EP1241276A1 - Alliage de magnesium résistant au fluage - Google Patents

Alliage de magnesium résistant au fluage Download PDF

Info

Publication number
EP1241276A1
EP1241276A1 EP02251809A EP02251809A EP1241276A1 EP 1241276 A1 EP1241276 A1 EP 1241276A1 EP 02251809 A EP02251809 A EP 02251809A EP 02251809 A EP02251809 A EP 02251809A EP 1241276 A1 EP1241276 A1 EP 1241276A1
Authority
EP
European Patent Office
Prior art keywords
alloy
mass
percent
creep
sample
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Withdrawn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
EP02251809A
Other languages
German (de)
English (en)
Inventor
Hiroyuki c/o Ryobi Ltd Omura
Youji c/o Ryobi Ltd Yamada
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.)
Ryobi Ltd
Original Assignee
Ryobi Ltd
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 Ryobi Ltd filed Critical Ryobi Ltd
Publication of EP1241276A1 publication Critical patent/EP1241276A1/fr
Withdrawn legal-status Critical Current

Links

Images

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 light-weight magnesium alloy members used as mechanical parts, such as automobile parts and two-wheeled vehicle parts, and more particularly, to a magnesium alloy, for example, a magnesium alloy for high pressure die-casting, with excellent castability and that does not generate casting defects such as casting cracking, and that has creep resistance, heat resistant strength, and corrosion resistance those required for use in high-temperature environments.
  • a magnesium alloy for example, a magnesium alloy for high pressure die-casting, with excellent castability and that does not generate casting defects such as casting cracking, and that has creep resistance, heat resistant strength, and corrosion resistance those required for use in high-temperature environments.
  • Magnesium alloys in high pressure die-casting defined by ASTM Standard Specification B93 are examples of conventional magnesium alloys used as materials in automobile parts.
  • AS-type alloys have excellent heat resistance.
  • AS21 alloy has relatively high creep resistance and is used in heat-resistance parts, such as in the transmission case of manual transmission automobiles.
  • AS21 alloy cannot overcome problems such as corrosion resistance. Also, even higher creep resistance properties are required in the high-temperature environment, such as the transmission case of automatic transmission automobiles.
  • AE42 alloy is a representative high pressure die-casting alloy that includes rare earth elements.
  • the creep resistance property of AE42 alloy is superior to AS21 alloy and AS41 alloy.
  • problems with castability, such as mold residue, of AE42 alloy so high pressure die-casting using AE42 alloy is problematic.
  • AE42 alloy is more expensive and is more difficult to produce in quantity than other alloys, such as AZ91D alloy.
  • a creep-resistant magnesium alloy that contains 1.5 to 4.0 percent by mass of Al, 0.5 to 1.8 percent by mass of Si, 0.05 to 0.6 percent by mass of RE, 0.005 to 1.5 percent by mass of Sr, and the balance Mg and unavoidable impurities.
  • the present invention also provides a creep-resistant magnesium alloy that contains 1.5 to 4.0 percent by mass of Al, 0.5 to 1.8 percent by mass of Si, 0.05 to 0.6 percent by mass of RE, 0.005 to 1.5 percent by mass of Sb, and the balance Mg and unavoidable impurities.
  • creep resistance can be greatly enhanced by adding RE and Sr to AS-type alloys, or by adding RE and Sb to AS-type alloys. Corrosion resistance is also improved. Also, the cost can be made less than for AE42 alloy. Further, castability can be improved because Si is included in hypo-eutectic, hyper-eutectic and eutectic phases.
  • the creep-resistant magnesium alloy contains 1.5 to 4.0 percent by mass of Al (aluminum), 0.5 to 1.8 percent by mass of Si (silicon), 0.05 to 0.6 percent by mass of rare earth elements (referred to as RE hereinafter), 0.005 to 1.5 percent by mass of Sr (strontium), and the remainder being Mg (magnesium) and unavoidable impurities.
  • creep resistance can be enhanced when 0.3 to 1.5 percent by mass of Ca (calcium) is contained.
  • corrosion resistance can be enhanced when 0.1 to 0.4 percent by mass of Mn (manganese) is contained.
  • the amount of Al exceeds 4.0 percent by mass, then creep resistance and corrosion resistance decrease so that creep resistance of the level of AE42 alloy cannot be obtained. Accordingly, the amount of Al added was set to 4.0 percent or less by mass. On the other hand, if the amount of Al is less than 1.5 percent by mass, then the castability (with respect to open cracks) does not improve so open crack and fluidity problems occur and proper casting cannot be performed. Accordingly the amount of Al added was set to 2.0 percent or more by mass.
  • Creep resistance and castability of a magnesium alloy improve in association with increase in the amount of Si added. However, if too much Si is added, then the liquidus temperature increases so that the casting temperature must be increased. If the amount of Si added exceeds 1.8 percent by mass, then the liquidus temperature will exceed 700 degrees centigrade, so that casting becomes difficult. Also, the corrosion resistance decreases. Accordingly, the amount of Si added was set to 1.8 percent or less by mass. On the other hand, if the amount of Si added is less than 0.5 percent by mass, then creep resistance decreases. Castability, such as tendency for open cracks, is adversely effected, so that casting is difficult. Accordingly, the amount of Si added was set to 0.5 percent or more by weight.
  • the solubility of RE tends to decrease with increase in the solubility of Si. Accordingly, considering the lower limit value (0.5%) for the additive amount of Si, the upper limit value of the amount of RE to be added was set to 0.6 percent by mass. On the other hand, when RE is added in amounts of less than 0.05 percent, then sufficient creep resistance strength cannot be obtained. Therefore, the lower limit value for RE to be added was set a 0.05 percent by mass.
  • Mn is added to improve corrosion resistance. No further improvement in corrosion resistance can be expected by added Mn in amounts greater than 0.4 percent by mass, and on the contrary compounds are produced so that creep resistance may be affected. Accordingly, the amount of Mn added was set to 0.4 percent or less by mass. On the other hand, if the amount of Mn added is less than 0.1 percent by mass, then no improvement in corrosion resistance is observed. Accordingly, the amount of Mn added was set to 0.1 percent or more by mass.
  • the amount of Ca added was set to 1.5 percent or less by mass.
  • the amount of Ca added was set to 0.3 percent or more by mass.
  • unavoidable impurities normally exist in minimal amounts of less than 0.004 percent by mass of Fe (iron), less than 0.001 percent by mass of Ni (nickel), less than 0.08 percent by mass of Cu (copper), less than 0.01 percent by mass of Zn (zinc), and the like.
  • the creep-resistant magnesium alloy is made from 1.5 to 4.0 percent by mass of Al, 0.5 to 1.8 percent by mass of Si, 0.05 to 0.6 percent by mass of RE, and 0.005 to 1.5 percent by mass of Sb (antimony), and a remainder portion made from Mg and unavoidable impurities.
  • 0.3 to 1.5 percent by mass of Ca can be included for enhancing creep resistance.
  • 0.1 to 0.4 percent by mass of Mn can be included for enhancing corrosion resistance.
  • Creep resistance experiments were performed for the alloys of the present invention and comparative materials. The change in displacement was measured that occurred over time when samples were subjected to a bending load in an ambient temperature of 200 degrees centigrade.
  • An ASTM standard tensile strength test sample, with diameter of 6.35 mm at the parallel portion, gage length of 50 mm, and length of 210 mm as shown in Fig. 2 was used for sample 1.
  • three samples 1a, 1b, and 1c were aligned in parallel and supported at their ends by supports 2a, 2b. The distance between the support 2a and support 2b was set at 150 mm. The samples 1a, 1b, and 1c were then applied with a load of 2 kg per sample.
  • Sample 1 is AZ91D alloy
  • sample 2 is AS41 alloy
  • sample 3 is AE42 alloy
  • samples 4 and 5 are alloys of the first embodiment of the present invention
  • samples 6 and 7 are alloys of the second embodiment of the present invention.
  • Alloy Al Zn Si Ca Sr Sb Mn Fe Ni RE Mg Sample 1 9.21 0.86 0.02 - - - 0.26 ⁇ 0.0005 ⁇ 0.0004 - Bal.
  • Sample 2 3.90 0.01 1.1 - - - 0.25 ⁇ 0.0005 ⁇ 0.0004 - Bal.
  • Sample 3 4.23 0.01 0.01 - - - 0.11 ⁇ 0.0005 ⁇ 0.0004 2.0 Bal.
  • Sample 4 3.52 0.01 0.92 0.61 0.41 - 0.15 ⁇ 0.0005 ⁇ 0.0004 0.5 Bal.
  • Sample 5 3.23 0.01 1.11 - 0.3 - 0.25 ⁇ 0.0005 ⁇ 0.0004 0.5 Bal.
  • Sample 6 3.21 0.01 1.06 0.71 - 0.2 0.27 ⁇ 0.0005 ⁇ 0.0004 0.5 Bal.
  • Sample 7 3.34 0.01 0.98 - - 0.3 0.27 ⁇ 0.0005 ⁇ 0.0004 0.5 Bal.
  • Fig. 4 shows the test results.
  • Sample 1 (AZ91D alloy) and sample 2 (AS41 alloy) have poor creep resistance.
  • Samples 4 to 7 (alloys according to the present invention) have creep resistance superior to sample 1 (AZ91D alloy) and sample 2 (AS41 alloy).
  • the experimental results for samples 4 and 6, which are alloys according to the present invention that have Ca added substantially overlap in Fig. 4, both of these samples show better creep resistance than sample 3 (AE42 alloy).
  • Samples with shape shown in Fig. 5 were made under the two sets of casting conditions shown in Table 2 using alloys with a variety of compositions. The presence of open cracks, closed cracks, and minute cracks was investigated.
  • the alloy composition of each sample used in the experiment is shown in Table 3.
  • Sample 1 is AZ91D alloy
  • sample 2 is AE42 alloy
  • samples 3 and 4 are alloys of the first embodiment of the present invention
  • samples 5 and 6 are alloys of the second embodiment of the present invention.
  • Conditions 1 of Table 2 are normally-used conditions and conditions 2 are normally not used.
  • the shape of the sample of Fig. 5 has a length of 105 mm at the parallel portion and has holding end portions. The holding end portions have angle portions R with a radius of curvature of 0mm or 2mm.
  • Sample 3 3.45 0.01 1.15 0.0005 0.0005 0.58 0.0005 0.5 0.5 - 0.10 Bal.
  • Sample 4 3.32 0.01 0.95 0.0005 0.0005 - 0.0005 0.4 0.5 - 0.20 Bal.
  • Sample 5 3.23 0.01 1.05 0.0005 0.0005 0.6 0.0005 - 0.5 0.3 0.25 Bal.
  • Sample 6 3.28 0.01 0.98 0.0005 0.0005 - 0.0005 - 0.5 0.3 0.25 Bal.
  • Alloys with the composition shown in Table 5 were cast under the conditions 1 shown in Table 2 and prepared samples (10mm x 20mm x 145mm) were used to evaluate corrosion resistance. The surface of the samples were wet polished with emery papers (#150, #400, # 800 and #2000). Corrosion resistance was performed for 65 hours using a salt containing water spray test (JIS Z2371) and corrosion rate (mg/day/dm 2 (MMD)) was measured. Alloy 1 is AZ91D alloy, alloy 2 is AE42 alloy, alloy 3 is AS41 alloy, alloy 4 and alloy 5 are alloys according to the first embodiment of the present invention, and alloy 6 and alloy 7 are alloys according to the second embodiment of the present invention.
  • alloys 4 to 7 indicate better corrosion resistance than alloy 3 (AS41 alloy).
  • Alloy 5 alloy according to the first embodiment of the present invention, one without Ca added
  • alloy 7 alloy according to the second embodiment of the present invention, one without Ca added
  • alloy 1 alloy 1
  • alloy 4 alloy according to the first embodiment of the present invention, one with Ca added
  • alloy 6 alloy according to the second embodiment of the present invention, one with Ca added

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Measurement Of Force In General (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP02251809A 2001-03-14 2002-03-06 Alliage de magnesium résistant au fluage Withdrawn EP1241276A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001072993A JP2002275569A (ja) 2001-03-14 2001-03-14 耐クリープＭｇ合金
JP2001072993 2001-03-14

Publications (1)

Publication Number Publication Date
EP1241276A1 true EP1241276A1 (fr) 2002-09-18

Family

ID=18930494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02251809A Withdrawn EP1241276A1 (fr) 2001-03-14 2002-03-06 Alliage de magnesium résistant au fluage

Country Status (4)

Country Link
US (1) US20030037846A1 (fr)
EP (1) EP1241276A1 (fr)
JP (1) JP2002275569A (fr)
CN (1) CN1382823A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004024967A1 (fr) * 2002-09-13 2004-03-25 Ryobi Ltd. Alliage de mg resistant au fluage

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100366775C (zh) * 2003-01-07 2008-02-06 死海鎂有限公司 高强度抗蠕变镁基合金
US8123877B2 (en) 2003-01-31 2012-02-28 Kabushiki Kaisha Toyota Jidoshokki Heat-resistant magnesium alloy for casting heat-resistant magnesium alloy cast product, and process for producing heat-resistant magnesium alloy cast product
CN100424209C (zh) * 2003-06-06 2008-10-08 中国第一汽车集团公司 新型抗高温蠕变压铸镁合金
CN100371486C (zh) * 2004-12-24 2008-02-27 北京有色金属研究总院 一种镁合金及其制备方法
CN100425720C (zh) * 2005-03-31 2008-10-15 鸿富锦精密工业（深圳）有限公司 抗蠕变镁合金材料
CN100449020C (zh) * 2005-09-30 2009-01-07 郑州大学 一种含铝镁合金稀土相的变质剂及其制备方法和应用
CN100336925C (zh) * 2005-11-17 2007-09-12 上海交通大学 Mg2Si/Mg－9Al－Y高阻尼复合材料的制备方法
CN100387742C (zh) * 2005-11-17 2008-05-14 上海交通大学 Mg2Si/Mg－9Al－Y高阻尼复合材料
CN100406159C (zh) * 2006-01-20 2008-07-30 中国科学院金属研究所 一种使Mg-Al-Zn基铸造镁合金获得高强度高韧性的方法
CN101871067B (zh) * 2009-04-24 2012-05-23 中国科学院金属研究所 一种锶变质含硅高强镁合金的制备方法
CN101805866B (zh) * 2010-04-21 2011-06-29 上海交通大学 用于高速挤压的变形镁合金及其制备方法
CN101818293B (zh) * 2010-04-21 2012-05-30 广州有色金属研究院 一种耐热镁合金
CN102994834B (zh) * 2011-09-09 2014-12-10 江汉大学 一种含Nb的耐热镁合金
CN108085549A (zh) * 2017-12-27 2018-05-29 哈尔滨理工大学 一种超声波辅助机械搅拌制备新型镁基复合材料的方法
JP7324978B2 (ja) * 2019-06-07 2023-08-14 株式会社戸畑製作所 マグネシウム合金およびマグネシウム合金を用いた鋳造構造部材

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147603A (en) * 1990-06-01 1992-09-15 Pechiney Electrometallurgie Rapidly solidified and worked high strength magnesium alloy containing strontium
JPH0711373A (ja) * 1993-06-28 1995-01-13 Ube Ind Ltd 耐熱性マグネシウム合金
JPH0841576A (ja) * 1994-07-28 1996-02-13 Honda Motor Co Ltd 高強度マグネシウム合金及びマグネシウム合金鋳物の熱処理方法
JPH08260090A (ja) * 1995-03-24 1996-10-08 Toyota Central Res & Dev Lab Inc ダイカスト性に優れたＭｇ−Ｓｉ−Ｃａ過共晶合金
EP0791662A1 (fr) * 1996-02-27 1997-08-27 Honda Giken Kogyo Kabushiki Kaisha Alliage de magnésium résistant à la chaleur
EP0799901A1 (fr) * 1996-04-04 1997-10-08 Mazda Motor Corporation Alliage à base de magnesium résistant à la chaleur
US5681403A (en) * 1993-06-28 1997-10-28 Nissan Motor Co., Ltd. Magnesium alloy
EP1048743A1 (fr) * 1999-04-30 2000-11-02 General Motors Corporation Pièces coulées en alliage de magnesium, résistantes au fluage
EP1127950A1 (fr) * 2000-02-24 2001-08-29 Mitsubishi Aluminum Co.,Ltd. Alliages de magnesium pour la coulee sous pression

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147603A (en) * 1990-06-01 1992-09-15 Pechiney Electrometallurgie Rapidly solidified and worked high strength magnesium alloy containing strontium
JPH0711373A (ja) * 1993-06-28 1995-01-13 Ube Ind Ltd 耐熱性マグネシウム合金
US5681403A (en) * 1993-06-28 1997-10-28 Nissan Motor Co., Ltd. Magnesium alloy
JPH0841576A (ja) * 1994-07-28 1996-02-13 Honda Motor Co Ltd 高強度マグネシウム合金及びマグネシウム合金鋳物の熱処理方法
JPH08260090A (ja) * 1995-03-24 1996-10-08 Toyota Central Res & Dev Lab Inc ダイカスト性に優れたＭｇ−Ｓｉ−Ｃａ過共晶合金
EP0791662A1 (fr) * 1996-02-27 1997-08-27 Honda Giken Kogyo Kabushiki Kaisha Alliage de magnésium résistant à la chaleur
EP0799901A1 (fr) * 1996-04-04 1997-10-08 Mazda Motor Corporation Alliage à base de magnesium résistant à la chaleur
EP1048743A1 (fr) * 1999-04-30 2000-11-02 General Motors Corporation Pièces coulées en alliage de magnesium, résistantes au fluage
EP1127950A1 (fr) * 2000-02-24 2001-08-29 Mitsubishi Aluminum Co.,Ltd. Alliages de magnesium pour la coulee sous pression

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 06 28 June 1996 (1996-06-28) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 02 28 February 1997 (1997-02-28) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004024967A1 (fr) * 2002-09-13 2004-03-25 Ryobi Ltd. Alliage de mg resistant au fluage

Also Published As

Publication number Publication date
JP2002275569A (ja) 2002-09-25
US20030037846A1 (en) 2003-02-27
CN1382823A (zh) 2002-12-04

Similar Documents

Publication Publication Date Title
EP3121302B1 (fr) Alliage d'aluminium pour coulée sous pression et alliage d'aluminium coulé sous pression l'utilisant
EP1241276A1 (fr) Alliage de magnesium résistant au fluage
CA2238070C (fr) Alliage de magnesium presentant une tenue amelioree aux temperatures elevees et une aptitude amelioree au moulage sous pression
US6767506B2 (en) High temperature resistant magnesium alloys
EP3175011B1 (fr) Alliages de magnésium ductiles et résistants au fluage pour coulée sous pression
WO1996025529A1 (fr) Alliages de magnesium resistant au fluage, pour la coulee sous pression
JP4526768B2 (ja) マグネシウム合金
JP5969713B1 (ja) ダイカスト用アルミニウム合金およびこれを用いたアルミニウム合金ダイカスト
EP1308530B1 (fr) Alliages de magnésium résistants au fluage avec une coulabilité améliorée
WO2005118900A1 (fr) Alliage de magnésium résistant au fluage
JP5383314B2 (ja) 耐クリープマグネシウム合金
AU2004274799B2 (en) Heat resistant magnesium die casting alloys
US10550453B2 (en) Heat-resistant magnesium alloy
JP2006176873A (ja) マグネシウム合金及びマグネシウム合金部材の製造方法
KR101325642B1 (ko) 크리프 특성이 우수한 주조용 마그네슘합금
JP3800345B2 (ja) ホットチャンバーキャスタブル亜鉛合金
KR102197773B1 (ko) 강도와 연신율이 우수한 고압 다이캐스팅용 마그네슘 합금 및 이 합금의 제조방법
US11959155B2 (en) Heat-resistant magnesium alloy for casting
WO2004024967A1 (fr) Alliage de mg resistant au fluage
KR20110135653A (ko) 크리프 특성이 우수한 주조용 마그네슘합금
KR20110093107A (ko) 크리프 특성이 우수한 주조용 마그네슘합금
JP2001316746A (ja) 高強度で耐摩耗性及び摺動性に優れたアルミニウム合金

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20021106

AKX Designation fees paid

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20041001