37results about How to "Refined casting structure" patented technology

The invention relates to an electroslag remelting technique, in particular to a vacuum/gas shield electroslag remelting continuous directional solidification device and method. The device comprises a power supply, a consumable electrode (1), a water-cooling crystallizer (2) and a gas shield system, wherein the lower part of the water-cooling crystallizer (2) is provided with a water-cooling chassis (7) and a stripping device (13), and a two-circuit control mode is adopted by the consumable electrode (1) to make the stripping speed equivalent with the solidification speed of a cast ingot. The invention has simple operation and low cost, is convenient to control, can be used for producing large-dimension low-segregation directional solidification cast ingots and is suitable for mass production and application.

The invention relates to a high-energy-absorptivity aluminum alloy for automobile bodies, which comprises the following components in percentage by weight: 0.56%-0.64% of Mg, 0.42%-0.50% of Si, 0.17%-0.19% of Cu, 0.20%-0.22% of Fe, 0.028%-0.032% of Mn, 0.028%-0.032% of Cr, 0.028%-0.032% of Zn, 0.29%-0.31% of Ti, 0.29%-0.31% of Zr and the balance of Al. The preparation method comprises the following steps: preparing components according to weight percents, melting by heating to 740-750 DEG C, cooling, standing,, refining, and casting into a 250-300 DEG C iron mold; and carrying out homogenizing treatment on the cast ingot at 560 DEG C for 9 hours, quickly cooling with water, heating, extruding, carrying out water or fog quenching, and carrying out artificial aging at 180 DEG C. The invention has the advantages of reasonable component proportion, simple operating technique and favorable hot extrusion formability.

The invention discloses a TiAl alloy plate rapid preparation method. The preparation method comprises the steps of preparation of a TiAl alloy plate blank, sheathing of the TiAl alloy plate blank, early-stage sheath rolling of a TiAl alloy, later-stage sheath rolling of the TiAl alloy, stress relief annealing and sheath removing. Through the method, the Al content of the TiAl alloy is not higher than 44.5%, it is ensured that a high-temperature structure of the alloy contains a certain number of unordered phases beta and phases alpha before rolling, and the alloy has excellent deformability. Rapid high-efficiency rolling on the plate can be implemented at low rolling temperature and large pass deformation, the whole rolling period is short, refining of crystal particles is facilitated, andthe mechanical performance of the plate is finally improved. The preparation method has the advantages that the process is simple, the cost is low, and the high-quality non-defective TiAl alloy platecan be prepared.

The invention provides graphene reinforced hypereutectic aluminum-silicon alloy and a preparation method of the graphene reinforced hypereutectic aluminum-silicon alloy. According to the chemical components, the graphene reinforced hypereutectic aluminum-silicon alloy comprises, by mass percentage, 18.0%-20.0% of Si, 0.45%-0.70% of Mg, 0.001%-0.009% of graphene, 0.1%-0.3% of Zr, smaller than or equal to 0.2% of Zn, smaller than or equal to 0.1% of Mn, smaller than or equal to 0.1% of Ti, smaller than or equal to 0.1% of Be, smaller than or equal to 0.05% of Sn, smaller than or equal to 0.1% ofPb, smaller than or equal to 0.03% of each of other unspecified impurity elements, smaller than or equal to 0.10% of total impurity elements and the balance Al. The content of graphene in the provided graphene reinforced hypereutectic aluminum-silicon alloy is much smaller than that of graphene of existing graphene composite aluminum alloy, the cost is reduced, the comprehensive mechanical properties of the obtained graphene reinforced hypereutectic aluminum-silicon alloy are remarkably improved, and the application of the graphene reinforced hypereutectic aluminum-silicon alloy in the industrial field is broadened.

The invention belongs to the field of preparation of a TiAl alloy and a composite material adopting the TiAl alloy as a matrix, and relates to an in-situ self-generated TiB2 whisker-reinforced TiAl-based composite material and a preparation method thereof. The invention is applicable to the TiB2/TiAl composite material and the preparation method thereof. Through a formula for calculating the controlled quantity of B elements added into the TiAl alloy mentioned by the invention, the appropriate amount of B elements is added into the TiAl alloy, an in-situ self-generated slim secondary TiB2 whisker obtained through the eutectic reaction of L to beta+TiB2 and L+beta to alpha+TiB2 is formed in the TiAl alloy, and meanwhile, the production of a thick granular primary TiB2 phase is avoided, so that the TiB2 whisker-reinforced TiAl-based composite material can be obtained. Then, the TiB2/TiAl composite material prepared through an ingot metallurgy method is treated through a unique triple heat treatment process, so that a fine-grain mesh basket-shaped structure and a fine-grain full lamellar structure can be obtained. The TiB2/TiAl composite material has excellent creep resistance and durability at the high temperature of 760 DEG C to 800 DEG C, and meanwhile, has better room-temperature ductility so as to have a favorable application prospect in the aerospace field.

The invention provides an aluminum alloy material for a cable. The aluminum alloy material comprises the following components of, by weight, 0.01-0.03% of Cu, 0.002-0.006% of Ca, 0.003-0.009% of V, 0.001-0.02% of Sn, 0.005-0.012% of Be, 0.002-0.01% of Bi, 0.001-0.005% of Sr, 0.16-0.32% of modified graphene, 0.06-2.3% of Re, and the balance Al and impurities. The modified graphene is mainly prepared by nano nickel oxide, silver powder, bismuth oxide, zinc powder and graphene powder. The aluminum alloy material for the cable is high in electrical conductivity, and good in creep-resistant performance and fatigue-resistant performance.

The invention belongs to the technical field of aluminum alloy, and particularly relates to a precise forming aluminum alloy material suitable for a high-toughness structural part of a new energy automobile and a preparation method of the precise forming aluminum alloy material. 5.0 wt% to 7.0 wt% of Mg; zr: 0.2 wt% to 0.6 wt%; 0.1 wt% to 0.5 wt% of Sm; gd: 0.5 wt% to 0.8 wt%; cu: 0.8 wt% to 1.2 wt%; 0.6 wt% to 1.0 wt% of Zn; fe: lt; the aluminum alloy comprises the following components in percentage by weight: 0.5 wt% of Al, 3.0 wt%-7.0 wt% of silicon carbide whiskers, the sum of inevitable impurities such as Ti, B, Ca and the like is controlled to be 0.1 wt% or below, and the balance of Al. The yield strength of the material reaches 410-510 MPa, the tensile strength reaches 310-350 MPa, and meanwhile the ductility of the material is not lower than 12%.

The invention provides an Al-Cu-Mg-Zr series aluminum alloy for a cable. The Al-Cu-Mg-Zr series aluminum alloy comprises the following components of, by weight, 0.03-0.09% of Cu, 0.01-0.03% of Zr, 0.02-0.08% of Mg, 0.2-0.4% of modified graphene, and the balance Al and impurities. The modified graphene is mainly prepared from nano-TiO2, Fe powder, lanthanum oxide, zinc powder and graphene powder. The aluminum alloy not only has low resistivity, but also has good creep resistance.

The invention relates to an aluminum alloy for casting an engine cylinder cover. The aluminum alloy is prepared from the following components in percentage by mass: 6.5 to 7.5 percent of Si, 0.25 to 0.45 percent of Mg, less than or equal to 0.17 percent of Fe, 0.08 to 0.25 percent of Ti, 0.005 to 0.015 percent of Sr and the balance of Al. The invention further relates to a preparation method of the aluminum alloy. The preparation method comprises the following steps: preparing the materials according to the above component requirements; heating pure aluminum ingots and pure silicon in a crucible furnace to 760 +/- 10 DEG C to melt the pure aluminum ingots and the pure silicon; pressing a pure magnesium, aluminum and titanium intermediate alloy into the bottom of an aluminum and silicon solution with a bell jar, and controlling the temperature at 810 to 860 DEG C for alloying; after the alloying is completed, controlling the temperature between 740 +/- 10 DEG C, and adding an aluminum-strontium intermediate alloy AlSr; feeding high-purity nitrogen for gas removal; adding a covering agent; performing stewing and drossing; and pouring an alloy solution into a preheating die to obtain the aluminum alloy for casting the engine cylinder cover. After the aluminum alloy is subjected to T6 thermal treatment, the tensile strength of the aluminum alloy is 305 to 325 MPa, the yield strength is 240 to 260 MPa, the hardness is 90 to 110 HBS, and the ductility is up to 6 percent; and the strength and the toughness can meet the performance requirements of an engine cylinder cover product.

The invention provides an Al-Cu-Sr-RE-Ge aluminium alloy wire for a power cable and a preparation method thereof. The Al-Cu-Sr-RE-Ge aluminium alloy wire comprises the following components: 0.4-0.8wt%of Cu, 0.15-0.36wt% of Sr, 0.12-0.32wt% of RE, 0.13-0.28wt% of Ge, 0.11-0.18wt% of Si, 0.02-0.09wt% of Co, 0.03-0.07wt% of Ca, 0.01-0.05wt% of Cr and the balance of Al and unavoidable impurities. Thepreparation method comprises the following steps: 1, smelting and pouring; 2, quenching at 505-520 DEG C, and carrying out aging treatment at 210-225 DEG C; 3, extruding into an aluminium alloy rod at 485-510 DEG C; 4, drawing into a first aluminium alloy wire at 290-310 DEG C; 5, drawing into a second aluminium alloy wire with the diameter of 1-2.5mm at 330-360 DEG C; and 6, carrying out thermalinsulation on the second aluminium alloy wire for 3-5 hours at 350-380 DEG C, then reducing the temperature to 230-260 DEG C, carrying out thermal insulation for 6-10 hours, and air cooling to the room temperature. The Al-Cu-Sr-RE-Ge aluminium alloy wire has excellent electric conductivity and heat resistance and is high in strength, toughness and fatigue resistance.

The invention provides an Al-Cu-Mg-Mn-series aluminum alloy for a cable. The Al-Cu-Mg-Mn-series aluminum alloy comprises the following components of, by weight, 0.03-0.09% of Cu, 0.2-0.4% of Mn, 0.02-0.08% of Mg, 0.04-0.08% of Sc, 0.2-0.4% of modified graphene, and the balance Al and impurities. The modified graphene is mainly prepared by nano-TiO2, Fe powder, lanthanum oxide, zinc powder and graphene powder. The aluminum alloy is low in resistivity, and good in creep-resistant performance and fatigue-resistant performance.

The invention relates to a preparation method of a novel 7XXX aluminum alloy thin strip with high performance by jet casting, which comprises the following steps of: 1) smelting according to the following chemical components in percentage by weight: 4.8 to 6.3 percent of Zn, 1.6 to 2.5 percent of Mg, 1.6 to 2.5 percent of Cu, 0.1 to 0.15 percent of Zr and the balance of Al and other inevitable impurities; the single impurity content is less than or equal to 0.1%, and the total impurity content is less than or equal to 0.2 (2) nano-particle enhancement; 3) spray deposition and continuous casting; 4) cooling; 5) primary hot rolling; (6) cooling and secondary hot rolling; (7) coiling; and 8) post-processing. Compared with an existing 7XXX aluminum alloy, the 7XXX aluminum alloy thin strip cast and rolled through the spray deposition combined double-roller thin strip cast rolling technology has the advantages that the strength is improved by 25% or above, and the ductility is improved by 35% or above; compared with a steel plate, the weight is reduced by 50% or more.

The invention discloses a high-heat-strength aluminum-silicon alloy material and a manufacturing method thereof. According to the technical scheme, the high-heat-strength aluminum-silicon alloy material is characterized by comprising, by mass, 8.5%-10% of Si, 3.0%-4.5% of Cu, 2.0%-3.0% of Ni, 1.0%-2.5% of Mg, 0.05%-0.3% of Zr, 0.05%-0.3% of Ti, 0.05%-0.3% of Er, 0.05%-0.23% of Pt and the balance Al. The high-heat-strength aluminum-silicon alloy material has the advantages that the better high-temperature creep resistance and the better high heat strength are achieved, grains are refined, and the metallographic structure is more uniform.

The invention relates to a jet cast rolling high-performance 7XXX aluminum alloy thin strip and a preparation method thereof, the aluminum alloy thin strip comprises the following components in percentage by mass: 4.8-6.3% of Zn, 1.6-2.5% of Mg, 1.6-2.5% of Cu, 0.1-0.15% of Zr, 0.01-0.08% of Ti, 0.001-0.008% of B, and the balance of Al and other inevitable impurities, the content of a single impurity is less than or equal to 0.1%, and the content of total impurities is less than or equal to 0.2%. Compared with an existing 7XXX aluminum alloy, the 7XXX aluminum alloy thin strip prepared through the spray deposition and double-roller thin strip cast rolling combined technology has the advantages that the strength is higher by 20% or above, and the ductility is higher by 30% or above; compared with a steel plate, the weight is reduced by more than 40%. The produced aluminum alloy thin strip can be widely applied to the field of aerospace, such as various aircraft fuselages, wing beams, cabin wallboards, aircraft high-stress structural parts, aircraft skins, high-strength structural parts in aircraft rockets and the like, and a wide space can be provided for aerospace high strengthening, light weight, energy consumption reduction and fuel economy improvement.