Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
• • 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

Definitions

• the invention relates to an aluminum alloy and a preparation technique thereof, in particular to a magnesium containing high
• Aluminum-silicon alloys especially high-silicon-aluminum-silicon alloys, have a wide range of applications in the automotive industry and the aerospace industry due to their low density, high wear resistance, high corrosion resistance and low coefficient of thermal expansion.
• the aluminum-silicon alloy prepared by the ordinary solidification method there are coarse block-like precipitated Si particles and lath-like eutectic structure in the ingot, which makes the alloy brittle, and it is difficult to further improve the solidification structure and manufacture by plastic processing. High-performance materials in various cross-section shapes, thus limiting the range of applications of the alloy.
• aluminum-silicon alloys have been classified as cast aluminum alloys.
• Direct Chill Casting In the production of industrial pure aluminum and deformed aluminum alloys, Direct Chill Casting (DC casting) has been widely used. People mainly focus on how to reduce alloy composition segregation, reduce grain size and improve surface quality. A technique for preparing a high-silicon aluminum alloy ingot of a large-size specification without any modifier (such as P, Na, Sr) by a semi-continuous casting method has been applied for by one of the inventors of the present invention and obtained a Chinese patent authorization (Patent No. ZL200510119550) .6).
• the object of the present invention is to provide a structural material part containing magnesium high-silicon aluminum alloy and a preparation method thereof, which can be manufactured at low cost by thermoplastic processing and heat treatment without adding any modifier on the casting process.
• Plastic, high-strength magnesium-containing high-silicon deformation aluminum alloy structural material
• the invention specifically provides a structural material part containing magnesium high silicon aluminum alloy, including profiles, bars, plates and forgings, characterized in that:
• the structural material member is prepared by a semi-continuous casting method, and then pre-heat treated
• the particles of the eutectic silicon phase are dispersed, and the final shape and microstructure are obtained by thermoplastic processing and heat treatment, and the strengthening mechanism is fine grain strengthening of the aluminum matrix, particle strengthening of the silicon particles, and precipitation strengthening of the second phase particles;
• the structural material has a Mg content of 0.2 to 2.0% by weight and a Si content of 8 to 18% by weight; a uniformly refined microstructure, an aluminum matrix structure of equiaxed grains, and an average size of ⁇ 6 ⁇ ⁇ , Si and other second phase particles are dispersed and the average size is ⁇ 5 ⁇ ⁇ ;
• the structural material of the magnesium-containing high-silicon aluminum alloy provided by the present invention may further contain one or more of Cu, Zn, Ni, Ti, Fe, and the total content is less than 2% by weight.
• the invention further provides a method for preparing a structural material member of the above magnesium-containing high-silicon aluminum alloy, characterized in that:
• Casting temperature corresponding to the liquidus temperature of the alloy above 150 ⁇ 300 °C ;
• the amount of cooling water around the solidified billet 5 ⁇ 15g/mm-s;
• Heating rate 10 ⁇ 30 °C / min ;
• Heating temperature 450 ⁇ 520 °C ;
• thermoplastic processing The above-mentioned pre-heat treated ingot is subjected to thermoplastic processing, and the process parameters are: deformation temperature: 400 ⁇ 520 ° C;
• Cooling method natural cooling or forced cooling
• thermoplastically processed structural material
• the heat treatment adopts a solution treatment + an artificial aging process:
• Heating rate 10 ⁇ 30 ° C / min
• Solution treatment temperature 500 ⁇ 540 °C ;
• the heat treatment adopts artificial aging or natural aging process: ——The artificial aging parameters are:
• the total rolling reduction is preferably greater than 40%.
• the extrusion ratio is preferably more than 15.
• the forging ratio is more than 40%.
• the key to the invention is to overcome the traditional technical prejudice, and use the traditional semi-continuous casting method for the preparation of magnesium-containing high-silicon aluminum alloy without adding any modifier, and combine the thermoplastic processing and heat treatment to obtain unexpected
• the technical effect is that a new aluminum alloy processing material having fine dispersed silicon particles and a second phase distributed on an equiaxed grain aluminum substrate with good plasticity and high strength is obtained.
• Table 1 exemplifies the extruded silicon aluminum alloy (Al-8.5Si-1.8Mg-0.27Fe, Al-12.7Si-0.7Mg-1.5Cu-0.3Ni-0.3Ti-0.3Fe and Al- prepared by the present invention). 15.5Si-0.7Mg-0.27Fe) Mechanical properties under extrusion and heat treatment, and compared with the mechanical properties of extruded 6063 alloy in Chinese national standard under T5 and ⁇ 6 conditions. Table 1 Comparison of mechanical properties of alloys prepared by the present invention and Chinese national standard 6063 alloy
• 6063 alloy is the most versatile extruded profile alloy, which is widely used in construction, vehicles, decoration and other fields at home and abroad, and has broad market demand. Once the 6063 alloy is partially replaced with a magnesium-containing high-silicon aluminum alloy, it will bring huge economic benefits. In addition, the addition of silicon will save a lot of aluminum resources. BRIEF DESCRIPTION OF THE DRAWINGS
• Figure 1 is a schematic structural view of a semi-continuous casting equipment
• Example 2 is a semi-continuous casting of a typical Al-12.7Si-0.7Mg-0.3Fe alloy (#3) in Example 1 (casting temperature 730 ° C, casting speed 180 mm/min, cooling water flow rate 8 g/mrrrs) As-cast microstructure morphology;
• Figure 3 is a semi-continuous casting of a typical Example 1 AI-12.7Si-0.7Mg-0.3Fe alloy (#3) (casting temperature 730 ° C, casting speed 180 mm / min, cooling water flow rate 8 g / mm, s) High-magnification microstructure of the ingot;
• Figure 4 is a microscopic view of a semi-continuously cast Al-12.7Si-0.7Mg-0.3Fe alloy (#3) in Example 2 after preheating at 500 °C for 2 hr and 470 °C hot extrusion (extrusion ratio 15).
• Fig. 5 is a typical example 3 semi-continuous casting Al-12.7Si-0.7Mg-0.3Fe alloy (#3) preheated at 500 °C for 2 hr, hot extrusion at 470 °C (extrusion ratio 15).
• the microstructure of the post-T6 state solution temperature 540V, time lhr; artificial aging temperature 200 ° C, time 3 hr);
• Figure 6 is a semi-continuous casting of a typical Al-15.5Si-0.7Mg-0.27Fe alloy (# 5 ) in Example 1 (casting temperature 800 ° C, casting speed 140 mm / min, cooling water flow 10 g / mnrs ) ingot The as-cast microstructure morphology;
• Figure 7 is a semi-continuous casting of a typical Al-15.5Si-0.7Mg-0.27Fe alloy (#5) in Example 1 (casting temperature 800 ° C, casting speed 140 mm / min, Cooling water flow rate lOg/mnvs) high-strength as-cast microstructure of the ingot;
• Figure 8 is a diagram showing the microstructure of a semi-continuously cast Al-15.5Si-0.7Mg-0.27Fe alloy (#5) in a typical example 2 after 500 hr preheating for 2 hr and 470 °C hot extrusion (extrusion ratio 45).
• Figure 9 is a typical example 2 semi-continuous casting Al-15.5Si-0.7Mg-0.27Fe alloy (# 5) rectangular casting billet pre-heat treated at 500 ° C for 1 hr, 500 ⁇ hot rolling (compression amount 60%) Post-microscopic morphology;
• Figure 10 is a typical example 3 semi-continuous casting Al-15.5Si-0.7Mg-0.27Fe alloy (# 5) preheated at 500 ° C for 2 hr, 470 ° C hot extrusion (extrusion ratio 45) after T6 state Microstructure morphology (solution temperature 520 ° C, time 2 hr; artificial aging temperature 180 ° C, time 4 hr);
• Figure 11 is a typical example 3 semi-continuous casting Al-15.5Si-0.7Mg-0.27Fe alloy (# 5) rectangular casting blank pre-heat treated at 500 ° C for 1 hr, 500 ° C hot rolling (60% reduction)
• the microstructure of the post-T6 state solution temperature 520 ° C, time 3 hr ; artificial aging temperature 200 ° C, time 4 hr);
• Figure 12 is a typical example 3 semi-continuous casting Al-15.5Si-0.7Mg- 0.27Fe alloy (#5) high-microscopic microscopic micro-microscopic after 200
• Example 13 is a semi-continuous casting of a typical Al-17.5Si-0.7Mg-l.0Cu-0.27Fe alloy (#7) in Example 1 (casting temperature 850 ° C, casting speed 120 mm/min, cooling) Water flow rate 10g/mnvs) The as-cast microstructure of the ingot.
• Example 1 casting temperature 850 ° C, casting speed 120 mm/min, cooling
• the equipment used is self-made equipment, and its structural principle is shown in Figure 1.
• the chemical composition of the alloy is shown in Table 2.
• the casting process parameters are shown in Table 3.
• the pre-heat treatment is heated in the heat treatment furnace at a set heating rate, and after reaching the set temperature, it is kept warm for the set time.
• the plastic deformation is then completed using an extruder, a hot rolling mill and a forging machine.
• the specific process parameters are given in Table 4, Table 5, and Table 6, respectively.
• the structural material part of the magnesium-containing high-silicon aluminum alloy of the invention and the preparation method thereof can be manufactured with good plasticity and high strength at low cost by thermoplastic processing and heat treatment without adding any modifier on the casting process.
• Magnesium-containing high-silicon deformation aluminum alloy structural material is

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• 2008
  • 2008-06-30 EP EP08772999.2A patent/EP2172572B1/en not_active Not-in-force
  • 2008-06-30 CN CN2008101376030A patent/CN101333614B/zh active Active
  • 2008-06-30 CA CA002689332A patent/CA2689332A1/en not_active Abandoned
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  • 2008-06-30 RU RU2009149092/02A patent/RU2463371C2/ru not_active IP Right Cessation
  • 2008-06-30 WO PCT/CN2008/001246 patent/WO2009003365A1/zh active Application Filing
  • 2008-06-30 JP JP2010513624A patent/JP2010531388A/ja active Pending
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