EP3741880A1 - Blechprodukt mit hoher biegsamkeit und herstellung davon - Google Patents

Blechprodukt mit hoher biegsamkeit und herstellung davon Download PDF

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Publication number
EP3741880A1
EP3741880A1 EP19175448.0A EP19175448A EP3741880A1 EP 3741880 A1 EP3741880 A1 EP 3741880A1 EP 19175448 A EP19175448 A EP 19175448A EP 3741880 A1 EP3741880 A1 EP 3741880A1
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EP
European Patent Office
Prior art keywords
sheet metal
metal product
strip
bending
rolling process
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
Application number
EP19175448.0A
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English (en)
French (fr)
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EP3741880B1 (de
Inventor
David Klaumünzer
Peter Uggowitzer
Sangbong Yi
Dietmar Letzig
Jose Victoria-Hernandez
Jae Joong Kim
Sang-Hyun Kim
Hyun Beom Lee
Oh-Duck Kwon
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.)
Volkswagen AG
Helmholtz Zentrum Hereon GmbH
Posco Holdings Inc
Original Assignee
Volkswagen AG
Helmholtz Zentrum Geesthacht Zentrum fuer Material und Kustenforschung GmbH
Posco Co Ltd
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Publication date
Application filed by Volkswagen AG, Helmholtz Zentrum Geesthacht Zentrum fuer Material und Kustenforschung GmbH, Posco Co Ltd filed Critical Volkswagen AG
Priority to EP19175448.0A priority Critical patent/EP3741880B1/de
Priority to CN202080037242.1A priority patent/CN113840939A/zh
Priority to PCT/IB2020/020025 priority patent/WO2020234655A1/en
Publication of EP3741880A1 publication Critical patent/EP3741880A1/de
Application granted granted Critical
Publication of EP3741880B1 publication Critical patent/EP3741880B1/de
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    • 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
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent

Definitions

  • the invention refers to a method of manufacturing a sheet metal product according to the main body of claim 1 and to a sheet metal product according to the main body of claim 15.
  • Magnesium alloys and sheet metal products manufactured thereof have a high industrial potential, for example in light weight designs.
  • magnesium alloys are a preferred material for sheet metal products.
  • Magnesium alloys typically comprise a very low density, even below the density of aluminum and only 25 % of that of steel. Magnesium alloys have a high stiffness, high specific strength and good damping capacity. These and further known advantageous properties of magnesium alloys, such as good machinability, make them highly attractive for light weight design.
  • a known manufacturing method for sheet metal products is rolling.
  • it is necessary that the rolling process is conducted at elevated temperatures, often in combination with a low thickness reduction degree of the sheet metal strip per rolling pass. This leads to an increased number of rolling passes and hence higher effort which also results in higher production costs.
  • Twin roll casting is a manufacturing method that shows good potential for the production of magnesium strips with improved structural and mechanical properties at affordable costs.
  • the present invention aims at providing an alternative method of manufacturing a sheet metal product and a related sheet metal product with high bendability.
  • a first aspect of the invention refers to a method of manufacturing a sheet metal product, comprising the following steps:
  • the amount of Ca is chosen from an interval [0.1 wt%, 0.4 wt%[.
  • specification of an interval in the format [X, Y[ means that the boundary value X is included in the interval, whereas the boundary value Y is excluded from the interval, but all values below Y down to X are included. Accordingly, specification of an interval in the format [X, Y] means that both boundary values X, Y and all values between X and Y are included in the interval.
  • the method of the invention has revealed a suprising technical effect, if the amount of Ca is reduced below 0.4 wt%. Due to extensive research with amounts of Ca below 0.4 wt% it has been found that the sheet metal product that is manufactured in the method of the invention has significantly improved bendability and corrosion resistance.
  • One aspect of the invention claimed herein is to adopt the teaching of EP 3 205 736 B1 , which is incorporated herein by reference, and modifiy the alloy used, especially under modification of the amount of Ca to a value below 0.4 wt%.
  • the advantageous effects to bendability especially contribute to bending processes performed at demanding bending ratios.
  • the bending ratio is defined as a ratio of a bending radius and a thickness of the sheet metal product. Demanding bending ratios are for example required in hemming processes.
  • the advantageous effect of the invention beneficially applies to such bending processes, even at low temperatures.
  • a corrosion rate of a sheet metal product manufactured by the method of the invention can be 0.43 mm/year or less.
  • a reference magnesium alloy comprising 0.6 wt% Zn and 0,6 wt% Ca, which is beyond the scope of the invention, has a corrosion rate of 2.6 mm/year.
  • the method of the present invention provides a highly formable and highly corrosion resistant sheet metal product, based on an Mg-Zn-Ca alloy system, even if no rare earth elements, Sr or Zr are used. Further, the sheet metal manufacturing via twin roll casting ensures environmental and economic benefits.
  • the sheet metal products obtainable by the method of the invention are beneficial, for example for automobile components. This is due to the fact that a sheet bending operation, for example hemming, can be conducted at a low temperature with a decreased tendency of plastic instability compared to the conventional Mg-based alloys and Mg-alloys containing a high amount of Ca, particularly of at least 0.4 wt% or above.
  • an aspect of the invention covers to apply them to biomedical implants due to the excellent biocompatibility of the alloy system.
  • the use of the specific magnesium alloy in the method of the invention results in excellent formability, especially in bending operations, along with corrosion resistance and homogeneous distribution of alloying elements of the sheet metal product of the invention, while the strength level can be adjusted within a wide range, at low production costs.
  • the Zn content is chosen from 0.2 wt% to 2 wt%, preferably 0.4 wt% to 2 wt%, further preferred from 0.2 wt% to 1 wt% and even further preferred from 0.4 wt% to 1 wt% to decrease the tendency towards embrittlement and increase low-temperature formability.
  • the Ca content is less than 0.4 wt%.
  • the Ca content is chosen within a range from 0.1 wt% to 0.39 wt%, that has revealed best contribution to bendability at different amounts of Zn.
  • the magnesium alloy comprises a Zr content of 0.01 wt% to 0.3 wt%, further preferred from 0.02 wt% to 0.08 wt%.
  • the magnesium alloy contains small quantities of rare earth elements and/or Sr. Some preferred rare earth elements are Sc, Y, La or Gd.
  • the magnesium alloy comprises 0.1 wt% to 1 wt%, further preferred 0.2 wt% to 0.8 wt% and further preferred 0.4 wt% to 0.6 wt% of rare earth elements and/or Sr, related to the total amount of rare elements and Sr. This additionally weakens the texture and improves the mechanical strength of the manufactured sheet metal product.
  • a ratio Zn/Ca is chosen from an interval [2/3, 5/1]. In this range, the amount of a Mg 2 Ca phase in the alloy is significantly reduced.
  • the Zn/Ca ratio is chosen from an interval [1/1, 5/1], e.g. Mg - 0.6Zn - 0.2Ca wt%.
  • this interval research by the applicant has revealed an optimal range that shows best formability results.
  • the Mg 2 Ca phase becomes increasingly dominant and leads to a lower limit of the preferred range at a ratio of 2/3.
  • the Zn content leads to decreased rollability, for example in case of more than 1 wt% Zn at 0.2 wt% Ca.
  • the present invention clearly shows that the benefits of Mg - Zn - Ca alloys can be significantly enhanced by optimization of Zn/Ca ratio, such as texture weakening, improved rollability and high formability. Furthermore, a less amount of secondary phases occurs, which is controllable by the Zn/Ca ratio as a part of the present invention. This is also beneficial to improve the corrosion resistance.
  • Table 1 shows a selection of alloys a that have been tested on bendability and corrosion resistance and delivered very good results. This will be demonstrated in more detail later.
  • Table 1 Alloy nominal (in the format Mg-...wt%Zn-...wt%Ca-...wt%Zr) Ratio nominal (in the format ...wt%Zn/...wt%Ca) Reference Mg-0.2Zn-0.3Ca 2/3 1 Mg-0.6Zn-0.2Ca 3/1 2 Mg-0.8Zn-0.2Ca 4/1 3 Mg-1Zn-0.2Ca 5/1 4 Mg-1Zn-0.2Ca-0.02Zr 5/1 5 Mg-0.6Zn-0.2Ca-0.07Zr 3/1 6
  • a bending operation e) is performed on the sheet metal product.
  • the bending operation e) is performed at a bending ratio of 0.5 or above.
  • the bending ratio is chosen from an interval [0.8, 2.2].
  • the bending ratio may be chosen at a value of more than 2.2 since higher bending ratios lead to decreased technical requirements.
  • the bending operation e) is performed at a temperature chosen from an interval [room temperature, 200 °C].
  • the temperature is chosen from an interval [120 °C, 180 °C].
  • the temperature is chosen at 160 °C.
  • a bending ratio of not more than 2.2 is chosen at room temperature.
  • a bending ratio of not more than 0.8 is chosen at 160 °C.
  • bending operations can be performed on a strip a combination of a small bending ratio and a low temperature, for example at the bending ratio of 0.8 and the temperature of 160 °C or at the bending ratio of 2.2 at room temperature.
  • the improved formability does not deteriorate at the temperature range from room temperature to 200 °C, i.e. no plastic instability during the forming operation at elevated temperature occurs.
  • an initial heat treatment b') is performed on the strip.
  • the initial heat treatment of step b') is performed at 400 °C to 500 °C for 30 min to 1440 min, preferably 300 min to 1440 min.
  • the warm rolling process of step c) is performed at 200 °C to 450 °C, further preferred 250 °C to 450 °C and further preferred 300 °C to 400 °C.
  • the strip formed in the twin roll casting process of step b) and prior to step c) measures 1 mm to 5 mm, preferably 2 mm to 5 mm in thickness and 100 mm to 2000 mm in width.
  • Such range of strip thickness and width which is available using the specific magnesium alloy composition in the method of the invention, is advantageous in terms of cost efficiency of the sheet metal product production and wide applications, e.g. in various automotive components.
  • a temperature of the molten magnesium alloy is controlled to be 680 °C to 750 °C and a peripheral speed of rolls used in the twin roll casting process of step b) is controlled to be 0.7 m/min to 3.5 m/min, preferably 1 m/min to 3.5 m/min.
  • Microstructures and mechanical properties of the sheet metal product can be flexibly tuned in the warm rolling process of step c) and in the subsequent heat treatment of step d).
  • the warm rolling process of step c) the thickness of the strip is reduced.
  • the warm rolling process of step c) is conducted in multiple passes leading to a stepwise reduction of the thickness of the strip.
  • the thickness of the strip can be reduced to the desired thickness of the sheet metal product.
  • the strip is heated up to its rolling temperature in-between of different passes of the warm rolling process of step c).
  • the warm rolling process of step c) introduces deformation and recrystallization of the strip.
  • a higher deformation energy is introduced by a lower rolling temperature as well as for higher degree of thickness reduction in a pass, which beneficially influences the recrystallization process.
  • a high deformation energy assists a homogeneous formation of recrystallization nuclei that leads to fast recrystallization and a higher homogeneity of the microstructure.
  • the microstructural homogeneity of the final sheet metal product obtained by the method of the invention can be easily tuned.
  • the grain size of the material can be tuned.
  • a longer duration of the final heat treatment of step d) leads to an increased grain size and a shorter duration leads to a decreased grain size.
  • the mechanical strength of the sheet metal product is decreased.
  • the mechanical strength of the sheet metal product is increased. In this way the mechanical strength of the sheet metal product can be easily tuned.
  • the method of the invention advantageously allows for tuning the microstructure and homogeneity of the sheet metal product by adjusting the process parameters of the warm rolling process of step c) and the subsequent heat treatment of step d). In this way the mechanical properties of the sheet metal product can be easily tuned.
  • a cold rolling process c') is carried out on the strip.
  • a temperature below 150 °C More preferably the temperature is chosen in a range from 25° C to 100° C, more preferred from 25° C to 50° C. In other words, it is mostly preferred to perform the cold-rolling-process of step c') at ambient temperature.
  • step c' By performing the cold rolling process of step c'), an advantageous, very fine grain structure with an increased homogeneity of the sheet metal product can be achieved in the final heat treatment of step d), due to a large number of recrystallization nuclei. Additionally, the achievable spectrum of grain sizes (and therefore mechanical strength) is significantly enhanced. This means that the average grain size in the material of the sheet metal product as well as its strength is predominantly determined by the warm rolling process of step c) and duration of the subsequent heat treatment of step d).
  • the thickness of the strip is reduced by a rolling degree of 0.05 to 0.3 in the warm rolling process of step c) and/or the cold rolling process of step c').
  • the rolling degree refers to the deformation degree introduced by the rolling in one pass.
  • the rolling degree is calculated by ln(t n-1 /t n ), wherein t n-1 is the thickness of the strip before the n th rolling step and t n is the thicknesses of the strip after the n th rolling step.
  • the rolling degree is 0.05 to 0.3.
  • the thickness of the sheet metal product is determined by the thickness of the strip in the last rolling pass conducted. Depending on the embodiment of the method of the invention this may be the warm rolling process of step c) or the cold rolling process of step c').
  • the thickness of the sheet metal product can be adjusted as desired.
  • the thickness of the final sheet metal product measures 0.2 mm to 3.5 mm, more preferably 0.8 mm to 2.0 mm.
  • the content of unavoidable impurities is less than 50 ppm in total in all process steps.
  • the tolerable value individually refers to the content of each unavoidable impurity contained in the magnesium alloy.
  • Some very critical impurities are Fe, Cu and Ni.
  • the content of the unavoidable impurities is preferably controlled in all process steps a) to d), as well as b') and c') of the method of the invention.
  • the invention further refers to a sheet metal product, obtained or obtainable by the method of the invention. Application in transport industry or as biomedical implants.
  • an ultimate tensile strength is in the range from 200 MPa to 325 MPa and/or a yield strength is in the range from 125 MPa to 275 MPa while a low-temperature formability measures at least 6 on the Erichsen index.
  • the tensile strength of the sheet metal product can be tested at room temperature and a strain rate of 10 -3 /s using a tensile sample having a gauge length of 25 mm.
  • the Erichsen index is referred to as an index indicating formability of a sheet metal sample.
  • the Erichsen index is the displacement of a spherical punch obtained at the moment of fracture of the sheet metal sample fixed at a blank holding force of 10 kN.
  • the spherical punch has a diameter of 20 mm and moves at speed of 5 mm/min.
  • the sheet metal product of the invention It is an advantage of the sheet metal product of the invention that a broad range of mechanical properties is covered while the low-temperature formability remains on a very high level throughout. This makes the sheet metal product of the invention highly attractive for applications in the transportation industry.
  • a vehicle structure for example a car body
  • each component bears different mechanical specifications thus requiring a broad range of mechanical properties referring to the sheet metal product used for the component.
  • Some examples are mounting structures and outer skin panel parts.
  • the sheet metal product of the invention is thus capable of covering a wide spectrum of requirements and fields of applications without the need of changing the alloy system.
  • the sheet metal product of the invention comprises a grain size in a range from 3 ⁇ m to 30 ⁇ m.
  • the mechanical strength of the sheet metal product of the invention strongly depends on the grain size, a wide spectrum of mechanical strength can be covered.
  • the sheet metal product of the invention comprises at least one mechanical property that does not vary by more than 30 % in all planar directions of the sheet metal product.
  • the term mechanical property herein refers to actual material properties, rather than to sheer geometrical properties.
  • a number of mechanical properties do not vary by more than 30 %.
  • the mechanical property or the mechanical properties do not vary by more than 20 %, further preferred 10 % and further preferred 5 %.
  • the sheet metal product of the invention advantageously comprises isotropic properties.
  • Figure 1a illustrates a sheet metal product 10, manufactured according to steps a) to d) of the method of the invention.
  • the sheet metal product 10 according to the invention consists of an alloy specified by Refrence 2 in Table 1 from the description above and accordingly comprises 0.6 wt% Zn and 0.2 wt% Ca in a Mg matrix.
  • a bending operation according to step e) of the method of the invention is performed on the inventive sheet metal product 10.
  • a hemming operation is performed on the sheet metal product 10, connecting the sheet metal product 10 to another sheet metal product 12.
  • the hemming operation is done at a bending ratio (r/t) of about 0.83, resulting from an initial bending radius r of the sheet metal product 10 of 1 mm and a thickness t of the sheet metal product 10 of 1.2 mm.
  • a temperature T during the hemming operation is set to 160 °C.
  • the AZ31 sheet metal product 14 in the middle shows first cracks 16 in the material, which occurred at a temperature T of 200 °C.
  • the lower AZ31 sheet metal product 14 shows severe cracks 16 at 160 °C.
  • the sheet metal product 10 according to the invention is shown on top. It is clearly visible, that no cracks are in the material, on the contrary to the prior art AZ31 sheet metal product 14 shown in the lower part of Figure 1 b. This is due to the significantly enhanced bendability of the sheet metal product 10 according to the invention.
  • FIG. 1c another sheet metal product 18 is shown, which has been manufactured identically with sheet metal product 10, but from an alloy comprising 0.6 wt% Ca, thereby not lying within the scope of the invention.
  • the significant effect of the amount of Ca can be seen, leading to significant cracks 16 at an amout of 0.4 wt% Ca or more.
  • Figures 2a-f show results of measures of stretch formability of different alloys used in the method of the invention.
  • the scales shown in Figures 2a-f are in cm.
  • the measures of stretch formability took place by measuring deformation height h of different sheet metal products 10 according to the invention.
  • the sheet metal products 10 with Reference 2 in Table 1 clearly show the best stretch formability and is the same sheet metal products 10 as shown in Figure 1c .
  • the sheet metal products 10 of Reference 2 represent a preferred embodiment of the sheet metal product 10 of the invention.
  • the alloys of the sheet metal products 10 in Figures 3b to 3d correspond to References 2 to 4 in Table 1 in this order.
  • none of the sheet metal products 10 comprises any cracks in the material after bending, since all the shown sheet metal products 10 have been manufactured in the method of the invention.
  • Figure 3a shows a sheet metal product 10 made of an alloy based on Reference 1 in Table 1 but modified with regard to the ratio Zn/Ca which lies below 2/3. This means the ratio Zn/Ca ranges slightly below the preferred range of the method of the invention.
  • the respective alloy reveals a first tendency towards forming cracks 16 under the demanding bending ratio of about 0.83 in this example.
  • Figure 4 illustrates correlation 22 of a bending ratio r/t and a temperature T in a bending operation of step e) of the method of the invention.
  • the correlation 22 shows that crack-free bending is possible in a process window between a bending ratio r/t of 2.2 at 20 °C and a bending ratio r/t of 0.8 at 160 °C.
  • energy-efficient bending and a high-quality sheet metal product 10 are achievable at the same time.
  • a linear correlation 22 can be assumed inside the process window.
  • Figures 5a-c show backscatter electron images of a sheet metal product 10 produced by the method of the invention.
  • Figure 5a shows a sheet metal product 10 consisiting of an alloy according to Reference 1 of Table 1: Mg - 0.2Zn - 0.3Ca.
  • Figure 5b shows a sheet metal product 10 consisiting of an alloy according to Reference 2 of Table 1: Mg - 0.6Zn - 0.2Ca.
  • Figure 5c shows a sheet metal product 10 consisiting of an alloy according to Reference 5 of Table 1: Mg - 1.0Zn - 0.2Ca alloy.
  • the alloy of Figure 5a has a relatively high amount of the particles 24 corresponding to Mg 2 Ca phases within the matrix and at the grain boundaries.
  • the alloy of Figure 5b which is a preferred embodiment, has significantly less particles 24 comparing to the alloy of Figure 5a .

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  • 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)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP19175448.0A 2019-05-20 2019-05-20 Blechprodukt mit hoher biegsamkeit und herstellung davon Active EP3741880B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19175448.0A EP3741880B1 (de) 2019-05-20 2019-05-20 Blechprodukt mit hoher biegsamkeit und herstellung davon
CN202080037242.1A CN113840939A (zh) 2019-05-20 2020-05-20 具有高的可弯曲性的钣金产品及其制造
PCT/IB2020/020025 WO2020234655A1 (en) 2019-05-20 2020-05-20 Sheet metal product with high bendability and manufacturing thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19175448.0A EP3741880B1 (de) 2019-05-20 2019-05-20 Blechprodukt mit hoher biegsamkeit und herstellung davon

Publications (2)

Publication Number Publication Date
EP3741880A1 true EP3741880A1 (de) 2020-11-25
EP3741880B1 EP3741880B1 (de) 2023-06-28

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EP19175448.0A Active EP3741880B1 (de) 2019-05-20 2019-05-20 Blechprodukt mit hoher biegsamkeit und herstellung davon

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EP (1) EP3741880B1 (de)
CN (1) CN113840939A (de)
WO (1) WO2020234655A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006028548A (ja) 2004-07-13 2006-02-02 Toyota Central Res & Dev Lab Inc 塑性加工用マグネシウム合金およびマグネシウム合金部材
EP2644728A2 (de) 2010-11-23 2013-10-02 Postech Academy-industry Foundation Magnesiumslegierungsblech mit hervorragender formbarkeit bei raumtemperatur und herstellungsverfahren dafür
US20150047756A1 (en) * 2011-11-07 2015-02-19 Toyota Jidosha Kabushiki Kaisha HIGH STRENGTH Mg ALLOY AND METHOD FOR PRODUCING SAME
DE112014002336T5 (de) 2013-05-07 2016-01-21 Baoshan Iron & Steel Co., Ltd. Kostengünstiges feinkörniges Magnesiumlegierungsblech mit schwacher Textur und Verfahren zur Herstellung desselben
EP3205736A1 (de) 2016-02-11 2017-08-16 Volkswagen AG Mittels doppelwalzengiessen hergestelltes magnesiumlegierungsblech

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4332889B2 (ja) * 2003-05-30 2009-09-16 住友電気工業株式会社 マグネシウム基合金成形体の製造方法
JP5467294B2 (ja) * 2008-06-05 2014-04-09 独立行政法人産業技術総合研究所 易成形性マグネシウム合金板材及びその作製方法
CN106715737B (zh) * 2014-09-09 2018-12-04 国立大学法人神户大学 生物体软组织固定用器件及其制作方法
US20180087133A1 (en) * 2015-04-08 2018-03-29 Baoshan Iron & Steel Co., Ltd. Formable magnesium based wrought alloys
CN106148784B (zh) * 2015-04-20 2019-03-19 中国科学院金属研究所 一种低成本室温高塑性变形镁合金材料及其制备工艺

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006028548A (ja) 2004-07-13 2006-02-02 Toyota Central Res & Dev Lab Inc 塑性加工用マグネシウム合金およびマグネシウム合金部材
EP2644728A2 (de) 2010-11-23 2013-10-02 Postech Academy-industry Foundation Magnesiumslegierungsblech mit hervorragender formbarkeit bei raumtemperatur und herstellungsverfahren dafür
US20150047756A1 (en) * 2011-11-07 2015-02-19 Toyota Jidosha Kabushiki Kaisha HIGH STRENGTH Mg ALLOY AND METHOD FOR PRODUCING SAME
DE112014002336T5 (de) 2013-05-07 2016-01-21 Baoshan Iron & Steel Co., Ltd. Kostengünstiges feinkörniges Magnesiumlegierungsblech mit schwacher Textur und Verfahren zur Herstellung desselben
EP3205736A1 (de) 2016-02-11 2017-08-16 Volkswagen AG Mittels doppelwalzengiessen hergestelltes magnesiumlegierungsblech

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EP3741880B1 (de) 2023-06-28
WO2020234655A1 (en) 2020-11-26
CN113840939A (zh) 2021-12-24

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