EP2771493A2 - High performance aisimgcu casting alloy - Google Patents
High performance aisimgcu casting alloyInfo
- Publication number
- EP2771493A2 EP2771493A2 EP12787267.9A EP12787267A EP2771493A2 EP 2771493 A2 EP2771493 A2 EP 2771493A2 EP 12787267 A EP12787267 A EP 12787267A EP 2771493 A2 EP2771493 A2 EP 2771493A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- temperature
- casting
- aluminum
- casting alloy
- 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
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 299
- 239000000956 alloy Substances 0.000 title claims abstract description 299
- 238000005266 casting Methods 0.000 title claims abstract description 86
- 239000010949 copper Substances 0.000 claims abstract description 104
- 239000011777 magnesium Substances 0.000 claims abstract description 85
- 229910052802 copper Inorganic materials 0.000 claims abstract description 56
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 51
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 46
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 238000010791 quenching Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 47
- 239000000470 constituent Substances 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000011701 zinc Substances 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 229910052725 zinc Inorganic materials 0.000 claims description 17
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 229910052709 silver Inorganic materials 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- 229910052726 zirconium Inorganic materials 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 8
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910019064 Mg-Si Inorganic materials 0.000 claims description 7
- 229910019406 Mg—Si Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 239000011572 manganese Substances 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910016343 Al2Cu Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910019752 Mg2Si Inorganic materials 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052735 hafnium Inorganic materials 0.000 claims description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 24
- 230000032683 aging Effects 0.000 abstract description 20
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 68
- 238000013459 approach Methods 0.000 description 35
- 230000000694 effects Effects 0.000 description 21
- 238000012360 testing method Methods 0.000 description 18
- 238000007792 addition Methods 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- 239000002245 particle Substances 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 230000035882 stress Effects 0.000 description 11
- 229910019086 Mg-Cu Inorganic materials 0.000 description 8
- 238000000879 optical micrograph Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 238000001878 scanning electron micrograph Methods 0.000 description 7
- 229910017818 Cu—Mg Inorganic materials 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 6
- 229910000861 Mg alloy Inorganic materials 0.000 description 5
- 229910000967 As alloy Inorganic materials 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910018566 Al—Si—Mg Inorganic materials 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002059 quaternary alloy Inorganic materials 0.000 description 2
- 239000011856 silicon-based particle Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- -1 (2) Where Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- 241001137485 Oecetis iti Species 0.000 description 1
- 229910007981 Si-Mg Inorganic materials 0.000 description 1
- 229910008316 Si—Mg Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- C22F1/043—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 silicon as the next major constituent
-
- 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
-
- 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
Definitions
- the present invention relates to aluminum alloys, and more particularly, to aluminum alloys used for making cast products.
- Aluminum alloys are widely used, e.g., in the automotive and aerospace industries, due to a high performance-to-weight ratio, favorable corrosion resistance and other factors.
- Various aluminum alloys have been proposed in the past that have characteristic combinations of properties in terms of weight, strength, castability, resistance to corrosion, cost, etc. Improvements in alloys to exhibit an improved combination of properties, e.g., that render them more suitable for one or more applications, remain desirable.
- the disclosed subject matter relates to improved aluminum casting alloys (also known as foundry alloys) and methods for producing same. More specifically, the present application relates to an aluminum casting alloy having: 8.5 - 9.5 wt. % silicon, 0.5 - 2.0 wt. % copper (Cu), 0.27 - 0.53 wt. % magnesium (Mg), wherein the aluminum casting alloy includes copper and magnesium such that 4.7 ⁇ (Cu+lOMg) ⁇ 5.8, up to 5.0 wt. % zinc, up to 1.0 wt. % silver, up to 0.30 wt. % titanium, up to 1.0 wt. % nickel, up to 1.0 wt. % hafnium, up to 1.0 wt.
- manganese up to 1.0 wt. % iron, up to 0.30 wt. % zirconium, up to 0.30 wt. % vanadium, up to 0.10 wt. % of one or more of strontium, sodium, antimony and calcium and other elements being ⁇ 0.04 wt. % each and ⁇ 0.12 wt. % in total, the balance being aluminum.
- the aluminum casting alloy includes 1.35 - 2.0 wt. % copper and 0.27 - 0.445 wt. % magnesium. In one approach, the aluminum casting alloy includes 0.5 - 0.75 wt. % copper and 0.395 - 0.53 wt. % magnesium.
- the aluminum casting alloy includes 0.75 - 1.35 wt. % copper and 0.335 - 0.505 wt. % magnesium.
- the aluminum casting alloy includes copper and magnesium such that 5.0 ⁇ (Cu+10Mg) ⁇ 5.5.
- the aluminum casting alloy includes copper and magnesium such that 5.1 ⁇ (Cu+10Mg) ⁇ 5.4.
- the aluminum casting alloy contains ⁇ 0.25 wt. % zinc.
- the aluminum casting alloy contains 0.5 wt. to 5.0 wt. % zinc.
- the aluminum casting alloy contains ⁇ 0.01 wt. silver.
- the aluminum casting alloy contains 0.05 - 1.0 wt. % silver.
- the casting aluminum casting alloy contains 0.1 - 0.12 wt. % titanium.
- the casting aluminum casting alloy contains 0.12 - 0.14 wt. %
- the casting aluminum casting alloy contains 0.08 - 0.19 wt. %
- the casting aluminum casting alloy contains 0.14 - 0.3 wt. %
- the casting aluminum casting alloy contains 0.15 - 0.57 wt. % iron. In one approach, the casting aluminum casting alloy contains 0.1 - 0.12 wt. % vanadium. In one approach, the casting aluminum casting alloy contains 0.11 - 0.13 wt. %
- the casting aluminum casting alloy contains 0.27 - 0.3 wt. % nickel. In one approach, the casting aluminum casting alloy contains 0.15 - 0.33 wt. % iron. In one approach, the casting aluminum casting alloy contains 0.03 - 0.15 wt. % manganese.
- the casting aluminum casting alloy contains 0.05 - 0.2 wt. % hafnium. In one approach, the casting aluminum casting alloy contains 0.1 - 0.12 wt. % vanadium. In one approach, the casting aluminum casting alloy contains 0.012 - 0.04 wt. % zirconium.
- a method of selecting a solutionization temperature includes the steps of:
- the constituent phases are the phases formed during solidification.
- the identified steps A-D include:
- the dissolvable constituent phases are Q-AlCuMgSi, Mg 2 Si, Al 2 Cu, S- AlCuMg, etc. and the dissolvable constituent phase with the highest formation temperature is Q- AlCuMgSi phase in an Al Si Mg Cu alloy.
- the formation temperature of dissolvable constituent phases and solidus temperature are determined by computational thermodynamics.
- the formation temperature of dissolvable constituent phases and solidus temperature are calculated using PandatTM Software and PanAluminumTM Database.
- an alloy is heat treated by heating the alloy above the formation temperature of all dissolvable constituent phases, but below the calculated solidus temperature.
- the alloy is an Al Si Mg Cu alloy and the dissolvable constituent phase with the highest formation temperature is Q-AlCuMgSi phase.
- a method for preparation of an alloy includes the steps of:
- step (D) Heating the solidified alloy to a temperature in the range identified in step (B) and below the solidus temperature of the alloy.
- a first elemental component and a second elemental component in their relative wt. % amounts in the alloy contribute to properties of the alloy as well as contribute to determining the formation temperature of all dissolvable constituent phases in the alloy and further comprising the steps of ascertaining a range of target properties for the alloy as effected by the first and second elemental components; ascertaining a range of relative wt % amounts for the first and second elemental components that provides the range of target properties prior to step (B) of identifying a range of temperatures.
- the first elemental component is Cu and the second elemental component is Mg in an Al Si Mg Cu alloy.
- Figure 1 is a graph of phase equilibria involving (Al) and liquid in an Al-Cu-Mg-Si system.
- Figure 2 is a graph of the effect of Cu additions on the solidification path of Al-9%Si-
- Figure 3 is a graph of the effect of Cu content on phase fractions in Al-9%-0.4%Mg- 0.1%Fe-x%Cu alloys.
- Figure 4 is a graph of the effect of Cu and Mg content on the Q-phase formation temperature of Al-9%Si-Mg-Cu alloys.
- Figure 5 is a graph of the effect of Mg and Cu content on the equilibrium solidus temperature of Al-9%Si-Mg-Cu alloys.
- Figure 6 is a graph of the effect of Mg and Cu content on the equilibrium solidus temperature (Ts) and Q-phase formation temperature (TQ) of Al-9%Si-Mg-Cu alloys.
- Figure 7 is a graph of the effect of zinc and silicon on the fluidity of Al-x%Si-0.5%Mg- y%Zn alloys
- Figure 8 is an SEM (scanning electron micrograph) @200X magnification, showing spherical Si particles and un-dissolved Fe-containing particles.
- Figures 9a-b are photographs of undissolved Fe-containing particles in the investigated alloys.
- Figures lOa-d are graphs of the effect of aging condition on tensile properties of the Al- 9Si-0.5Mg alloy.
- Figures 1 la-d are graphs of the effect of Cu on tensile properties of the Al-9%Si-0.5%Mg alloy.
- Figures 12a-d are graphs of the effect of Cu and Zn on tensile properties of the Al-9%Si- 0.5%Mg alloy.
- Figures 13a-d are graphs of the effect of Mg content on tensile properties of the Al-9%Si- 1.25%Cu-Mg alloy.
- Figures 14a-d are graphs of the effect of Ag on tensile properties of the Al-9%Si- 0.35%Mg-1.75%Cu alloy.
- Figures 15a-d are graphs of tensile properties for six alloys aged for different times at an elevated temperature, as described in the disclosure.
- Figure 16 is a graph of Charpy impact energy (CIE) vs. yield strength for five alloys aged for different times at an elevated temperature.
- CIE Charpy impact energy
- Figure 19a-d - 23a-d are optical micrographs of cross-sections of samples of five alloys as cast and machined and aged for two different time periods at an elevated temperature after 6- hour ASTM G110.
- Figure 24 is a graph of depth of attack of selected alloys aged for different time periods on the as-cast and machined surfaces after a 6-hour Gl 10 test.
- Figure 25 is a graph of Mg and Cu content correlated to strength and ductility for Al-9Si- Mg-Cu alloys.
- Figure 26 is a graph of tensile properties of a specific alloy (alloy 9) after exposure to high temperatures.
- Figures 27a and 27b are scanning electron micrographs of a cross-section of a sample of alloy 9 prior to exposure to high temperatures.
- Figures 28a-e are a series of scanning electron micrographs of a cross-section of alloy 9 after exposure to increasing temperatures correlated to a tensile property graph of alloy 9 and A356 alloy.
- Figure 29 is a graph of yield strength at room temperature for various alloys.
- Figure 30 is a graph of yield strength after exposure to 175 °C for various alloys.
- Figure 31 is a graph of yield strength after exposure to 300 °C for various alloys.
- Figure 32 is a graph of yield strength after exposure to 300 °C for various alloys.
- Figure 33 is a graph of yield strength after exposure to 300 °C for various alloys.
- Figure 34 is a graph of yield strength after exposure to 300 °C for various alloys.
- Figure 1 shows the calculated phase diagram of the Al-Cu-Mg-Si quaternary system, as shown in X. Yan, Thermodynamic and solidification modeling coupled with experimental investigation of the multicomponent aluminum alloys. University of Wisconsin -Madison, 2001, which is incorporated in its entirety by reference herein.
- Figure 1 shows the three phase equilibria in ternary systems and the four phase equilibria quaternary monovariant lines.
- Points A, B, C, D, E and F are five phase invariant points in the quaternary system.
- Points Tl to T6 are the four-phase invariant points in ternary systems and Bl, B2 and B3 are the three phase invariant points in binary systems.
- Q-phase (AlCuMgSi) constituent particles during solidification is almost inevitable for an Al-Si-Mg alloy containing Cu since Q-phase is involved in the eutectic reaction (invariant reaction B). If these Cu-containing Q-phase particles cannot be dissolved during solution heat treatment, the strengthening effect of Cu will be reduced and the ductility of the casting will also suffer.
- thermodynamic computation was used to select alloy composition (mainly Cu and Mg content) and solution heat treatment for avoiding un-dissolved Q-phase particles.
- Figure 2 shows the predicted effect of 1% Cu (all compositions in this report are in weight percent) on the solidification path of Al-9%Si-0.4%Mg- 0.1 %Fe. More particularly, the solidification temperature range is significantly increased with the addition of 1% Cu due to the formation of Cu-containing phases at lower temperatures.
- Q-AlCuMgSi formed at ⁇ 538°C and 9-Al 2 Cu phase formed at ⁇ 510°C.
- the volume fraction of each constituent phase and their formation temperatures are also influenced by the Cu content.
- Figure 3 shows the predicted effect of Cu content on phase fractions in Al-9%Si- 0.4%Mg-0.1%Fe-x%Cu alloys.
- the amount of 9-Al 2 Cu and Q- AlCuMgSi increases while the amount of Mg 2 Si and ⁇ -AlFeMgSi decreases.
- Mg 2 Si phase will not form during solidification.
- the amount of Q- AlCuMgSi is also limited by the Mg content in the alloy if the Cu content is more than 0.7%.
- the Q-AlCuMgSi phase formation temperature (TQ) in Al-9%Si-Mg-Cu alloys is a function of Cu and Mg content.
- the "formation temperature" of a constituent phase is defined as the temperature at which the constituent phase starts to form from the liquid phase.
- Figure 4 shows the predicted effects of Cu and Mg content on the formation temperature of Q-AlCuMgSi phase.
- the formation temperature of Q-AlCuMgSi phase decreases with increasing Cu content; but increases with increasing Mg content.
- the solution heat treatment temperature (TH) needs to be controlled above the formation temperature of the Q-AlCuMgSi phase, i.e., TH > TQ.
- the upper limit of the solution heat treatment temperature is the equilibrium solidus temperature (Ts) in order to avoid re-melting.
- Ts equilibrium solidus temperature
- the solution heat treatment temperature is controlled to be at least 5 to 10°C below the solidus temperature to avoid localized melting and creation of metallurgical flaws known in the art as rosettes. Hence, in practice, the following relationship is established: Ts-10°C > T H > T Q (1)
- the alloy composition mainly the Cu and Mg contents, should be selected so that the formation temperature of Q- AlCuMgSi phase is lower than the solidus temperature.
- Figure 5 shows the predicted effects of Cu and Mg content on the solidus temperature of Al-9%Si-Cu-Mg alloys. As expected, the solidus temperature decreases as the Cu and Mg content increases.
- Mg content increases the formation temperature of the Q-AlCuMgSi phase but decreases the solidus temperature as indicated in Figure 6.
- the Q-AlCuMgSi phase formation temperature surface and the (Ts-10°C) surface (10°C below the solidus temperature surface) are superimposed in Figure 6.
- the upper boundary, Cu+10Mg 5.78, was defined by the intersection of the Q-AlCuMgSi phase formation temperature surface and the (Ts-5°C) surface (5°C below the solidus temperature surface).
- Q-AlCuMgSi phase particles can be completely dissolved during solution heat treatment when the Cu and Mg contents are controlled within these boundaries.
- the preferred Mg and Cu content to maximize the alloy strength and ductility is shown in Figure 25.
- Mg and Cu content are defined by:
- Cu+10Mg 5.25 with 0.5 ⁇ Cu ⁇ 2.0.
- the foregoing approach allows the selection of a solutionization temperature by (i) calculating the formation temperature of all dissolvable constituent phases in an aluminum alloy; (ii) calculating the equilibrium solidus temperature of an aluminum alloy; (iii) defining a region in Al-Cu-Mg-Si space where the formation temperature of all dissolvable constituent phases is at least 10°C below the solidus temperature.
- the Al-Cu-Mg-Si space is defined by the relative % composition of each of Al, Cu, Mg and Si and the associated solidus temperatures for the range of relative composition.
- the space may be defined by the solidus temperature associated with relative composition of two elements of interest, e.g., Cu and Mg, which are considered relative to their impact on the significant properties of the alloy, such as tensile properties.
- the solutionizing temperature may be selected to diminish the presence of specific phases, e.g., that have a negative impact on significant properties, such as, tensile properties.
- the alloy e.g., after casting, may be heat treated by heating above the calculated formation temperature of the phase that needs to be completely dissolved after solution heat treatment, e.g., the Q- AlCuMgSi phase, but below the calculated equilibrium solidus temperature.
- the formation temperature of the phase that needs to be completely dissolved after solution heat treatment and solidus temperatures may be determined by computational thermodynamics, e.g., using PandatTM software and
- the actual compositions are very close to the target compositions.
- the hydrogen content (single testing) of the castings is given in Table 5.
- alloy 3 was degassed with porous lance; all other alloys were degassed using a rotary degasser.
- the preferred solution heat treat temperature as a function of Cu and Mg
- the solution heat treatment temperature should be higher than the Q-AlCuMgSi phase formation temperature.
- Table 6 lists the calculated final eutectic temperature, Q-phase formation temperature and solidus temperature using the targeted composition of the ten alloys investigated.
- the final step solution heat treatment temperature TH was determined from following equation based on Mg and Cu content:
- T H (°C) 570 - 10.48*Cu-71.6*Mg-1.3319*Cu*Mg-0.72*Cu*Cu+72.95*Mg*Mg, (2)
- Mg and Cu are magnesium and copper contents, in wt%
- a lower limit for TH is defined by:
- T Q 533.6-20.98*Cu+88.037*Mg+33.43*Cu*Mg-0.7763*Cu*Cu-126.267*Mg*Mg (3)
- An upper limit for TH is defined by:
- T s 579.2-10.48*Cu-71.6*Mg-1.3319*Cu*Mg-0.72*Cu*Cu+72.95*Mg*Mg (4)
- FIG. 8 shows the microstructure of the Al-9%Si-0.35%Mg- 1.75%Cu alloy (alloy #9) in the T6 temper. Si particles were all well-spheroidized. Some undissolved particles were identified as ⁇ -AlFeSi, ⁇ -AlFeMgSi and Al 7 Cu 2 Fe phases. The morphologies of these un-dissolved phases are shown in Figure 9 at higher magnification.
- Tensile properties were evaluated according to the ASTM B557 method. Test bars were cut from the modified ASTM B108 castings and tested on the tensile machine without any further machining. All the tensile results are an average of five specimens. Toughness of selected alloys was evaluated using the un-notched Charpy Impact test, ASTM E23-07a. The specimen size was 10mm X 10mm X 55mm machined from the tensile-bar casting. Two specimens were measured for each alloy.
- Smooth S-N fatigue test was conducted according to the ASTM E606 method. Three stress levels, 100 MPa, 150 MPa, and 200 MPa were evaluated. The R ratio was -1 and the frequency was 30 Hz. Three replicated specimens were tested for each condition. Test was terminated after about 10 7 cycles. Smooth fatigue round specimens were obtained by slightly machining the gauge portion of the tensile bar casting.
- Corrosion resistance (type-of-attack) of selected conditions was evaluated according to the ASTM Gl lO method. Corrosion mode and depth-of-attack on both the as-cast surface and machined surface were assessed.
- the effect of artificial aging temperature on tensile properties was investigated using the baseline alloy l-Al-9%Si-0.5%Mg. After a minimum 4 hours of natural aging, the tensile bar castings were aged at 155°C for 15, 30, 60 hours and at 170°C for 8, 16, 24 hours. Three replicate specimens were used for each aging condition.
- Figure 10 shows the tensile properties of the baseline A359 alloy (Al-9%Si-0.5%Mg) at various aging conditions.
- Low aging temperature (155°C) tends to yield higher quality index than the high aging temperature (170°C).
- the low aging temperature at 155°C was selected, even though the aging time is longer to obtain improved properties.
- Figure 11 compares the tensile properties of baseline Al-9%Si-0.5%Mg alloy and Al- 9%Si-0.5%Mg-0.75%Cu alloy.
- the addition of 0.75%Cu to Al-9%Si-0.5%Mg alloy increases the yield strength by -20 MPa and ultimate tensile strength by -40 MPa while maintaining the elongation.
- the average quality index of the Cu-containing alloy is -560 MPa, which is much higher than the baseline alloy with an average of -520 MPa.
- Figure 12 compares the tensile properties of four cast alloys, 1, 2, 3 and 4.
- Alloy 1 is the baseline alloy.
- Alloy 2-4 all contain 0.75%Cu with various amounts of Mg and/or Zn.
- Alloys 3 and 4 contain 0.45%Mg, while alloy 2 contains 0.35%Mg and alloy 1 contains 0.5%Mg.
- Alloys 2 and 3 also have 4%Zn.
- a preliminary assessment of these four alloys indicates that Mg and Zn increase alloy strength without sacrificing ductility.
- a direct comparison between alloys 3 and 4 indicates that by adding 4%Zn to the Al-9%Si-0.45%Mg-0.75%Cu alloy, both ultimate tensile strength and yield strength are increased while maintaining the elongation.
- Figure 14 shows the effect of Ag (0.5wt%) on the tensile properties of Al-9%Si- 0.35%Mg-1.75%Cu alloy.
- An addition of 0.5wt% Ag had very limited impact on strength, elongation and quality index of the Al-9%Si-0.35%Mg-1.75%Cu alloy.
- the quality index of the Al-9%Si-0.35%Mg-1.75%Cu (without Ag) alloy is ⁇ 60MPa higher than the baseline alloy, A359 (Alloy 1)
- Figures 15a-15d show the tensile properties of five promising alloys in accordance with the present disclosure along with the baseline alloy Al-9Si-0.5Mg (alloy 1). These five alloys achieve the target tensile properties, i.e., 10-15% increase in tensile and maintaining similar elongation as A356/A357 alloy.
- the alloys are: Al-9%Si-0.45%Mg-0.75%Cu (Alloy 4), Al- 9%Si-0.45%Mg-0.75%Cu-4%Zn(Alloy 3), Al-9%Si-0.45%Mg-1.25%Cu (Alloy 7), Al-9%Si- 0.35%Mg-1.75%Cu (Alloy 9), and Al-9%Si-0.35%Mg-1.75%Cu-0.5%Ag (Alloy 10).
- Figure 16 shows the results of the individual tests by plotting Charpy impact energy vs. tensile yield strength.
- the filled symbols are for specimens aged at 155°C for 15 hours and open symbols are for specimens aged at 155°C for 60 hours.
- Tensile yield strength increases as the aging time increases, while the Charpy impact energy decreases with increasing aging time.
- the results indicate that most alloys/aging conditions follow the expected strength/toughness relationship. However, the results indeed show a slight degradation of the strength/toughness relationship with higher Cu content such as 1.25 and 1.75wt%.
- Aluminum castings are often used in engineered components subject to cycles of applied stress. Over their commercial lifetime millions of stress cycles can occur, so it is important to characterize their fatigue life. This is especially true for safety critical applications, such as automotive suspension components.
- Increasing aging time tended to decrease the number of cycles to failure. For example, as the aging time increased from 15 hours to 60 hours, the average number of cycles to failure at 150 MPa stress level decreased from -323,000 to -205,000 for the Al- 9%Si-0.45%Mg-0.75%Cu alloy and from -155,900 to -82,500 for the A359 alloy.
- the result could be a general trend of the strength/fatigue relationship of Al-Si-Mg-(Cu) casting alloys. Again, alloy 3 showed a lower fatigue performance than others.
- Figures 19 to 23 show optical micrographs of the cross-sectional views after 6-hour
- Figs. 19a-d show optical micrographs of cross-sections of Al-
- Figs. 20a-d show optical micrographs of cross-sections of Al-9%Si-0.35%Mg- 0.75%Cu-4%Zn after a 6-hour ASTM G110 test: a) of the alloy as cast and aged 15 hours at 155°C; b) of the alloy as cast and aged 60 hours at 155°C; c) of the alloy with a machined surface and aged 15 hours at 155°C; and d) of the alloy with a machined surface and aged 60 hours at 155°C.
- Figs. 21a-d show optical micrographs of cross-sections of Al-9%Si-0.45%Mg- 0.75%Cu after a 6-hour ASTM Gl 10 test: a) of the alloy as cast and aged 15 hours at 155°C; b) of the alloy as cast and aged 60 hours at 155°C; c) of the alloy with a machined surface and aged 15 hours at 155°C; and d) of the alloy with a machined surface and aged 60 hours at 155°C.
- Figs. 22a-d show optical micrographs of cross-sections of Al-9%Si-0.45%Mg- 1.25%Cu after a 6-hour ASTM Gl 10 test: a) of the alloy as cast and aged 15 hours at 155°C; b) of the alloy as cast and aged 60 hours at 155°C; c) of the alloy with a machined surface and aged 15 hours at 155°C; and d) of the alloy with a machined surface and aged 60 hours at 155°C.
- Figs. 23a-d show optical micrographs of cross-sections of Al-9%Si-0.35%Mg- 1.75%Cu after a 6-hour ASTM Gl 10 test: a) of the alloy as cast and aged 15 hours at 155°C; b) of the alloy as cast and aged 60 hours at 155°C; c) of the alloy with a machined surface and aged 15 hours at 155°C; and d) of the alloy with a machined surface and aged 60 hours at 155°C.
- Figure 24 shows the depth of attack after the 6-hour ASTM Gl 10 test. There is no clear difference or trend among the alloys. Aging time did not show obvious impact on the depth of attack either, while some differences were found between the as-cast surfaces and the machined surfaces. In general, the corrosion attack was slightly deeper on the machined surface than the as-cast surface of the same sample.
- the present disclosure has described Al-Si-Cu-Mg alloys that can achieve high strength without sacrificing ductility.
- Tensile properties including 450-470MPa ultimate tensile strength, 360-390MPa yield strength, 5-7 % elongation, and 560-590MPa Quality Index were obtained. These properties exceed conventional 3xx alloys and are very similar to that of the A201 (2xx+Ag) Alloy, while the castabilities of the new Al-9Si-MgCu alloys are much better than that of the A201 alloy.
- the new alloys showed better S-N fatigue resistance than A359 (Al-9Si-0.5Mg) alloys. Alloys in accordance with the present disclosure have adequate fracture toughness and general corrosion resistance.
- Figure 26 shows a graph of tensile properties of an alloy in accordance with the present disclosure, namely, Al-9Si-0.35Mg-l .75Cu (previously referred to as alloy 9, e.g., in Figure 15) after exposure to various temperatures.
- the exposure time of the alloys was 500 hours at the indicated temperature.
- the samples were also tested at the temperature indicated.
- the yield strength of the alloy diminished significantly at temperatures above 150°C.
- the metal was analyzed to ascertain features associated with the loss in strength due to exposure to increased temperatures.
- Figures 27a and 27b show scanning electron microscope (SEM) micrographs of a cross- section of a sample of alloy 9 prior to exposure to high temperatures, with 27b being an enlarged view of the portion of the micrograph of 31 a indicated as "Al". As shown in Figure 27a, the grain boundaries are visible, as well as, Si and AlFeSi particles. The predominately Al portion shown in Figure 27b shows no visible precipitate at 20,000X magnification.
- SEM scanning electron microscope
- Figures 28a-e show a series of scanning electron microscope (SEM) micrographs of a cross-section of alloy COO (previously referred to as alloy 9, e.g., in Figure 15) of the same scale as the micrograph shown in Figure 27b after exposure to increasing temperatures as shown by the correlation of the micrographs to the data points on the tensile property graph G of alloy 9.
- the tensile characteristics of A356 alloy in the given temperature range are also shown in graph G for comparison.
- exposure of alloy 9 to increasing temperatures results in continuously increasing prominence of precipitate particles, which are larger, and which exhibit divergent geometries.
- alloying elements viz., Ti, V, Zr, Mn, Ni, Hf, and Fe could be introduced to the COO alloy ( previously referred to as alloy 9, e.g., in Figure 15) of the present disclosure in small amounts to produce an alloy that resists strength degradation at elevated temperatures.
- Table 10 show 18 alloys utilizing additive elements in small quantities to the COO alloy (previously referred to as alloy 9, e.g., in Figure 15) for the purpose of developing improved strength at elevated temperatures.
- Table 11 shows the mechanical properties of the foregoing alloys, viz., ultimate tensile strength (UTS), total yield strength (TYS) and Elongation % at 300 °C, 175° C and room temperature (RT). Table 11. Mechanical Properties at Various Temperatures
- Figure 29 shows a graph of yield strength at room temperature for foregoing alloys.
- A356 is shown for comparison.
- DOE department of energy
- the COO alloy is comparable in strength at room temperature to alloys C02-C18, all of which substantially exceed the strength of the A356 alloy and the DOE target properties.
- Alloy C01 - without substantial quantities of Mg has a far lower yield strength.
- Figure 30 is a graph of yield strength after exposure to 175 °C for 500 hours for the foregoing alloys.
- the COO, as well as A356 are shown for comparison.
- the COO alloy substantially exceeds the strength of the A356 alloy.
- Alloys C02-C18 all show marked improvement over both A356 and COO.
- Figure 31 is a graph of yield strength after exposure to 300°C for 500 hours for the foregoing alloys. COO, as well as A356 are shown for comparison.
- Figure 32 shows is a graph of yield strength after exposure to 300°C for various alloys. More particularly, adjacent alloys (going in the direction of the arrows) show the result of an additional element or the increase in quantity of an element. The highest result in the graph of Figure 32 is for COO + 0.1T +0.16Fe+ 0.13V + 0.1 Zr. The addition of more Zr (to 0.18%) to this combination results in decreased performance.
- Figure 33 is a graph of yield strength after exposure to 300 °C for various alloys for 500 hours.
- the graphs show improvements due to the addition of Ti, Fe and Mn to the COO composition, with the maximum performance noted relative to COO + 0.1 ITi + 0.32Fe + 0.3Mn.
- the addition of V to the foregoing reduces performance and the further addition of 0.12 Zr brings performance almost back to the maximum level.
- Figure 34 is a graph of yield strength after exposure to 300 °C for various alloys, i.e., due to the addition of elements to the COO composition. The optimal performance is noted relative to COO + O.ITi + 0.28 ⁇ + 0.32 Fe + 0.14Mn + 0.1 Hf + 0.1 IV + 0.04Zr. It will be understood that the embodiments described herein are merely exemplary and that a person skilled in the art may make many variations and modifications without departing from the spirit and scope of the claimed subject matter. For example, use different aging conditions may produce different resultant characteristics. All such variations and modifications are intended to be included within the scope of the appended claims.
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EP3342888A1 (en) | 2016-12-28 | 2018-07-04 | Befesa Aluminio, S.L. | Aluminium casting alloy |
EP3342890A1 (en) | 2016-12-28 | 2018-07-04 | Befesa Aluminio, S.L. | Aluminium casting alloy |
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ES2582529T3 (en) * | 2013-10-23 | 2016-09-13 | Befesa Aluminio, S.L. | Cast aluminum alloy |
EP2865772B1 (en) * | 2013-10-23 | 2016-04-13 | Befesa Aluminio, S.L. | Aluminium casting alloy |
CN103740987B (en) * | 2014-01-27 | 2016-07-06 | 烟台三和新能源科技有限公司 | High-strength aluminum alloy and production technology thereof |
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CN115233049B (en) * | 2022-07-29 | 2023-07-21 | 湖南江滨机器(集团)有限责任公司 | Heat treatment-free aluminum alloy and preparation method thereof |
CN118006983A (en) * | 2022-11-09 | 2024-05-10 | 北京车和家汽车科技有限公司 | Aluminum alloy material and preparation method and application thereof |
CN115679162A (en) * | 2022-11-18 | 2023-02-03 | 江西万泰铝业有限公司 | New energy automobile heat treatment-free aluminum alloy material and low-carbon preparation method |
CN116288085B (en) * | 2023-02-08 | 2024-01-05 | 常州工学院 | Heat treatment method for improving high-temperature strength of Al-Cu-Mn-Zr aluminum alloy |
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JPWO2008016169A1 (en) * | 2006-08-01 | 2009-12-24 | 昭和電工株式会社 | Aluminum alloy molded product manufacturing method, aluminum alloy molded product and production system |
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