US20050220660A1 - Al-Si based alloy and alloy member made therefrom - Google Patents

Al-Si based alloy and alloy member made therefrom Download PDF

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Publication number
US20050220660A1
US20050220660A1 US11/092,978 US9297805A US2005220660A1 US 20050220660 A1 US20050220660 A1 US 20050220660A1 US 9297805 A US9297805 A US 9297805A US 2005220660 A1 US2005220660 A1 US 2005220660A1
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diecasting
content
alloy
mass
comparative
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US11/092,978
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Fumiaki Fukuchi
Takanori Yahaba
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUCHI, FUMIAKI, YAHABA, TAKANORI
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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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • 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
    • 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
    • B22D17/14—Machines with evacuated die cavity

Definitions

  • the present invention relates to an Al—Si based alloy and to an alloy member made of the Al—Si based alloy, and in particular, relates to a technique for producing an Al—Si based alloy which is produced by diecasting under a high vacuum and has good weldability.
  • Japanese Unexamined Patent Application Publication No. 7-91624 discloses a production method of aluminum alloy casting including a step for forming a casting by diecasting aluminum alloy, a step for coating on the casting, and a step for heating which bakes the coating on the coated casting and aging the casting at the same time, wherein the aluminum alloy includes, by weight, Si at 7.5 to 9.5%, Cu at 0.1 to 0.3%, Mg at 0.1 to 0.32%, Fe at 0.5 to 0.9%, Mn at 0.2 to 0.6%, and Sr at 0.03 to 0.05%, and the balance consisting of Al.
  • Japanese Unexamined Patent Application Publication No. 9-3610 discloses a production technique of aluminum diecasting products including a step for diecasting aluminum molten metal including Si at 5 to 13%, Mg at 0.5% or less, Mn at 0.1 to 1.0%, and Fe at 0.1 to 2.0%, a step of heating the diecasting product to 400 to 500° C., and a step for cooling to room temperature at a cooling rate of 10° C./sec or less, so that average particle size of the diecasting product is 20 ⁇ m or less.
  • diecasting products produced by these disclosed techniques has superior toughness, and moreover, fluidity is superior because the products have uniform alloy which exists in a region from the Al—Si hypo eutectic region to the eutectic region.
  • the products made of these alloys do not exhibit superior weldability.
  • FIG. 1 is a side view showing a welding state of alloy members consisting of Al—Si based alloy.
  • the throat thickness is the largest height 2 in the protruding portion of weld metal 1 (shaded portion) which exists in a welded portion
  • the leg length is lengths 3 and 4 in each direction of the contact portion between the base metal (each Al—Si based alloy) and weld metal 1 .
  • the present invention was completed in view of the above circumstances, and objects of the present invention are therefore to provide an Al—Si based alloy and an alloy member made of the alloy, in which when alloys produced by diecasting under high vacuum conditions are welded, weldability can be improved without increasing plate thickness of welded portions and gas content is reduced in diecasting.
  • the present inventors researched Al—Si based alloys and alloy members made of the alloy, which is produced by diecasting under high vacuum conditions and exhibits superior weldability, as described above. As a result, it was concluded that according to the Al—Si based alloy, superior weld beads can be formed and preferable weld strength, that is, sufficient weldability, can be thereby obtained, by the following known facts shown in 1) to 4).
  • FIG. 2 is a graph showing the relationship between the liquid phase rate and temperature in welding in connection with each Si content in an Al—Si based alloy.
  • the Si content in the Al—Si based alloy is controlled to within 7.5 to 9.0 mass %, viscosity in melting can be sufficiently ensured, and solidifying time of the weld bead can be shortened by increasing the liquid temperature and the solid temperature.
  • throat thickness and leg length can be sufficiently ensured by preventing flowing out of weld metal, and bubbling of microbubbles of gas due to dissolving, generating and accumulating of hydrogen gas is prevented by crystallization of solid phase and blowhole in the weld bead can also thereby be prevented from forming. Therefore, weldability can be improved.
  • the alloy can be prevented from adhering to and burning in the metal mold, even if molten metal temperature, casting speed, and casting pressure are increased in order to compensate for fluidity in diecasting.
  • Ti not be contained as a constituent element of the alloy in order to attempt to improve toughness.
  • the present invention was completed in view of the above knowledge.
  • an Al—Si based alloy according to the present invention includes Si at 7.5 to 9.0 mass %, Mg at 0.2 to 0.4 mass %, Mn at 0.3 to 0.5 mass %, Cu at 0.03 to 0.2 mass %, Fe at 0.1 to 0.25 mass %, Sr at 0.005 to 0.02 mass %, and the balance consisting of Al and inevitable impurities.
  • the Al—Si based alloy include Si at 7.5 to 8.5 mass %, Mg at 0.2 to 0.3 mass %, and Mn at 0.3 to 0.4 mass %.
  • an Al—Si based alloy which exhibits superior weldability in diecasting under high vacuum conditions can be obtained by optimizing of contents of Si, Mg, Mn, Cu, Fe, and Sr which are constituent elements in the alloy.
  • the alloy members of the present invention are preferably employed as members for various processing since toughness is high as that of conventional alloy members and weldability is also high.
  • welding processes can be rationalized in welding of the alloy members of the present invention, since plate thickness can be decreased as described above, etc. Additionally, diecasting process can also be rationalized since the contained gas amount in diecasting is increased.
  • FIG. 1 is a side view showing a welding state of alloy members consisting of an Al—Si based alloy.
  • FIG. 2 is a graph showing the relationship between the liquid phase rate and temperature in welding in connection with each Si content in the Al—Si based alloy.
  • FIGS. 3A to 3 C are graphs showing mechanical properties in the case in which molten metal of each Al—Si—Mg alloy in which Mg content was set to a desired value and Si content was changed was cast in a metal mold for an ASTM test piece by a 200-ton diecasting machine, respectively, and then a test piece for tension test was processed, and subsequently, a tension test was carried out without heating.
  • FIG. 3A shows tensile strength
  • FIG. 3B shows proof stress
  • FIG. 3C shows elongation.
  • FIGS. 4A to 4 C are graphs showing mechanical properties in the case in which molten metal of each Al—Si—Mg alloy in which Si content was set to a desired value and Mg content was changed was cast in a metal mold for an ASTM test piece by a 200-ton diecasting machine, respectively, and then a test piece for tension test was processed, and subsequently, a tension test was carried out without heating.
  • FIG. 4A shows tensile strength
  • FIG. 4B shows proof stress
  • FIG. 4C shows elongation.
  • FIG. 5 is a plane view showing a test piece for tension test cut down from each plate-shaped diecasting product (Examples 1 to 5 and Comparative Examples 6 to 12 of the present invention).
  • FIG. 6 is a side view showing a point of welding and a point of measurement of throat thickness and blowhole in the Examples.
  • FIGS. 3A to 3 C are graphs showing the relationships of tensile strength, proof stress and elongation in the case in which molten metal of each Al—Si—Mg alloy in which Mg content was set to a desired value and Si content was changed was cast in a metal mold for an ASTM test piece by a 200-ton diecasting machine, respectively, then a test piece for tension test was processed, and subsequently, a tension test was carried out without heating.
  • the Si content is 7.5 mass % or more
  • fluidity of molten metal in diecasting is superior and mechanical properties such as tensile strength, proof stress, etc., are thereby superior.
  • the Si content is set to be 7.5 to 9.0 mass %.
  • Si content is 8.5 mass % or less, since elongation can be ensured at a higher level.
  • FIGS. 4A to 4 C are graphs showing the relationships of tensile strength, proof stress and elongation in the case in which molten metal of each Al—Si—Mg alloy in which Si content was set to a desired value and Mg content was changed was cast in a metal mold for an ASTM test piece by a 200-ton diecasting machine, respectively, then a test piece for tension test was processed, and subsequently, tension test was carried out without heating.
  • Mg is contained in order to improve mechanical properties such as tensile strength and proof stress, as well as Si.
  • FIGS. 4A to 4 C when Mg content is less than 0.2 mass %, the improving effect of the above mechanical properties is low.
  • the Mg content is set to be 0.2 to 0.4 mass %.
  • Mg content it is preferable that Mg content be 0.3 mass % or less, since elongation can be ensured at a higher level.
  • the tensile strength is easily affected by the Mg content more than the Si content.
  • the Si content is 9.0 mass % or 10.0 mass %
  • the tensile strength increases in proportion to Mg content; however, when the Si content is less than 7.5 mass %, the tensile strength is rapidly lowered.
  • the Si content be 7.5 mass % or more and the Mg content be 0.2 mass % or more.
  • the proof stress is also easily affected by the Mg content more than of the Si content.
  • the Si content is 9.0 mass % or 10.0 mass %, superior proof stress is exhibited; however, there is less difference of tensile strength than that of proof stress between these contents and there is less difference when the Si content is 7.5 mass % or more.
  • the elongation is easily affected by not only the Mg content but also the Si content. That is, the elongation tends to be in inverse proportion to the Si content, and the less the Si content, the larger the elongation.
  • the Mg content be within 0.2 to 0.4 mass %.
  • Mn is contained in order to suppress that toughness such as elongation is decreased by Fe compound which is a needle coarse crystal deposited in diecasting.
  • the Mn content is set to be 0.3 to 0.5 mass %.
  • the Mn content be 0.4 mass % or less, since intermetallic compound is prevented from being produced and the elongation can be sufficiently ensured.
  • Cu is contained in order to improve tensile strength and proof stress.
  • high purity Al mother alloy must be used in diecasting, and in addition, the cleanliness of the fusion furnace and the holding furnace must be more precisely controlled than those of conventional methods, and producing cost is increased.
  • the content exceeds 0.2 mass %, by affecting the Si content, toughness such as the elongation lowering and moreover, corrosion resistance are deteriorated. Therefore, the Cu content is set to be 0.03 to 0.2 mass %.
  • Fe content is less than 0.1 mass %, high purity Al mother alloy must be used in diecasting, and in addition, the cleanliness of fusion furnace and holding furnace must be more precisely controlled than those of conventional methods, and producing cost is increased.
  • the Fe content exceeds 0.25 mass %, Fe compound is deposited as a needle coarse crystal in diecasting, and toughness such as elongation is decreased. Therefore, the Fe content is set to be 0.1 to 0.25 mass %.
  • Sr is contained in order to fine Si particles deposited in diecasting. Since the Si content is 9.0 mass % or less, when the Sr content is less than 0.005 mass %, the above fining effect is not obtained. In contrast, when the Sr content exceeds 0.02 mass %, the above fining effect is saturated and it is difficult to obtain further effects, and consequently, yield is deteriorated. Therefore, the Sr content is set to be 0.005 to 0.02 mass %.
  • Alloys having the compositions shown in Table 1 were dissolved at 720° C., respectively and then were deoxidized and degassed by molten metal treatment using Ar gas and flux. Next, under a vacuum condition at an internal pressure of a metal mold of 5 kPa and at molten metal temperature 700° C., the alloys were cast using a metal mold for plate-shaped diecasting having width of 100 mm, depth of 300 mm, and height of 5 mm, and plate-shaped diecasting products having each composition shown in Table 1 (Examples 1 to 5 and Comparative Examples 6 to 12 of the present invention) were thereby obtained. Here, temperature of the metal mold was 150° C.
  • test pieces for a tensile test having sizes shown in FIG. 5 were cut out from the center of the product, and test pieces (plate thickness of 2.5 mm with U-shaped notch) for a Charpy impact test shown in JIS Z2242 were cut out.
  • the test pieces were subjected to normal temperature tensile test using a 5-ton tensile testing machine and a Charpy impact test using a 5-kg-m Charpy impact testing machine.
  • each diecasting product of Examples 1 to 5 exhibited superior results about not only tensile strength, proof stress and elongation but also impact value to those of each diecasting product of Comparative Examples 6 to 12.
  • each diecasting product was subjected to an evaluation about weldability.
  • the welding was carried out according to the model figure shown in FIG. 6 .
  • numeral reference B showed total throat thickness (minimum thickness in building up portion by overlaying), and numeral reference Bb showed blowhole thickness.
  • each diecasting product of Examples 1 to 5 and Comparative Examples 6 to 12 was used for a top plate, and T1 thickness of the plate was 4 mm.
  • A5052P-O product was used for a bottom plate, and T2 thickness of the plate was 3 mm.
  • throat thickness B (mm) and blowhole thickness Bb (mm) in the case in which the contained gas amount were different (2 cc/100 g and 8 cc/100 g) were measured at positions shown in FIG. 6 .
  • the results are shown in Table 3.
  • Si—Al based alloy of the present invention in the case in which diecasting is carried out under high vacuum condition, weldability can be improved without increasing plate thickness of welding portion or reducing contained gas amount in diecasting. Therefore, the present invention is preferable to use as a various member in which more superior weldability will be required in the future.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Arc Welding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
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JP2004101044A JP2005281829A (ja) 2004-03-30 2004-03-30 Ａｌ−Ｓｉ系合金及びこの合金からなる合金部材
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060137774A1 (en) * 2004-12-28 2006-06-29 Denso Corporation Aluminum alloy for die castings and production process of aluminum alloy castings
US20090230108A1 (en) * 2006-07-11 2009-09-17 Yorozu Corporation Welding method and welded article
US20090314392A1 (en) * 2008-06-24 2009-12-24 Bdw Technologies Gmbh Cast component and method for the production thereof
CN104388770A (zh) * 2014-11-19 2015-03-04 无锡鸿声铝业有限公司 一种铝合金
CN104630576A (zh) * 2014-12-29 2015-05-20 江苏中色锐毕利实业有限公司 一种导热性能优异的亚共晶铝硅合金及其制备方法与应用
CN112626390A (zh) * 2021-01-07 2021-04-09 重庆慧鼎华创信息科技有限公司 一种高延伸率压铸铝合金及其制备方法

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Publication number Priority date Publication date Assignee Title
DE102006032699B4 (de) * 2006-07-14 2010-09-09 Bdw Technologies Gmbh & Co. Kg Aluminiumlegierung und deren Verwendung für ein Gussbauteil insbesondere eines Kraftwagens
JP2011208253A (ja) * 2010-03-30 2011-10-20 Honda Motor Co Ltd 車両材料用アルミダイカスト合金
JP2013204087A (ja) * 2012-03-28 2013-10-07 Honda Kinzoku Gijutsu Kk 高強度高熱伝導性アルミニウム合金部材とその製造方法
JP6523681B2 (ja) * 2014-12-25 2019-06-05 株式会社Uacj ケース用アルミニウム合金板及びケース
CN106811624A (zh) * 2015-12-01 2017-06-09 镇江市润州金山金属粉末厂 一种新型铝锶合金
KR102572624B1 (ko) * 2023-04-11 2023-08-31 동남정밀 주식회사 비열처리용 고연신율 다이캐스팅 합금 조성물

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US6562155B1 (en) * 2000-05-08 2003-05-13 Kyusyu Mitsui, Aluminum Co., Ltd. Process for producing aluminum alloy semi-molten billet for use as transportation unit
US20050167012A1 (en) * 2004-01-09 2005-08-04 Lin Jen C. Al-Si-Mn-Mg alloy for forming automotive structural parts by casting and T5 heat treatment
US20050199318A1 (en) * 2003-06-24 2005-09-15 Doty Herbert W. Castable aluminum alloy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6562155B1 (en) * 2000-05-08 2003-05-13 Kyusyu Mitsui, Aluminum Co., Ltd. Process for producing aluminum alloy semi-molten billet for use as transportation unit
US20050199318A1 (en) * 2003-06-24 2005-09-15 Doty Herbert W. Castable aluminum alloy
US20050167012A1 (en) * 2004-01-09 2005-08-04 Lin Jen C. Al-Si-Mn-Mg alloy for forming automotive structural parts by casting and T5 heat treatment

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060137774A1 (en) * 2004-12-28 2006-06-29 Denso Corporation Aluminum alloy for die castings and production process of aluminum alloy castings
GB2421735A (en) * 2004-12-28 2006-07-05 Denso Corp Aluminium-silicon casting alloy
GB2421735B (en) * 2004-12-28 2008-10-15 Denso Corp Aluminium alloy for die castings and production process of aluminium alloy castings
US20090032209A1 (en) * 2004-12-28 2009-02-05 Takeshi Nagasaka Aluminum alloy for die castings and production process of aluminum alloy castings
US20090230108A1 (en) * 2006-07-11 2009-09-17 Yorozu Corporation Welding method and welded article
US8101886B2 (en) * 2006-07-11 2012-01-24 Yorozu Corporation Welding article and welding method of carrying out an alternating current arc welding
US20090314392A1 (en) * 2008-06-24 2009-12-24 Bdw Technologies Gmbh Cast component and method for the production thereof
EP2138593A2 (de) * 2008-06-24 2009-12-30 BDW technologies GmbH Gussbauteil und Verfahren zu dessen Herstellung
EP2138593A3 (de) * 2008-06-24 2010-10-27 BDW technologies GmbH Gussbauteil und Verfahren zu dessen Herstellung
CN104388770A (zh) * 2014-11-19 2015-03-04 无锡鸿声铝业有限公司 一种铝合金
CN104630576A (zh) * 2014-12-29 2015-05-20 江苏中色锐毕利实业有限公司 一种导热性能优异的亚共晶铝硅合金及其制备方法与应用
CN112626390A (zh) * 2021-01-07 2021-04-09 重庆慧鼎华创信息科技有限公司 一种高延伸率压铸铝合金及其制备方法

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JP2005281829A (ja) 2005-10-13

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