25 1934-11-06 Kemet Lab Co Inc Magnesium alloy
US3119684A (en) * 1961-11-27 1964-01-28 Dow Chemical Co Article of magnesium-base alloy and method of making
US5041294A (en) * 1990-04-24 1991-08-20 Wm. Wrigley Jr. Company Sorbitol-modified flavor
US5143564A (en) * 1991-03-28 1992-09-01 Mcgill University Low porosity, fine grain sized strontium-treated magnesium alloy castings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221254A (en) * 1939-11-13 1940-11-12 Dow Chemical Co Magnesium base alloy
US2464918A (en) * 1945-03-22 1949-03-22 Magnesium Elektron Ltd Magnesium base alloys
FR1214787A (fr) * 1958-02-11 1960-04-12 Fuchs Otto Alliages de magnésium à résistance de fluage élevée contre une déformation permanente aux températures élevées

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0665299A1 (de) * 1993-12-17 1995-08-02 Mazda Motor Corporation Plastisch-verformbarer Gusswerkstoff aus Magnesium-Legierung aus dieser Legierung hergestellte Werkstücke sowie Verfahren zur Herstellung
US6143097A (en) * 1993-12-17 2000-11-07 Mazda Motor Corporation Magnesium alloy cast material for plastic processing, magnesium alloy member using the same, and manufacturing method thereof

Also Published As

Publication number Publication date
KR100225180B1 (ko) 1999-10-15
EP0478479B1 (de) 1995-05-17
ES2071961T3 (es) 1995-07-01
CA2052372C (fr) 1997-03-18
FR2667328A1 (fr) 1992-04-03
CA2052372A1 (fr) 1992-03-29
DE69109788T2 (de) 1995-09-21
DE69109788D1 (de) 1995-06-22
NO913693L (no) 1992-03-30
NO179290B (no) 1996-06-03
FR2667328B1 (fr) 1992-11-06
NO179290C (no) 1996-09-11
US5223215A (en) 1993-06-29
JP2559306B2 (ja) 1996-12-04
NO913693D0 (no) 1991-09-19
KR920006526A (ko) 1992-04-27
JPH0867928A (ja) 1996-03-12

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