EP4048823A1 - Alliage d'aluminium présentant une aptitude à l'extrusion et une résistance à la corrosion améliorées - Google Patents

Alliage d'aluminium présentant une aptitude à l'extrusion et une résistance à la corrosion améliorées

Info

Publication number
EP4048823A1
EP4048823A1 EP20880265.2A EP20880265A EP4048823A1 EP 4048823 A1 EP4048823 A1 EP 4048823A1 EP 20880265 A EP20880265 A EP 20880265A EP 4048823 A1 EP4048823 A1 EP 4048823A1
Authority
EP
European Patent Office
Prior art keywords
extruded
aluminum alloy
brazed
product
alloy comprises
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.)
Pending
Application number
EP20880265.2A
Other languages
German (de)
English (en)
Other versions
EP4048823A4 (fr
Inventor
Nicholas Charles Parson
Raynald GUAY
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.)
Rio Tinto Alcan International Ltd
Original Assignee
Rio Tinto Alcan International 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 Rio Tinto Alcan International Ltd filed Critical Rio Tinto Alcan International Ltd
Publication of EP4048823A1 publication Critical patent/EP4048823A1/fr
Publication of EP4048823A4 publication Critical patent/EP4048823A4/fr
Pending legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • 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

Definitions

  • the present disclosure relates to aluminum alloy-based extruded and brazed products and methods for producing same.
  • Aluminum alloys provide corrosion resistance to manufactured parts, and are used for example in the automotive industry as well as in heat exchangers and air conditioning applications. They are used in tubing because of their good extrudability while being light weight and offering moderate strength. Long-life corrosion resistant alloys have typically used high Mn contents or additions of Ti, which are detrimental to extrudability and can reduce extrusion speeds and die life. It is a challenge to improve extrudability without hindering the long-life corrosion performance of the alloys. Improvements are desired.
  • the present disclosure concern aluminum alloy having increasing extrudability characteristics as well as aluminum products comprising same having increased corrosion resistance.
  • the present disclosure provides an extruded and brazed product comprising an aluminum alloy comprising in weight percent Mn 0.6 - 0.75; Fe 0.11 - 0.16; Si 0.10 - 0.19; Cu ⁇ 0.01 ; Zn ⁇ 0.05; Ti ⁇ 0.05 with the balance being aluminum and inevitable impurities.
  • less than 15% of the product’s width includes coarse recrystallized grains.
  • each of the inevitable impurities is present at a maximum of 0.03 and the total inevitable impurities comprises less than 0.10.
  • the aluminum alloy comprises less than 0.01 Ni.
  • the aluminum alloy comprises less than 0.05 Mg.
  • the aluminum alloy comprises less than 0.05 Cr. In yet another embodiment, the aluminum alloy comprises between 0.64 to 0.72 Mn. In still a further embodiment, the aluminum alloy comprises between 0.11 to 0.14 Si. In some embodiments, the aluminum alloy comprises between 0.12 to 0.16 Fe. In additional embodiments, the aluminum alloy comprises between 0.011 to 0.024 Ti. In some embodiments, the extruded and brazed product is an extruded and brazed tubing, such as, for example, a micro-multiport tubing.
  • the present disclosure provides a method for producing an extruded and brazed product.
  • a billet is provided, the billet comprising an aluminum alloy comprising in weight percent Mn 0.6 - 0.75; Fe 0.11 - 0.16; Si 0.10 - 0.19; Cu ⁇ 0.01 ; Zn ⁇ 0.05; Ti ⁇ 0.05 with the balance being aluminum and inevitable impurities.
  • the billet is homogenized with at least one heat treatment.
  • the billets are then extruded into the product and the product is brazed to obtain the extruded and brazed product.
  • the method can further comprise, before providing the billets, casting the aluminum alloy into the billets.
  • the method further comprises, after homogenizing and before extruding, cooling the billets.
  • each of the inevitable impurities of the aluminum alloy is present at a maximum of 0.03 and the total inevitable impurities comprises less than 0.10.
  • the aluminum alloy comprises less than 0.01 Ni.
  • the aluminum alloy comprises less than 0.05 Mg.
  • the aluminum alloy comprises less than 0.05 Cr.
  • the aluminum alloy comprises between 0.64 to 0.72 Mn.
  • the aluminum alloy comprises between 0.10 to 0.14 Si.
  • the aluminum alloy comprises between 0.12 to 0.16 Fe.
  • the aluminum alloy comprises between 0.011 to 0.024 Ti.
  • the extruded and brazed product is a tubing, such as, for example, a micro-multiport tubing.
  • the present disclosure provides an extruded and brazed product obtainable or obtained by the method described herein.
  • FIG. 1 is a graph of dispersoid volume fraction of three aluminum alloy compositions (content in Fe and Si is provided in the figure legend) as a function of soak time (hours).
  • FIG. 2 is an example of standard alloy AA3012A exhibiting coarse recrystallized grains through the outer wall thickness.
  • FIG. 3 shows the surface of sample in Figure 2 after macroetching showing coarse recrystallized grains on surface.
  • FIG. 4A shows the surface grain structure revealed by Poulton’s macrotech of different tubes obtained from a commercial operation.
  • the material on the left is the “as extruded” tube, the material in the middle has been submitted to a simulated braze thermal cycle of 2 min. at 605°C whereas the material on the right has been submitted to a simulated braze thermal cycle of 4 min. at 605°.
  • FIG. 4B shows the surface grain structure revealed by Poulton’s macrotech of brazed tubes obtained from a commercial operation. The material has been submitted to a simulated braze thermal cycle of 4 min. at 625°.
  • the present disclosure concerns Al-Mn-Si-Fe extrusion alloys having improved extrudability as well as products comprising same exhibiting long-life corrosion resistance.
  • the aluminum alloys of the present disclosure exhibit improved extrudability.
  • the extruded and brazed products made from the alloys of the present disclosure exhibit a fine post-brazed grain structure and/or tolerance to extended homogenization and brazing cycles.
  • a “fine post-brazed grain structure” refers to a structure consisting mainly of residual fine grains produced during the extrusion process and the corresponding absence of coarse recrystallized grains formed during the braze cycle.
  • fine as-extruded grain structure refers to the a structure consisting mainly of residual fine grains produced during the extrusion process and before any brazing cycle.
  • coarse recrystallized grains refers to grains with a width across the extruded surface (i.e. perpendicular to the extrusion direction) higher than 200 microns or grains with a thickness extending through the entire outer wall thickness of the tube.
  • Figure 2 shows an example of the grain structure of alloy AA3012A after sizing and brazing where coarse recrystallized grains are present extending through the wall thickness.
  • Figure 3 shows the appearance of the tube surface of the same sample as in Figure 2 after macroetching, revealing coarse recrystallized grains on the tube surface with a width higher than 200 microns.
  • extruded (e.g., aluminum) products are especially useful in making extruded (e.g., aluminum) products.
  • Extruded aluminum products refers to products made from the aluminum alloy of the present disclosure which have been pushed through a die at elevated temperature to obtain a desired cross section.
  • the extruded aluminum products of the present disclosure are brazed to other components, for example to create a heat exchanger.
  • “Brazing” as defined herein is the process of metal- joining two or more items by melting and flowing a filler metal into at least one joint.
  • a “brazed product” is defined as having been subjected to brazing.
  • the chemistry of the aluminum alloys of the present disclosure favors retention of a fine post-brazed grain structure in the outer wall of the product (e.g., tube) and thus prevents or limits recrystallization or “coarse grain formation” during high temperature brazing. Recrystallization at this stage replaces the desirable fine grain structures resulting from extrusion and replaces it with a coarse grain structure where one coarse grain can occupy the entire tube wall thickness. This condition offers a direct corrosion path through the material and is detrimental to the corrosion resistance of the tubing. Thus, recrystallization into coarser grains has to be avoided, prevented or limited.
  • an aluminum alloy comprising in weight percent Mn about 0.6 to about 0.75; Fe about 0.11 to about 0.16; Si about 0.10 to about 0.19; Cu less than about 0.01 ; Zn less than about 0.05; Ti less than about 0.05; optionally a grain refiner; optionally Ni less than about 0.01 ; and the balance being aluminum and inevitable impurities.
  • the aluminum alloy of the present disclosure is an Al-Mn-Si-Fe alloy and thus includes Mn.
  • the Mn content of the aluminum alloy of the present disclosure is lower than standard corresponding “long-life” Al-Mn-Si-Fe alloys. This reduction in Mn content provides reduced flow stress and improved extrudability. Mn is also important for the formation of Al- Mn-Fe-Si dispersoids and for providing increased self-corrosion protection along with adequate mechanical strength.
  • Mn can be present in the aluminum alloy of the present disclosure in weight percent from about 0.6 to about 0.75, from about 0.61 to about 0.74, from about 0.62 to about 0.73, from about 0.63 to about 0.72, from about 0.64 to about 0.71 , from about 0.65 to about 0.70, from about 0.66 to about 0.69, from about 0.67 to about 0.68, from about 0.6 to about 0.74, from about 0.6 to about 0.73, from about 0.6 to about 0.72, from about 0.6 to about 0.71 , from about 0.6 to about 0.70, from about 0.6 to about 0.69, from about 0.6 to about 0.68, from about 0.6 to about 0.67, from about 0.6 to about 0.66, from about 0.6 to about 0.65, from about 0.6 to about 0.64, from about 0.6 to about 0.63, from about 0.6 to about 0.62, from about 0.6 to about 0.61 , from about 0.61 to about 0.75, from about 0.62 to about 0.75, from about 0.63 to about 0.75, from about 0.64 to about 0.75, from
  • the aluminum alloys of the present disclosure also include Fe which is beneficial for increasing the resistance to coarse recrystallized grain formation after homogenization. Fe also plays a role in controlling the distribution of Al-Mn-Fe-Si dispersoids. Furthermore, Fe reduces the solubility of Mn and facilitates the formation of Al-Mn-Fe-Si dispersoids. However, excessive levels of Fe can be detrimental to pitting corrosion resistance by providing active cathode sites.
  • Fe can be present in the aluminum alloy of the present disclosure in weight percent from about 0.11 to about 0.16, from about 0.12 to about 0.15, from about 0.13 to about 0.14, from about 0.12 to about 0.16, from about 0.13 to about 0.16, from about 0.14 to about 0.16, from about 0.15 to about 0.16, from about 0.11 to about 0.15, from about 0.11 to about 0.14, from about 0.11 to about 0.13 or from about 0.11 to about 0.12.
  • the Si present in the aluminum alloys of the present disclosure promotes Al-Mn-Fe-Si dispersoid formation and contributes to the distribution of the Al-Mn-Fe-Si dispersoids.
  • Si reduces the tendency for reduction in the volume fraction of dispersoids with extended homogenization times.
  • excessive Si levels can lower the bulk melting point of the alloy and reduce extrudability.
  • Si can be present in the aluminum alloys of the present disclosure in weight percent from about 0.10 to about 0.19, from about 0.11 to about 0.19, from about 0.12 to about 0.19, from about 0.13 to about 0.19, from about 0.14 to about 0.19, from about 0.15 to about 0.19, from about 0.16 to about 0.19, from about 0.17 to about 0.19, from about 0.18 to about 0.19, from about 0.10 to about 0.18, from about 0.11 to about 0.18, from about 0.12 to about 0.18, from about 0.13 to about 0.18, from about 0.14 to about 0.18, from about 0.15 to about 0.18, from about 0.16 to about 0.18, from about 0.17 to about 0.18, from about 0.10 to about 0.17, from about 0.11 to about 0.17, from about 0.12 to about 0.17, from about 0.13 to about 0.17, from about 0.14 to about 0.17, from about 0.15 to about 0.17, from about 0.16 to about 0.17, from about 0.11 to about 0.17, from about 0.12 to about 0.17, from about 0.13
  • the aluminum alloys of the present disclosure can include, in some embodiments, Zn.
  • Extruded tubes for heat transfer applications are frequently coated with a galvanically sacrificial layer of Zn.
  • the Zn may be deposited by arc spray, use of a Zn containing flux or by plasma spray and the Zn diffuses into the tube surface during heating to the braze temperature.
  • the Zn concentration in the base alloy is limited to less than 0.05 wt. % as it can interfere with the behaviour of the sacrificial coating if present in a higher concentration.
  • a grain refiner may be optionally included in the aluminum alloys of the present disclosure to solidify aluminum alloys with a fully equiaxed, fine grain structure, in the form of Ti, TiB or TiC.
  • TiB is used as a grain refiner, this may result in a B content of up to 0.01 wt. % in the alloy.
  • the aluminum alloys of the present disclosure can include, in some embodiments, Ti.
  • Ti a high content of Ti can be detrimental to extrudability and can reduce extrusion speeds and die life, therefore the concentration of Ti, if present, is limited to less than 0.05 wt. %. For example in weight percent less than about 0.030, less than about 0.027 or less than about 0.024.
  • the aluminum alloys of the present disclosure can include, in some embodiments, Ni. However, since Ni can reduceself-corrosion resistance, the content of Ni is less than 0.01.
  • Mg is optionally present but is kept relatively low for extrudability and brazeability of the alloy, less than 0.05 wt%.
  • the balance of the alloy includes aluminum and inevitable impurities.
  • each of the inevitable impurity is present at a maximum of 0.05 (and in some embodiments 0.03) and the total inevitable impurities comprises less than 0.10.
  • the extruded and brazed product of the present disclosure include Al-Mn-Fe-Si dispersoids.
  • the Al-Mn-Fe-Si dispersoids are submicron particles that play a role in the deformation behaviour, recrystallization behaviour and resulting mechanical properties of products comprising the aluminum alloys of the present disclosure.
  • the dispersoids allow the fine as-extruded grain structure to be retained in the outer wall of a tube, after typical cold sizing and brazing treatments, for example combining the tubing with fins and header tubes to make a brazed heat exchanger.
  • the retention of the fine as-extruded grain structure in the outer wall of the shape, after brazing contributes to the corrosion resistance by presenting a more tortuous corrosion path through walls of the shape.
  • the extruded and brazed products include less than 15% coarse recrystallized grains across the tube width, preferably less than 12%, most preferably less than 10% when subjected to severe brazing and/or less than 5% recrystallization, preferably less than 3%, most preferably less than 1% when subjected to standard brazing (such as, for example, standard controlled atmosphere (CAB) brazing).
  • standard brazing such as, for example, standard controlled atmosphere (CAB) brazing.
  • CAB standard controlled atmosphere
  • less than 15%, 14%, 13%, 12%, 11% or 10% of the extruded and brazed product width is occupied by coarse recrystallized grains when subjected to severe brazing and/or less than 5%, 4%, 3%, 2% or 1% recrystallization when subjected to standard controlled atmosphere (CAB) brazing which is widely used for the production of aluminum heat exchangers.
  • CAB standard controlled atmosphere
  • the extruded and brazed products can be provided in any shape or form.
  • the extruded and brazed products can be in the form of a tube or a plurality of tubes.
  • the extruded and brazed products can be or comprise micro-multiport tubing (MMP).
  • MMP micro-multiport tubing
  • the extruded and brazed products are tubing or tubes (such as MMP), they can have a wall thickness of equal to or less than about 0.4 mm, 0.3 mm or 0.2 mm.
  • the present disclosure also provides a method for producing extruded and brazed products.
  • the method comprises working the aluminum alloy of the present disclosure into the aluminum product.
  • the working step can include casting the aluminum alloy directly into an intermediary billet intended for extrusion.
  • methods of the present disclosure first provides billets comprising an aluminum alloy as described herein. Then, the billets are homogenized with at least one heat treatment, the heat treatment comprising a treatment temperature in the range of 540°C to 590°C and for at least one soak time ranging from 1 to 8 hours to obtain an homogenized aluminum alloy billet. Next, the billets are extruded into products such as tubing. The product (tubing) is then optionally coiled, uncoiled, cold sized, assembled and then brazed to obtain the brazed product (tubes forming part of a heat exchanger). The brazing step can comprise at least one brazing cycle.
  • the aluminum alloy of the present disclosure is cast into the billets.
  • the homogenized aluminum products are cooled down, preferably at a cooling rate of 300°C/h or less.
  • alloys A to E were direct chill (DC) cast as 101 mm billets. Alloy A represents the existing state of the art, and is the benchmark of comparison.
  • concentration of Mn in the experimental alloys was increased compared to alloy A, alloys B and C had 0.64 wt. % Mn, and alloys D and E had 0.70 wt. % Mn.
  • concentration of Fe was increased compared to alloy A only in alloys C and E, to 0.14 and 0.15 wt. % respectively.
  • Table 1 The compositions of alloys A to E in weight percent, the balance being Al and inevitable impurities
  • the billets B to E were homogenized using four treatments, the first treatment (TR1) was 2 h at 550°C, the second treatment (TR2) was 6 h at 550°C, the third treatment (TR3) was 2 h at 560°C, and the fourth treatment (TR4) was 6 h at 560°C.
  • Billet A was only homogenized with TR1 and TR2.
  • the billets were then cooled at 300°C/h.
  • the cooled material was then extruded into mini microport (MMP) tubing with an outer wall thickness of 0.35 mm using a billet temperature of 480°C and an exit speed of 77 m/min. Lengths of the tubing were cold sized by rolling to give a thickness reduction of 4 % to replicate commercial tube sizing.
  • MMP mini microport
  • alloys A, F, G and H (chemistry detailed in Table 3) were DC cast as 101 mm diameter billets. Alloy A represents the existing state of the art, and is the benchmark of comparison. Alloys F, G, H had increasing concentrations of Si 0.08, 0.14, and 0.19 wt. % respectively. Table 3: The compositions of alloys A, F, G and H in weight percent the balance being Al and inevitable impurities
  • the alloys were homogenized for 6 h at 580°C to represent a high temperature long-soak cycle.
  • the billets were then cooled at 300°C/h.
  • the cooled material was then extruded into mini microport (MMP) tubing with an outer wall thickness of 0.35 mm using a billet temperature of 480°C and an exit speed of 77 m/min. Lengths of the tubing were cold rolled to give thickness reductions of 4% to replicate commercial tube sizing, and 10% to investigate excessive sizing.
  • an extreme braze cycle of 2.5 min at 625°C was applied.
  • the grain structures were assessed by macro-etching the flat surface of the tube and measuring the proportion of the tube width occupied by coarse recrystallized grains. The results are shown in Table 4.
  • Table 4 Results (in percentage) of proportion of tube width occupied by coarse recrystallized for alloys A, F, G and H.
  • alloy F which has a similar composition to alloy A but with an increased Fe content, fully recrystallized to a coarse grain structure.
  • increasing the Si from 0.08 to 0.14 wt. %, in alloy G provided remarkable control of the post-brazed grain size, and the trend continued with alloy H with 0.19 wt. % Si. Therefore, slight increases in Si content can provide post-brazed grain structure control under severe processing conditions.
  • Increasing the Si content from 0.08 to 0.19 reduces the melting point by 4°C, which could have some impact on extrudability. Therefore, further increases in Si beyond 0.19 wt. % are undesirable.
  • the mechanism of controlling the post-brazed structure and preventing coarse recrystallized grain recrystallization seems to be due, at least in part, to grain boundary pinning by submicron alpha - Al-Mn-Fe-Si dispersoid particles, which are presumed to form during homogenization.
  • the pinning effect is proportional to the volume fraction/particle radius.
  • the effects of composition and homogenization cycle observed in these experiments were probably due to changes in these two parameters.
  • Using a proprietary homogenization model developed to predict dispersoid growth and solute diffusion across a dendrite arm it is possible to predict the effects of composition on the dispersoid distribution.
  • Figure 1 shows how the volume fraction of dispersoids varies with Fe and Si contents for a 0.70 wt.% Mn base alloy during homogenization at 550°C.
  • a base level of 0.08 wt. % Si increasing Fe from 0.10 to 0.15 wt. % increased the volume fraction, but this starts to reduce after 2-3 hours soak, meaning that extended homogenization times can reduce the ability to prevent coarse recrystallized grain formation.
  • the Si content is increased from 0.08 to 0.13 wt. %, the initial dispersoid volume fraction is lower but continues to increase with longer homogenization times. This can offset the effect of extended soaking, which can occur under production conditions.
  • Alloys A, B, C, D, E, F, G and H were homogenised as described above and extruded into a 30 x 1.4 mm strip using a billet temperature of 480°C and an exit speed of 75 m/min.
  • Commercial alloy variants corresponding to AA3102 and an established commercial long life alloy were also processed for comparison. The material was water quenched at the die exit.
  • a simulated braze cycle of 5 mins at 605°C was applied to 100 mm coupons. These were degreased in alcohol and then 4 coupons per alloy exposed in the SWAAT corrosion test (ASTM G85) for 20 days. The mean pit depth was measured for each sample based on the 6 deepest pits per coupon selected by eye.
  • the extrudability, or potential extrusion speed of Al-Mn type alloys is controlled by the alloy flow stress at elevated temperature. A lower flow stress is an indicator of potentially higher extrusion speed and reduced die wear. Billets of alloys C and E were homogenized to a cycle of 2 hrs/550°C followed by cooling at 250°C/hr and alloys F, G and H were homogenised to a cycle of 2 hrs/580°C followed by cooling at 250°C/hr. A sample of the established commercial long life alloy was also processed to a standard commercial practice. Cylindrical samples 10 mm dia. x 10 mm in length were machined. Triplicate samples were tested in hot compression using a Gleeble 3800 machine.
  • the samples were heated at 100°C/min to 450°C and held for 5 mins before deforming in compression at a strain rate of 1/sec to a strain of 0.8.
  • the recorded load was converted to true stress and the value at a strain of 0.7 was extracted as a measure of the flow stress.
  • the mean flow stress of alloys C, E, G and H was 7-10% lower than the existing established commercial long life alloy, corresponding to a significant improvement in extrusion performance in all cases.
  • the alloy composition whose chemistry is detailed Table 7 was direct chill (DC) cast as 203 mm diameter billets. The billets were then homogenized (4hrs/550°C) and cooled (215°C/hr).
  • Table 7 The composition of the alloy used in weight percent, the balance being Al and inevitable impurities.
  • the material was extruded into a microchannel tube with a 0.3 mm wall on a commercial extrusion press.
  • the microchannel tube surface was zinc arc sprayed at the press exit prior to passing through a water quench.
  • the tubing was coiled at the press and then processed through an offline cut-to-length and sizing operation where a reduction was applied to the tube thickness.
  • FIGS. 4A and 4B show the corresponding surface grain structures as revealed by Poultons macroetch.
  • the “as extruded tube” exhibited only fine grain.
  • the post brazed grain structure after all three treatments was fine except for a narrow band of coarse grain along one size of the tube.
  • the band width corresponded to 6% of the tube width in all three cases.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)

Abstract

L'invention concerne un produit extrudé et brasé présentant une résistance à la corrosion améliorée grâce à une faible formation de grains grossiers recristallisés, ainsi qu'un procédé de fabrication de celui-ci. Le produit extrudé et brasé comprend un alliage d'aluminium comprenant en pourcentage en poids : Mn 0,6-0,75 ; Fe 0,11-0,16 ; Si 0,10-0,19 ; Cu < 0,01 ; Zn < 0,05 ; Ti < 0,05 ; éventuellement un agent d'affinage du grain ; éventuellement Ni < 0,01 ; et le reste étant constitué d'aluminium et des inévitables impuretés.
EP20880265.2A 2019-10-24 2020-10-14 Alliage d'aluminium présentant une aptitude à l'extrusion et une résistance à la corrosion améliorées Pending EP4048823A4 (fr)

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US201962925314P 2019-10-24 2019-10-24
PCT/CA2020/051370 WO2021077209A1 (fr) 2019-10-24 2020-10-14 Alliage d'aluminium présentant une aptitude à l'extrusion et une résistance à la corrosion améliorées

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EP4048823A4 EP4048823A4 (fr) 2023-09-06

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US20220396858A1 (en) 2022-12-15
JP2022554163A (ja) 2022-12-28
MX2022004877A (es) 2022-05-13
CA3156358A1 (fr) 2021-04-29
KR20220085045A (ko) 2022-06-21
AU2020372194A1 (en) 2022-04-21

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