44 results about "Mg element" patented technology

The present invention relates to the technical field of other processing of metals. Disclosed are a free-machining titanium material and a preparation process therefor. The free-machining titanium material comprises: a matrix component group and free-machining component groups, wherein at least one of the free-machining component groups is added to the matrix component group; the matrix component group comprises the following components in percentage by mass: 0-1.0% of Fe, 0-0.08% of N, 0-0.02% of H, 0-0.50% of O, 0-8.0% of Al, 0-15.0% of V, and the balance being titanium and inevitable impurities; and the free-machining component groups are an RE element and S element group, a Cu element and S element group, a Zr element group, a C element group, a B element group, and an Mg element group, respectively. The preparation process involves producing the described free-machining titanium material by using any one of the following three methods: vacuum arc remelting, vacuum floating melting, and powder metallurgy. The present invention solves the technical problem of how to further improve the machinability of titanium materials.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength corrosion-resistant heat-treatment-free die-casting aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 5.5%-7.1% of Mg, 2.5%-3.5% of Si, 0.5%-0.75% of Mn, 0.11%-0.7% of Cu, 0.08%-0.15% of Fe, 0.05%-0.1% of Mo, 0.02%-0.05% of V, 0.01%-0.05% of Zr, 0.03%-0.09% of Y and the balance Al and inevitable impurity elements, the content of a single impurity element is smaller than or equal to 0.02%, and the total content of the impurity elements is smaller than or equal to 0.2%. And the mass ratio of the Mg element to the Cu element in the aluminum alloy components is in the range of (10: 1)-(50: 1). The heat-treatment-free die-casting aluminum alloy provided by the invention is high in yield strength and obvious in weight reduction effect.

The invention discloses a method for improving creep resistance of a rare earth magnesium alloy, which comprises the following steps: S1, casting an ingot blank according to the mass percent of each component (0-6% of Y element, 1-3% of Nd element, 0.1-0.5% of Zr element and the balance of Mg element) in the rare earth magnesium alloy; s2, the ingot blank is subjected to solution treatment; s3, the material obtained after solution treatment is subjected to rolling deformation, the rolling deformation temperature ranges from 450 DEG C to 520 DEG C, the reduction rate ranges from 15% to 25%, and the roller linear speed ranges from 2 mm / s to 200 mm / s; and S4, the rolled and deformed material is subjected to aging treatment, the aging treatment temperature ranges from 180 DEG C to 260 DEG C, and the aging treatment time ranges from 5 h to 70 h. According to the method disclosed by the invention, an originally harmful and unavoidable precipitation-free zone formed along a grain boundary is converted into a precipitation-free zone which is beneficial to creep resistance and is uniformly distributed along an intragranular deformation zone, and the creep resistance is remarkably improved.

The invention provides a 7xxx series aluminum alloy plate strip for anodic oxidation with a high recovery ratio and a preparation method of the 7xxx series aluminum alloy plate strip. The 7xxx series aluminum alloy plate strip comprises the following elements of 0.06%-0.12% of Si element, 0.10%-0.25% of Fe element, 4.5%-5.5% of Zn element, 2.0%-3.0% of Mg element, 1.2%-2.0% of Cu element, 0.05%-0.15% of Mn element, 0.10%-0.15% of Er element, 0.10%-0.12% of Zr element, 0%-0.03% of Ti element and the balance aluminum element. The aluminum alloy plate strip is prepared through the steps of reclaimed material grading pretreatment, low-liquid-level semi-continuous casting, multi-stage homogenizing heat treatment, hot rolling, cold rolling, solid solution, pre-stretching, two-stage aging and the like. Through joint optimization of material components and the process, the finished plate strip has excellent mechanical performance, an oxidation film is uniform in color and luster, and salt mist resistance, friction resistance and the like are achieved.

The invention discloses a novel high-hardness Mg-Al-Ti alloy as well as a preparation method and application thereof. The novel high-hardness Mg-Al-Ti alloy comprises an Mg element, an Al element and a Ti element, and the mass fraction of the Mg element is 30%-50% by weight, the mass fraction of the Al element is 30%-50% by weight, and the mass fraction of the Ti element is 8%-20% by weight. The preparation method comprises the following steps: uniformly grinding raw materials containing an Mg element, an Al element and a Ti element, and pressing into a blank body; the preparation method comprises the following steps: preparing a blank body, heating the blank body to a temperature required by sintering in an inert atmosphere at a heating rate of 4-5 DEG C / min, a temperature required by sintering of 410-435 DEG C and a sintering time of 1-1.5 h, and carrying out in-situ sintering on the blank body to prepare the novel high-hardness Mg-Al-Ti alloy, with the heating rate of 4-5 DEG C / min, the sintering temperature of 410-435 DEG C and the sintering time of 1-1.5 h. The high-hardness novel Mg-Al-Ti alloy provided by the invention is high in density, uniform in component and excellent in mechanical property, and can be widely applied to the fields of aerospace, automobile traffic and electronic products.

The invention provides a magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following elements in percentage by mass: 2.0 to 4.5 percent of Zn element, 1.0 to 2.5 percent of Sm element, 0.5 to 1.5 percent of Cu element, 0.1 to 0.6 percent of Ce element, 0.1 to 0.5 percent of A element, less than or equal to 0.15 percent of inevitable impurities and the balance of Mg element, wherein the element A is selected from any one or more of Ca element, Sr element and Zr element; the heat conductivity of the magnesium alloy ranges from 130 W / (m.K) to 142 W / (m.K), the tensile strength ranges from 260 MPa to 285 MPa, the yield strength ranges from 150 MPa to 170 MPa, and the ductility ranges from 10% to 15%. The magnesium alloy disclosed by the invention has relatively high heat conductivity and relatively high strength, so that the requirement of a high-power integrated light-weight electronic component heat dissipation piece is met.

The invention relates to the technical field of alloy stabilization, in particular to a method for enabling Mg element components of a 6-series alloy to be more stable, which comprises the following steps: in a 6-series alloy smelting stage, adding cerium and lanthanum into a melt according to a ratio, reacting with the alloy to generate a magnesium hydroxide stable phase, adding zirconium in a smelting process stage, and carrying out heat treatment to obtain the 6-series alloy. Carrying out extrusion forming on the alloy with uniformly distributed magnesium, carrying out stepped aging treatment, carrying out heat preservation at 120 DEG C for 8 hours to promote eta'phase precipitation, raising the temperature to 180 DEG C, carrying out heat preservation for 4 hours, and carrying out comprehensive performance detection on the alloy to ensure that the magnesium element is stable and the performance of the alloy reaches the standard so as to obtain a high-quality alloy product. The method solves the problems that the strength is unstable due to segregation of the magnesium element in the 6-series alloy, the corrosion resistance is reduced due to oxidation loss, the thermal responsiveness is reduced after T6 aging due to recrystallization abnormal diffusion (the hardness improvement amplitude is small), and the magnesium element stability and the alloy comprehensive performance optimization are difficult to realize by the existing process.

The invention belongs to the technical field of soluble magnesium alloy rods, and discloses a soluble magnesium alloy rod with enhanced elongation, and the magnesium alloy rod comprises the following chemical components in percentage by mass: 1.5%-14.5% of Gd element, 0.5%-4.0% of Y element, 0.1%-2.5% of Zn element, 0.2%-0.5% of Zr element, 0.01%-0.5% of Li element, 0.01%-0.6% of Ni element, 0.01%-0.5% of Ga element, 0.01%-0.5% of In element, 0.1%-2.0% of Cu element and the balance of Mg element. In component design, various elements are scientifically proportioned, the proportion of Gd to Y and the proportion of Zn to Zr are just right, specific elements are added to form a composite structure, the ductility is improved, the dissolution rate and strength are balanced by means of the Cu element, in the performance aspect, dissolution is accelerated at the high temperature of 200 DEG C, the dissolution rate is increased by 10%-15% compared with the room temperature, the degradation period can be shortened, a dissolved product is fine and uniform, and the degradation rate is high. The biocompatibility and environmental friendliness are excellent, the application field is wide, and degradable medical instruments are covered.

The invention provides an aging strengthening type Cu-Cr-Re-Mg alloy and a preparation device and method thereof, and relates to the technical field of high-performance alloys, and the aging strengthening type Cu-Cr-Re-Mg alloy provided by the invention comprises the following element components in percentage by mass: 6-13.5% of Cr, 0.11-0.95% of Re, 0.04-0.45% of Mg and inevitable impurity content tilt. 0.2%, and the balance being Cu. According to the aging strengthening type Cu-Cr-Re-Mg alloy, the trace element Re is introduced into the aging strengthening type Cu-Cr-Re-Mg alloy, a dispersed high-temperature-resistant phase is generated after aging treatment, and the high-temperature-resistant phase and a Cr phase cooperate to strengthen a copper matrix; and meanwhile, an intermetallic compound can be generated by the added Mg element and Cr, and the effect of multiphase precipitation strengthening of a copper matrix is achieved after aging treatment, so that the hardness of the alloy is greatly improved under the condition that the electric conductivity loss is not large.

The application discloses a vacuum die-casting motor rotor casting aluminum alloy and a preparation method thereof. According to mass percentage, the vacuum die-casting motor rotor casting aluminum alloy comprises the following components: 3.0-6.5% of Ni elements, 0.3-1.0% of Fe elements, 0.2-0.4% of Mg elements, 0.02-0.1% of B elements, 0.1-0.6% of Ce elements, and the rest is Al, and the rest is impurity elements; wherein, the content of a single impurity element is less than 0.03%, and the total content of the impurity elements is less than 0.2%.

The present application relates to a kind of high-strength steel of anti-fatigue and crack arrest and its preparation method, it relates to metal material technical field, it is by the following chemical components by mass percentage composition: C:0.029-0.079%, Si:0.09-0.29%, Mn:1.41-1.69%, Nb:0.019-0.029%, Zr:0.0041-0.0199%, Mg:0.0014-0.0199%, the rest is Fe and inevitable impurity;Zr element and Mg element mass percentage also simultaneously satisfy formula: 0.0041%<Zr+Mg<0.0199%, and Zr / Mg=1-3.The high-strength steel plate of the present application adopts low-carbon, low-silicon, middle-manganese inexpensive chemical composition design, does not contain Cr, Ni, Cu and other valuable metal elements, substantially reduces material cost;The present application does not use traditional Al deoxidation technology, instead is Si-Mn initial deoxidation, Zr-Mg final composite deoxidation, forms small, dispersed and uniform composite oxysulfide, substantially improves plasticity and toughness, significantly improves anti-fatigue performance, is suitable for the high-strength steel of anti-fatigue performance requirement high offshore wind power equipment equipment.

The invention discloses a creep-resistant magnesium alloy with high elasticity modulus and high damping and a preparation method thereof, and the creep-resistant magnesium alloy with high elasticity modulus and high damping comprises the following components in percentage by mass: 1.2%-3.5% of Zn element, 2.5%-12% of Gd element, 0.5%-6% of Yb element, 0.15%-1.2% of Ni element, 0.3%-0.8% of Mn element, 0-0.5% of Cu element, 0.1%-5% of HRE element and the balance of Mg element. The HRE element is one or more of a Dy element, a Sm element and a Tb element, and the mixing enthalpy delta H of the creep-resistant magnesium alloy with the high elastic modulus and the high damping is-1.1 kJ / mol to-0.2 kJ / mol. The creep-resistant magnesium alloy with high elastic modulus and high damping is suitable for the fields of aerospace, precise instruments, transportation, 3C electronics and the like, and has remarkable technical and economic values.

The application provides a cast rare earth magnesium alloy and a preparation method thereof, and relates to the technical field of magnesium alloys. The cast rare earth magnesium alloy comprises the following elements in percentage by mass: the content of Gd element is 4.5-6.50%, the content of Y element is 0.5-2.0%, the content of Nd element is 0.05-1.2%, the content of Er element is 0.05-0.5%, the content of Zn element is 0.3-1.2%, the content of Zr element is 0.3-0.6%, the total content of unavoidable impurities is less than or equal to 0.1%, the content of single impurity is less than 0.05%, and the balance is Mg element. In the application, the addition of Gd element, Y element, Nd element and Er element can weaken the basal texture of the magnesium alloy and improve the plasticity. Controlling the content of each element in the above range is helpful to improve the interaction between the elements, thereby helping the magnesium alloy to realize good strength-plasticity synergy.

The invention belongs to the technical field of preparation of thermoelectric semiconductor materials, and provides a method for synthesizing an Mg3 (Bi, Sb) 2-based material through ball milling in order to solve the problems that in the process of synthesizing a magnesium-based material through a ball milling method, the preparation time is long, and components are not uniform due to material cold welding caking, and the like, and the method comprises the steps that high-purity Bi particles, high-purity Sb particles and high-purity Mg chips are weighed in a glove box under the inert atmosphere; secondly, in a glove box, Bi particles and Sb particles are placed in a ball milling tank, ball milling balls with different diameters are added, and then pre-ball milling is conducted under the inert atmosphere; the preparation method comprises the following steps: pre-ball-milling Bi and Sb powder, adding Mg chips under the protection of an inert atmosphere after pre-ball-milling, fully mixing the ball-milled Bi and Sb powder with the Mg chips, and then ball-milling in the inert atmosphere to obtain the Mg3 (Bi, Sb) 2-based material. By changing the feeding sequence and optimizing the feeding particle size, the specific surface area of the powder is increased, the reaction speed of the powder and the Mg element is increased, and the phenomena of adhesion of the material and the tank wall and cold welding agglomeration are prevented, so that the material synthesis efficiency and the component uniformity are improved.

The invention provides a high-performance Al-Si-Cu-Mg alloy based on in-situ synthesis and a preparation method thereof, and belongs to the technical field of metal materials. AlSi10Mg and an AA-2024 alloy are subjected to ball milling and mixing according to the mass ratio of (3-5): (5-7), and the Al-Si-Cu-Mg alloy is obtained. The Al-Si-Cu-Mg alloy is prepared from, by mass, 4.5%-7.0% of Si, 1.3%-2.4% of Cu, 0.6%-1.1% of Mg and the balance Al, and the content of inevitable impurities is smaller than or equal to 0.1%. And the Al-Si-Cu-Mg alloy is subjected to fusion forming through a laser powder bed, and aging treatment is carried out at 160-200 DEG C for 0.2-8 h, so that the high-performance Al-Si-Cu-Mg alloy is obtained. According to the obtained high-performance Al-Si-Cu-Mg alloy, the density reaches 99.0%-99.6%, cracks are avoided, fine crystal grains are evenly distributed (smaller than or equal to 17 microns), intracrystalline cellular structures are fine (smaller than or equal to 0.57 microns), nanometer strengthening phases are separated out in a dispersed mode (the L phase (needle-shaped metastable phase containing Al, Si, Cu and Mg) is smaller than or equal to 10 nm, and the beta ''-Mg2Si is smaller than or equal to 50 nm). The method is simplified in process, suitable for near-net forming of complex components and high in material utilization rate. And meanwhile, under the condition that the high ductility is kept, high strength is still obtained, the yield strength of the alloy is larger than or equal to 362 MPa, and the tensile strength is larger than or equal to 519 MPa.

The application relates to a rare earth aluminum alloy plate and a preparation method thereof, and has the purposes of solving the problem that the existing aluminum alloy plate is difficult to have high strength and high toughness, and the rare earth aluminum alloy plate comprises the following elements in percentage by mass: the content of Mg element is 4.2-5.0 wt%, the content of Mn element is 0.14-0.20 wt%, the content of Sc element is 0.12-0.20 wt%, the content of Zr element is 0.10-0.13 wt%, the content of Ti element is 0.05-0.15 wt%, the total content of inevitable impurities is less than or equal to 0.15 wt%, the content of single impurity is less than or equal to 0.05 wt%, and the balance is Al element. The addition of the Sc element and the Zr element helps to improve the strength and the toughness of the rare earth aluminum alloy plate. The application is applied to the technical field of aluminum alloy.

The invention relates to an aluminum alloy plate for an attenuation-resistant ultrathin tank cover material, which comprises the following elements in percentage by mass: 0.07-0.15% of Si element, 0.07-0.15% of Al element, 0.07-0.15% of Al element, 0.07-0.15% of Al element and the balance of aluminum element. 0.15 to 0.3 percent of Fe element; 0.07%-0.15% of a Cu element; 0.3 to 0.5 percent of Mn element; 4.75%-4.95% of an Mg element; 0.01%-0.03% of a Ti element; 0.02 to 0.10 percent of Cr element; 0.01%-0.20% of a Zn element; the total content of the inevitable impurities is smaller than or equal to 0.15%; the sum of the mass of the Mn element and the mass of the Cr element in the aluminum alloy plate for the tank cover material is 0.40-0.55%. After the 0.200-0.208 mm ultra-thin 202 series two-piece can easy-open cover prepared from the aluminum alloy is subjected to 90 DEG C / 40 min water boiling aging attenuation, the pressure resistance is larger than or equal to 700 KPa, and the attenuation amplitude is smaller than or equal to 30 KPa.

The application discloses a 7-series aluminum alloy material and a preparation method thereof, and belongs to the field of aluminum alloy preparation. On the basis of optimizing the composition of the 7-series aluminum alloy, the proportion of the components and the process are properly adjusted, so that the tensile strength, yield strength and elongation can be guaranteed to meet the use requirements, and the corrosion resistance can be further improved. The addition of Zn elements and Mg elements can significantly improve the strength and hardness of the 7-series aluminum alloy. The proper proportion of Cu or Cr can reduce residual phases (T phase-Al2Mg3Zn3 phase, AlZnMgCu phase or AlZnMgCr), but the residual phases gradually disappear after solid solution treatment, the alloying elements can be solid-solved in the matrix, the AlFe phase is reduced, and the corrosion sites are reduced. In combination with the synergistic effect of the Mn element and the V-containing refiner, the crystal phase of the 7-series aluminum alloy is refined, the mechanical properties of the 7-series aluminum alloy are significantly improved, and the corrosion resistance of the 7-series aluminum alloy is obviously improved.

The invention discloses a high-strength, high-modulus, light and low-cost magnesium-based multi-component alloy material based on magnesium-containing ternary second phase regulation and control, the magnesium-based multi-component alloy material is Mg-Al-Zn-Cu-Ca alloy, and according to atomic percent, the Mg element accounts for 70%-90%; 4%-18% of Al element; the content of Zn element is 4.5%-7%; the content of the Cu element is 3.5%-6%; 0.5%-2% of Ca element; wherein the magnesium-based multi-component alloy material has a phase structure of alpha-Mg, MgAl < 0.93 > Cu < 1.07 > and Mg32 (Al, Zn) < 49 >; compared with the prior art, on the basis of the Mg-Al-Zn-Cu-Ca alloy and the multi-component alloy design concept, the selective precipitation of a second phase can be realized by reasonably regulating and controlling the content of low-cost Al, Zn, Cu, Ca and other alloy elements and further combining a proper heat treatment process, so that the main precipitated phase is a magnesium-containing ternary high-modulus phase; and further, the elasticity modulus and the mechanical property of the whole alloy are optimized.

The application provides an aluminum alloy plate and a preparation method thereof. The preparation method comprises the following steps: after ingredients of the aluminum alloy plate are proportioned, melting, casting, integrated treatment of soaking and heating, hot rolling and cold rolling are sequentially performed to obtain a cold-rolled coil; the ingredients of the aluminum alloy plate comprise the following components in percentage by mass: 0.6-1.3% of Si element, 0.5-1.1% of Cu element, 0.6-1.2% of Mg element, 0.25% of Cr element, 0.7% of Zn element, 0.2% of Ti element, 0.2% of Zr element and the balance of Al element; the cold-rolled coil is sequentially subjected to solid solution, quenching (multi-stage cooling), straightening and pre-aging to obtain a first finished coil; and the first finished coil is subjected to differential temperature heating artificial aging treatment to obtain the aluminum alloy plate. The production efficiency of the above preparation method is high, and the comprehensive performance of the obtained aluminum alloy plate is good.

The invention discloses a high-strength, high-modulus, high-hardness, light and low-cost magnesium-based multi-component alloy material which is Mg-Al-Zn-Cu-Ca alloy, and the magnesium-based multi-component alloy material comprises the following components in percentage by atomic percent: 70-85% of Mg element, 5-10% of Zn element, 5-10% of Ca element, and the balance of Mg element. 4%-5% of Al element; the Zn element accounts for 9%-16%; 5%-6% of Cu element; the content of Ca element is 0.5%-1.5%; wherein the magnesium-based multi-component alloy material has a phase structure of alpha-Mg, Mg (Al, Zn) 0.93 Cu1.07, Mg32 (Al, Zn) 49, and MgZn2 or MgZn2-Mg (Al, Zn) 0.93 Cu1.07 eutectic crystals, and the magnesium-based multi-component alloy material has a phase structure of alpha-Mg, Mg (Al, Zn) 0.93 Cu1.07 eutectic crystals and a phase structure of Mg (Al, Zn) 0.93 Cu1.07 eutectic crystals. Compared with the prior art, on the basis of the Mg-Al-Zn-Cu-Ca alloy and the multi-component alloy design concept, the selective precipitation of a second phase can be realized by reasonably regulating and controlling the content of low-cost Al, Zn, Cu, Ca and other alloy elements and further combining a proper heat treatment process, so that the main precipitated phase is a magnesium-containing ternary high-modulus phase; and further, the elasticity modulus and the mechanical property of the whole alloy are optimized.

The invention provides a heat-treatment-free aluminum alloy and a preparation method thereof. The heat treatment-free aluminum alloy comprises the following elements in percentage by mass: 5.7-6.2% of Mg element; 2.3 to 2.9 percent of Si element; 1.9%-2.3% of a Zn element; 0.5 to 1.0 percent of Mn element; the total content of the inevitable impurities is smaller than or equal to 0.15%, and the balance is the element Al; the mass content of the MgZn2 phase in the heat treatment-free aluminum alloy is 3.20 to 5.04 percent; the mass content of an Al6Mn phase in the heat treatment-free aluminum alloy is 0.11 to 0.32 percent; the tensile strength of the heat-treatment-free aluminum alloy ranges from 345 MPa to 385 MPa, and the yield strength ranges from 230 MPa to 265 MPa. The aluminum alloy is simple in element composition, the element types and content of the heat-treatment-free aluminum alloy are controlled within the range, and the strength and the casting performance can be both considered.

This invention relates to the field of metallic materials technology, and in particular to an Al-Mg-Zn-Mn alloy, its preparation method, and alloy parts. The Al-Mg-Zn-Mn alloy, by mass percentage, comprises: Mg 3.5%–8%, Zn 0.1%–2%, Mn 0.5%–1.5%, Ti ≤0.02%, with the remainder being Al and unavoidable impurities. This invention introduces appropriate amounts of Mg, Zn, and Mn into the alloy. Furthermore, through heat treatment, the synergistic effect of the T-phase substitution mechanism at grain boundaries and the induction of Mg element aggregation and precipitation within the grains by Al6Mn as a pre-existing compound particle of the T-phase, the content of the T-phase precipitate at grain boundaries is reduced, thus decreasing the continuous precipitation of the T-phase at grain boundaries and improving the overall performance and corrosion resistance of the alloy.

The invention discloses a high-temperature-resistant aluminum alloy material and a preparation technology thereof.The preparation technology comprises the following steps that S1, an aluminum alloy cast ingot is prepared through a fusion casting technology, and the aluminum alloy cast ingot comprises the Mg element, the Zr element, the Ti element and the Er element; s2, the aluminum alloy cast ingot is subjected to two times of homogenization treatment, and an aluminum alloy ingot is prepared; s3, the aluminum alloy ingot is put into an extrusion die to be extruded, and an aluminum alloy plate is prepared; and S4, a cold rolling machining process is conducted, and cold rolling is conducted till the deformation is larger than 70%. The Mg element is added, solid solution strengthening is achieved, and the strength is remarkably improved; by adding the Zr element, the Ti element and the Er element, a nano dispersed phase is formed, and the strength of the aluminum alloy, especially the strength in a high-temperature environment, is remarkably improved; and the Sr element is added to purify the aluminum alloy and improve the plasticity of the aluminum alloy. The total deformation of cold rolling is controlled to be greater than 70%, so that the strength of the high-temperature-resistant aluminum alloy material is improved. The prepared aluminum alloy material meets the requirements of organic capacitor raw materials at the high temperature of 450 DEG C.

The application belongs to the field of laser selective melting (SLM) rapid forming, discloses a Bi element containing magnesium alloy powder for laser selective melting and application thereof, and the magnesium alloy powder is composed of the following components in percentage by mass: Al element: 8.5-9.0%, Zn element: 0.5-1%, Bi element: 1-2%, Mn element: 0.2-0.4%, impurities: ≤0.05%, and the rest is Mg element. Through improvement on the specific composition of the magnesium alloy powder for laser selective melting, the application introduces appropriate Bi element into the magnesium alloy, promotes alloying in cooperation with the SLM process, and the corresponding SLM magnesium alloy forming piece has better tensile strength and yield strength, and the thermal stability of the performance of the forming piece is better.

The invention discloses a screening method for an Al-Si-Mn-Mg quaternary intermediate alloy aiming at a high-melting-point Mn element. The screening method comprises the following steps: 1, setting phase diagram calculation and setting parameters of solidification simulation; 2, calculating a result and a solidification simulation result based on the phase diagram; and 3, intermediate alloy components meeting the screening requirements are confirmed. The screening conditions need to meet three screening conditions at the same time, the condition 1 is that the Si element, the Mn element and the Mg element meet the alloy components Al-(9-11) d Si-(0.5-0.8) d Mn-(0.2-0.5) d Mg, and the parameter d is larger than or equal to 4; the second condition is that the phase content of the intermediate alloy meets the conditions that f (Si) is larger than or equal to 30 mol%, and f (Al8Mn5) is larger than or equal to 5 mol%; and the third condition is that the semisolid temperature interval delta T of the intermediate alloy is larger than or equal to 50 DEG C, and the semisolid interval in the solidification process of the intermediate alloy needs to meet the condition that the solid phase ratio f (s) is equal to 0.2-0.8. The invention further discloses a preparation method of the Al-Si-Mn-Mg quaternary intermediate alloy aiming at the high-melting-point Mn element and a preparation method of the cast Al-Si-Mn-Mg alloy aiming at the high-melting-point Mn element.

The invention provides a 7xxx series aluminum alloy wire and a preparation method thereof, and an aluminum alloy workpiece and a preparation method thereof. The 7xxx series aluminum alloy wire is prepared from the following elements in percentage by mass: 7.0 to 9.0 percent of Zn element, 1.5 to 2.5 percent of Mg element, 0.5 to 1.5 percent of Cu element, 0.05 to 0.35 percent of Sc element, 0.05 to 0.25 percent of Zr element, less than or equal to 0.04 percent of Ti element, less than or equal to 0.15 percent of Fe element, less than or equal to 0.10 percent of Si element, less than or equal to 0.15 percent of inevitable impurities and the balance of Al element, the total mass content of the Sc element and the Zr element is 0.20-0.45%. The 7xxx series aluminum alloy wire is high in strength and not prone to cracking after being subjected to electric arc additive manufacturing and heat treatment, and the requirement for the mechanical property of aluminum alloy in the fields of aerospace and the like can be better met.

The application provides a brazing process of an aluminum alloy material for brazing. The material of a runner plate used in the brazing process is an aluminum rare earth material, which comprises, in percentage by mass, 7.0-9.0% of a rare earth metal element RE, 0.4-0.6% of an Fe element, 0.6-1.2% of an Mn element, 0.3-0.5% of a Cr element, 0.02-0.15% of an Mg element, 0.1-0.2% of a Ti element, 0.02-0.2% of a V element, 0.02-0.1% of a B element, ≤0.1% of an Si element, ≤0.01% of a Cu element, the balance of an Al element and inevitable impurities, and ≤0.05% of a single impurity element. After brazing by the brazing process, the weld is full and has high strength, and the brazing process is suitable for brazing of runner plates with various complex structures.

The invention discloses a low-cost high-toughness aluminum-silicon die-casting alloy and a preparation method thereof, and belongs to the technical field of light alloy materials. The alloy comprises the following components in percentage by mass: 7.0%-10.0% of Si, 0.8%-1.5% of Zn, 0.0%-0.5% of Mg, 0.0%-0.6% of Mn, 0.0%-0.2% of Ti, less than 0.2% of Fe and the balance of Al and inevitable impurities. The core of the invention is that Zn is used as a modificator to replace traditional Sr, eutectic silicon is effectively converted into a fibrous form, and the problems of deterioration decline, porosity increase and poisoning reaction caused by Sr deterioration are avoided. On the basis, Mg element is added to further refine the eutectic silicon structure, and the Mg element is combined with Zn to form a nano precipitated phase reinforced matrix. The alloy has excellent mechanical properties without heat treatment in a die-casting state, the yield strength is 130-160 MPa, the tensile strength is 260-300 MPa, the ductility is 10-16%, meanwhile, the alloy has excellent casting fluidity and heat crack resistance, the cost is low, and the alloy is particularly suitable for integrated die-casting forming of large structural parts of automobiles.

The invention relates to an ultra-fine grain aluminum magnesium alloy and a preparation method and application thereof, the ultra-fine grain aluminum magnesium alloy provided by the invention comprises the following chemical components: 4.0-6.0 wt% of Mg element, and the balance of Al and inevitable impurities; the grain size of the aluminum magnesium alloy ranges from 100 nm to 1000 nm. And an Mg element grain boundary segregation network is arranged at the grain boundary of the aluminum-magnesium alloy. According to the ultra-fine grain aluminum-magnesium alloy provided by the invention, while the strength of the aluminum alloy is guaranteed, through low-temperature aging treatment, a grain boundary structure is precisely regulated and controlled, segregation of Mg elements in a grain boundary area is induced, a stable three-dimensional discontinuous grain boundary segregation network is constructed, and the grain boundary segregation network can effectively reduce grain boundary energy and inhibit grain growth; and therefore, the structure thermal stability of the ultra-fine grain aluminum alloy is remarkably improved.