Classifications

• • 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
• • 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
  • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
• • 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
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
  • F02F3/0084—Pistons  the pistons being constructed from specific materials

Definitions

• the present invention relates to a method for producing a material based on an aluminum alloy according to the preamble of claim 1, a material obtainable with this method and the use of this material.
• pistons have typically been made from cast aluminum-silicon alloys. Because of the good casting properties, pistons based on aluminum-silicon alloys can be manufactured relatively cheaply and easily using the permanent mold casting process.
• These materials are typically with silicon contents between 12 and 18 wt .-%, in individual cases also up to 24 wt .-%, and with admixtures of magnesium between 1 to 1.5 wt .-%, copper between 1 and 3 wt .-% % and often nickel alloyed between 1 to 3 wt .-%.
• z. B. according to US Pat. No. 6,419,769 A1 recommends setting the copper content between 5.6 and 8.0% by weight.
• FR 2 690 957 A1 the strength of such an alloy is further increased by adding the elements titanium, zirconium and vanadium. However, the alloying of these strength-increasing elements increases the density of the material.
• a heat-resistant alloy with a reduced specific weight is described in patent specification DE 747 355 as being particularly advantageous for pistons.
• This material is characterized by a magnesium content between 4 and 12 wt .-% and a silicon content between 0.5 and 5 wt .-%, the silicon content should always be less than half the magnesium content. Furthermore, between 0.2 and 5% by weight of copper and / or nickel are added. Even without the addition of strength-enhancing components, this material should be characterized by improved heat resistance.
• the magnesium is therefore added depending on the silicon content desired in each case according to the above formula. Some of the magnesium (1.73xSi content) reacts directly with silicon to form magnesium silicide, the remaining 1.5 to 6.0% by mass of magnesium dissolve in the aluminum mixed crystal and, after suitable heat treatment together with copper, increase the strength of the material.
• the material can contain the usual impurities in aluminum alloys. In addition, the alloying of further alloying elements could appear sensible for the purpose of further strengthening. It is known e.g.
• the material obtainable by the process according to the invention is distinguished by excellent strength properties which, even at elevated temperatures, prove to be superior to the piston alloys customary today.
• Advantageous further developments result from the subclaims.
• the base alloy can be treated with all known hot forming processes, for example extrusion, hot rolling or forging. Hot forming should be carried out with a degree of deformation greater than 5 times.
• the aluminum or base alloy used should only contain a small proportion of foreign elements, and not more than 1% by mass per foreign element.
• a heat treatment is advantageously carried out after the hot shaping. This can be done in a manner known per se by solution annealing, quenching and hot aging.
• the material according to the invention is suitable for the production of all types of components, in particular pistons for internal combustion engines.
• the resulting raw material is pre-heated to 400 to 500 ° C warms and 10 times formed by extrusion and then hardened. For this purpose, a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out
• a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out.
• Beryllium is added to reduce the tendency of the melt to oxidize.
• Magnesium phosphate is used to refine the grain of the primarily solidifying magnesium silicide. Iron was analyzed as an impurity.
• the finished material shows the following properties:
• the material according to the invention is distinguished from the British aluminum standard 2618 by a lower density and an increased modulus of elasticity.
• the static strength properties achieved match the high-strength wrought alloy 2618.
• the fatigue strength determined clearly exceeds the values achieved with the wrought alloy 2618.
• the material according to the invention is superior in both static and dynamic testing. This combination of properties makes it particularly suitable for the manufacture of pistons for internal combustion engines.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Powder Metallurgy (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Extrusion Of Metal (AREA)
• Forging (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34801930

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (16)

Citations (6)

Family Cites Families (6)

• 2004
  • 2004-02-16 DE DE102004007704A patent/DE102004007704A1/de not_active Ceased
• 2005
  • 2005-02-15 EP EP05714972.6A patent/EP1718778B1/de not_active Expired - Lifetime
  • 2005-02-15 KR KR1020067016815A patent/KR101220577B1/ko not_active Expired - Fee Related
  • 2005-02-15 WO PCT/DE2005/000254 patent/WO2005078147A1/de not_active Ceased
  • 2005-02-15 CN CNB2005800049055A patent/CN100503857C/zh not_active Expired - Fee Related
  • 2005-02-15 US US10/589,215 patent/US7892482B2/en not_active Expired - Lifetime
  • 2005-02-15 BR BRPI0507719-2B1A patent/BRPI0507719B1/pt not_active IP Right Cessation
  • 2005-02-15 JP JP2006553426A patent/JP4914225B2/ja not_active Expired - Fee Related

Patent Citations (7)

Non-Patent Citations (1)

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