EP1190107B1 - Aluminum-base alloy for cylinder heads - Google Patents
Aluminum-base alloy for cylinder heads Download PDFInfo
- Publication number
- EP1190107B1 EP1190107B1 EP00926595A EP00926595A EP1190107B1 EP 1190107 B1 EP1190107 B1 EP 1190107B1 EP 00926595 A EP00926595 A EP 00926595A EP 00926595 A EP00926595 A EP 00926595A EP 1190107 B1 EP1190107 B1 EP 1190107B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- alloys
- weight
- magnesium
- copper
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- C22C21/04—Modified aluminium-silicon alloys
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0469—Other heavy metals
- F05C2201/0475—Copper or alloys thereof
Definitions
- Automotive engine cylinder heads are usually manufactured by casting process in alloys of the Ahmainum-Silicon-Copper class. When the mechanical load imposed on the cylinder heads is extreme, the use of heat treatments becomes necessary as a means of improving the qualities of the alloys.
- the present invention concerns an alloy of the Aluminum-Silicon-Copper class improved for the production of the said cylinder heads, presenting better mechanical properties than those obtained in the alloys traditionally used, thus doing away with the need for heat treatment.
- the alloys used for the manufacture of cylinder heads with or without heat treatment are basically the same, differing only in the magnesium contents, lower than 0.20% for non-treated alloys, and lying between 0.30% and 0.50% for treated alloys. This increase in the magnesium content helps the response to the heat treatment, so that increases of hardness and mechanical resistance are obtained. Typical specifications of the aluminum alloys most often used in the production of automotive cylinder heads.
- Table II shows the minimal mechanical property values obtained in these alloys when they are cast in sand molds in the rough casting state and after the solution and precipitation heat treatment (T6).
- An alternative serving to improve the mechanical properties of the pieces without raising the cost of the final product would be to increase the speed of cooling during the solidification of the aluminum alloys. Since most cylinder heads are produced by casting in metal molds, containing some cores of sand in order to form the internal cavities, an increase in the speed of cooling might be obtained by means of the forced cooling of the metal molds. It is important to point out that this procedure improves the properties only of the regions that are in contact with the cooled metal molds, and, even so, its action is limited only to the superficial layer of the piece.
- the present invention concerns an alloy that is modified in relation to those that are traditionally used in the production of cylinder heads, and presents, in the rough casting stage, mechanical properties similar to those obtained in pieces after the heat treatment.
- the document DATABASE WPI Section Ch, Week 199848 Derwent Publications Ltd., London, GB; Class M26, AN 1998-563579 and JP-A-10 251790 discloses an aluminum-base alloy for the production of engine cylinder heads containing, in weight %, Si from 4.0% to 10.0%, Cu from 0% to 5.0%, Mg from 0% to 1.0%, balance Al.
- the document US-A-4 336 076 describes an engine cylinder block made of an aluminum alloy containing in weight 4 to 14% of Si, 1 to 5% of Cu and 0.2 to 0.8% of Mg.
- Method of manufacturing the cylinder block includes a heat treatment step after moulding of such aluminum alloy.
- the microstructures of the alloys traditionally used in the production of cylinder heads are constituted by the ⁇ phase (dendrites), the ⁇ +Si eutectic, copper-rich eutectics, and intermetallic phases rich in iron, of the Al 5 FeSi and Al 15 (Fe,Mn) 3 Si 2 kinds.
- the alloy that is the subject matter of this invention is described in Table IV. Specification of the alloy that is the subject matter of this invention, to be used in the production of automotive cylinder heads, without the need for heat treatments.
- the specified contents of copper and magnesium are higher than those of the alloys traditionally used in this application.
- Figures 1a and 1b show the general appearance of the microstructure of alloy B with a copper content of 4.5%, by weight, and a magnesium content of 0.7%, by weight, respectively, and Figures 2a and 2b show the detailed appearance of the eutectic that is rich in copper and magnesium respectively.
- the aim is, by means of an increase of the copper and magnesium contents, to increase the volumetric fraction of hard phases without impairing the casting characteristics of the alloys.
- Colwell and Kissling (2) studied the addition of magnesium from 0% to 0.6% in aluminum alloys, having observed results showing increasing mechanical resistance.
- Hardening by the natural precipitation of coherent phases - Trela (3) mentions the existence of Al-Zn alloys developed in the 1950s which present a natural hardening, i.e., self aging, without the need for heat treatments. These alloys contain roughly 7% to 8% zinc, by weight; 0.4% magnesium, by weight; and 0.5% to 0.8% copper, by weight. With this composition, the principal difficulty in its use would be the low fusibility.
- Figure 3 shows the evolution of hardness figures in test specimens cast in sand molds in respect of the alloys described in Table IV, without the presence of magnesium, when the copper content was raised.
- the figures presented show hardness results right after the casting (on the outset of the natural precipitation), and after 5 days (at the end of the natural precipitation).
- Figure 4 presents the evolution of the hardness figures in sand-mold-cast test specimens in respect of the alloys described in Table IV without the presence of copper, when the content of magnesium was increased.
- the figures presented show hardness results right after the casting (on the outset of the natural precipitation), and after 5 days (at the end of the natural precipitation).
- Figure 5 presents the evolution of the hardness values with the rising content of magnesium in respect of the alloys described in Table IV with a 4.5% copper content.
- the figures presented show hardness results right after the casting, and after 2 days.
- This invention concerns an aluminum-base alloy, the principal elements of which are silicon, copper and magnesiunL
- the limits of chemical composition established for this alloy are described in detail in Table IV.
- This alloy is that of the manufacture of automotive engine cylinder heads in the rough casting state (without heat treatments).
- Figure 6 presents a typical differential thermal analysis curve of the traditional B alloy (Table I) and its derived curve (shown in the hatched line).
- the solidification reactions are evidenced by increases in the differences of temperature between the sample and the standard, that is, since the figures are negative, the reactions correspond to the slumps in the DTA curve (from the points of maximum values of the DTA to the troughs).
- the derivative curve can also be used to determine the regions of occurrence of reactions, being represented by values of the derivative above zero (peaks).
- Figure 7 presents the differential thermal analysis curves of two samples of the alloy described in Table IV with a copper content of 4.2% and a magnesium content of 0.75%. The curves obtained with the two specimens are very similar, showing the reproducibility of the results.
- Table V shows the principal reactions that occur during the solidification of the alloy described in Table IV.
- Table VI presents the volumetric fractions that occur at each one of the solidification stages of the alloys of the traditional B and of the modified kinds with a copper content of 4.5% and a magnesium content of 0.7%. Description of the principal reactions that occur during the solidification of the type B alloy (Table I) modified by higher contents of copper and magnesium.
- Stages Predominant phase* Volumetric fraction (%) Traditional B type alloy (Table I) B type alloy with 4.5% Cn + 0.7% Mg (Table IV) Stage 1 Phase ⁇ dendrites 38 43 Stage 2 ( ⁇ +Si) eutectic 59 39 Stage 3 ( ⁇ +Al 5 Mg 8 Cu 2 Si 6 ) eutectic 1 2 Stage 4 ( ⁇ +CuAl 2 +Al 5 Mg 8 Cu 2 Si 6 ) eutectic 2 16
- This phenomenon is usually explained as being, the consequence of the metastability of the maintenance of certain alloying elements in a solid solution in the aluminum in the post-casting state.
- Figure 9 show the curves of hardness evolution resulting from the natural precipitation in respect of three room temperatures applied. The results are very similar, showing that temperature variations between 5°C and 35°C effect only a very small change in the kinetics of natural precipitation and in the level of hardness reached at the end of the precipitation process.
- Table VII presents the typical mechanical results obtained in the production of cylinder heads with the modified B-type alloy, with copper contents of roughly 4.5% and magnesium contents of roughly 0.7%.
- the results in respect of the limits of resistance were obtained on the basis of tensile tests of test specimens cast according to the ASTM B 108 standard.
- the hardness results were obtained by means of direct measurements of the cylinder head faces, on two surfaces: in contact with a metallic mold and in contact with sand cores.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
Typical specifications of the aluminum alloys most often used in the production of automotive cylinder heads. | ||||||||
Alloy | Si (%) | Cu (%) | Mg (%) | Fe (%) | Mn (%) | Ni (%) | Zn (%) | Ti (%) |
A | 5.5-6.5 | 3.0-4.0 | <0.5 | <0.6 | <0.3 | <0.1 | <1.0 | <0.25 |
B | 8.0-10.0 | 2.5-4.0 | <0.5 | <0.6 | <0.3 | <0.1 | <1.0 | <0.25 |
All the percentages refer to weight; the % of Al corresponds to the balance that makes up 100% of the alloy |
Typical mechanical properties achieved by the alloys in Table I when cast in sand molds in the rough casting state (CS) and after solution and aging heat treatment. (T6). | |||||
Alloy | State | Tensile Strength (MPa) | 0.2% Proof Stress (MPa) | Elongation (%) | Hardness (HB) |
A | CS | 180 | 120 | 2.0 | 70 |
T6 | 250 | 160 | 2.0 | 80 | |
B | CS | 190 | 125 | 2.0 | 70 |
T6 | 250 | 170 | 2.0 | 80 |
Minimal mechanical properties obtained in the alloys used in the manufacture of cylinder heads when cooled in water-cooled metal molds. | ||||
Alloy | Tensile Strength (MPa) | 0.2% Proof Stress (MPa) | Elongation (%) | Hardness (HB) |
A | 230 | 1.30 | 2.5 | 85 |
B | 240 | 140 | 2.0 | 85 |
Specification of the alloy that is the subject matter of this invention, to be used in the production of automotive cylinder heads, without the need for heat treatments. The specified contents of copper and magnesium are higher than those of the alloys traditionally used in this application. | |||||||||||
Alloy | Si(%) | Cu(%) | Mg(%) | Fe (%) | Mn (%) | Ni (%) | Zn (%) | Ti (%) | Sn | Sr | Na |
modified | 5.0-10.0 | 4.0-6.0 | 0.6-1.0 | <0.7 | <0.3 | <0.1 | <1.0 | <0.25 | <0.20 | <0.02 | <0.02 |
Description of the principal reactions that occur during the solidification of the type B alloy (Table I) modified by higher contents of copper and magnesium. | ||
Stages | Temperature | Reactions and Phases Formed |
581°C | Beginning of the | |
Stage | ||
1 | 581 - 570°C | L → α (dendrites) + Phases rich in |
Stage | ||
2 | 550 - 530°C | L → α + Si (principal eutectic) + Phases rich in Fe |
Stage 3 | 510-505°C | L → α + Al5Mg8 + Cu2Si6 (secondary eutectic)+ Phases rich in |
Stage | ||
4 | 495 - 490°C | L → α + CuAl2 + Al5Mg8Cu2Si6 (secondary eutectic)+ Phases rich in Fe |
490°C | End of solidification |
Volumetric fractions of the products of each one of the solidification reactions of the conventional R15 and spaniel R15 alloys. | |||
Stages | Predominant phase* | Volumetric fraction (%) | |
Traditional B type alloy (Table I) | B type alloy with 4.5% Cn + 0.7% Mg (Table IV) | ||
| Phase α dendrites | 38 | 43 |
Stage 2 | (α+Si) eutectic | 59 | 39 |
Stage 3 | (α+Al5Mg8Cu2Si6) eutectic | 1 | 2 |
Stage 4 | (α+CuAl2+Al5Mg8Cu2Si6) eutectic | 2 | 16 |
Typical mechanical results obtained in the production of cylinder heads with the modified B-type alloy, with copper contents of roughly 4.5% and magnesium contents of roughly 0.7%. | |||||||||||||||
Test | Typical Results | ||||||||||||||
Tensile Strength (MPa) | 214 | 222 | 230 | 203 | 208 | 219 | 218 | 234 | 220 | 204 | 219 | 222 | 220 | 225 | 225 |
Metallic face hardness (HB) | 86 | 86 | 84 | 87 | 86 | 88 | 86 | 83 | 84 | 85 | 86 | 84 | 86 | 87 | 86 |
Sand face hardness (HB) | 80 | 81 | 82 | 81 | 80 | 81 | 82 | 82 | 84 | 82 | 81 | 82 | 81 | 81 | 81 |
Claims (1)
- Aluminum-base alloy for the production of engine cylinder heads without heat treatment, characterized by the fact that it contains as alloying elements: silicon, in contents varying between 5.0% and 10.0%, by weight; copper, in contents varying between 4.0% and 6.0%, by weight; magnesium, in contents varying between 0.6% and 1.0%, by weight; iron, with a content of less than 0.7%, by weight; manganese, with a content of less than 0.3%, by weight; nickel, with a content of less than 0.1%, by weight; zinc, with a content of less than 1.0%, by weight; titanium, with a content of less than 0.25%, by weight; strontium and/or sodium, with a content of less than 0.02%, by weight; and tin, with a content of less than 0.20%, by weight; the balance being aluminum and unavoidable impurities.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9901553-6A BR9901553A (en) | 1999-05-19 | 1999-05-19 | Aluminum-based alloy for the production of engine heads without heat treatment |
BR9901553 | 1999-05-19 | ||
PCT/BR2000/000056 WO2000071765A1 (en) | 1999-05-19 | 2000-05-19 | Aluminum-base alloy for cylinder heads |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1190107A1 EP1190107A1 (en) | 2002-03-27 |
EP1190107B1 true EP1190107B1 (en) | 2003-03-05 |
Family
ID=4072293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00926595A Expired - Lifetime EP1190107B1 (en) | 1999-05-19 | 2000-05-19 | Aluminum-base alloy for cylinder heads |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1190107B1 (en) |
AU (1) | AU4529400A (en) |
BR (1) | BR9901553A (en) |
DE (1) | DE60001577T2 (en) |
WO (1) | WO2000071765A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108265205A (en) * | 2018-01-29 | 2018-07-10 | 铜陵市腾发铝制品加工有限责任公司 | A kind of light-weight environment-friendly aluminium alloy and its preparation process |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100435375B1 (en) * | 2001-12-20 | 2004-06-10 | 현대자동차주식회사 | Composition of alloy for cylinder head improved strength and fatigue with high-frequency |
KR20030051051A (en) * | 2001-12-20 | 2003-06-25 | 현대자동차주식회사 | Composition of alloy for cylinder head improved strength and fatigue with high-frequency |
KR20030083146A (en) * | 2002-04-19 | 2003-10-30 | 현대자동차주식회사 | Composition of aluminum alloy for cylinder head with improved strength and high temperature properties |
KR20030092718A (en) * | 2002-05-31 | 2003-12-06 | 현대자동차주식회사 | Aluminium alloy for cylinder head of diesel engine |
DE102006059899A1 (en) * | 2006-12-19 | 2008-06-26 | Bayerische Motoren Werke Ag | High temperature resistant aluminum casting alloy for use in engine core construction units, ingot pouring, engine block, cylinder head, crankcase and in automotive industry, consists of various metals |
CN109957683A (en) * | 2017-12-25 | 2019-07-02 | 比亚迪股份有限公司 | A kind of high strength die-casting aluminum alloy and its preparation method and application |
US20240018631A1 (en) * | 2020-12-07 | 2024-01-18 | Norsk Hydro Asa | A high temperature stable alsicu alloy |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53115407A (en) * | 1977-03-17 | 1978-10-07 | Mitsubishi Keikinzoku Kogyo Kk | Engine cylinder block and the manufacture thereof |
JP3513281B2 (en) * | 1995-08-17 | 2004-03-31 | ヤンマー株式会社 | Pressure-resistant and high-strength aluminum casting method |
JPH09263867A (en) * | 1996-01-24 | 1997-10-07 | Mitsubishi Chem Corp | Aluminum alloy for casting |
JPH10251790A (en) * | 1997-03-13 | 1998-09-22 | Hitachi Metals Ltd | Aluminum alloy casting excellent in thermal fatigue strength |
-
1999
- 1999-05-19 BR BR9901553-6A patent/BR9901553A/en not_active IP Right Cessation
-
2000
- 2000-05-19 EP EP00926595A patent/EP1190107B1/en not_active Expired - Lifetime
- 2000-05-19 WO PCT/BR2000/000056 patent/WO2000071765A1/en active IP Right Grant
- 2000-05-19 DE DE60001577T patent/DE60001577T2/en not_active Expired - Lifetime
- 2000-05-19 AU AU45294/00A patent/AU4529400A/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108265205A (en) * | 2018-01-29 | 2018-07-10 | 铜陵市腾发铝制品加工有限责任公司 | A kind of light-weight environment-friendly aluminium alloy and its preparation process |
Also Published As
Publication number | Publication date |
---|---|
EP1190107A1 (en) | 2002-03-27 |
DE60001577T2 (en) | 2003-07-10 |
AU4529400A (en) | 2000-12-12 |
DE60001577D1 (en) | 2003-04-10 |
BR9901553A (en) | 2001-01-16 |
WO2000071765A1 (en) | 2000-11-30 |
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