9 results about "Sr element" patented technology

The application discloses a preparation method of a high-strength cast magnesium alloy, the alloy containing two non-rare-earth strengthening alloy elements of Sr and Ti, wherein the Ti element is preferentially combined with Al to form AlTi or Al3Ti intermetallic compounds and is gathered along the grain boundary, hindering the growth of alpha-Mg grains, the remaining Al element is combined with Mg to form a beta phase, the grain size is reduced, the morphology of the beta phase is improved, and thus the mechanical properties are improved; the Sr element can strengthen the beta phase on one hand, and can consume the Al element at the solidification front by forming a new Al4Sr phase, so that the volume fraction of the beta phase is reduced; in addition, the Sr element can form an adsorption film of strontium on the grain growth interface as a surface active element, so that the grain growth speed is reduced, the alloy has more time to generate more crystal nuclei when solidifying, and the grains are refined; under the synergistic effect of the two elements, the strength of the magnesium alloy is significantly improved.

The invention discloses an Mg-Al alloy with high fluidity and a preparation method thereof, and relates to the technical field of metal materials, the alloy comprises the following components by mass percent: 8.0-10.0% of Al, 0.4-0.6% of Ca, 3.8-4.2% of Sr, trace Zn, Cu, B, Mn, Cr and the balance of Mg, and the ratio of Sr to Ca is greater than or equal to 6. The preparation method comprises the following steps: under a protective atmosphere, melting the raw materials, refining to obtain an alloy melt, and then casting and forming at 710-730 DEG C. Through the synergistic effect of Ca and Sr elements and the optimization of trace elements, the fluidity of the alloy is improved while the low cost and non-rare earth advantages of the alloy are maintained, the problem that mold filling of large thin-wall components in magnesium alloy integrated die casting is incomplete can be effectively solved, and the alloy is particularly suitable for manufacturing of products such as automobile integrated body frames and battery pack shells.

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 application provides a kind of corrosion-resistant magnesium alloy for marine atmospheric environment and a preparation method thereof, and belongs to the field of magnesium alloy material preparation.The chemical composition of the magnesium alloy is as follows in terms of mass percentage: 6.0-6.5% of Al, 1.3-1.5% of Y, 0.3-0.5% of Zn, 0.05-0.1% of Mn, 0.1-0.12% of Sr, and the balance of magnesium and inevitable impurities.The application alloys the magnesium-aluminum alloy by the combined addition of Y, Zn, Mn and Sr elements, suppresses the micro-galvanic corrosion of the magnesium alloy, improves the protection ability of the surface film, and increases the corrosion resistance of the magnesium-aluminum alloy in the marine atmospheric environment.The preparation of the above magnesium alloy adopts semi-solid forming, the process is simple, suitable for industrial production, and the prepared product has a compact structure, reduced defects and excellent service performance.

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 invention discloses a ZL114A alloy and a preparation method thereof as well as a part and a production method thereof. The preparation method comprises the following steps: obtaining a first melt comprising the following components in percentage by weight: less than or equal to 0.1% of Fe; 6.6%-7.4% of Si; cu < = 0.1%; zn < = 0.1%; mn < = 0.1%; 0.55 to 0.75 percent of Mg; 0.08% to 0.15% of Ti; 0.03 to 0.06 percent of Be; less than or equal to 0.05% of other single components; other total impurities are less than or equal to 0.1%; after a modifier and a refiner are heated, online adding is conducted through a wire feeder, and the increment of Ti and Sr elements by the modifier and the refiner ranges from 0.02% to 0.06%; and under the action of an electromagnetic auxiliary device, a semi-continuous casting mode is adopted for casting and forming. The method can effectively promote further refinement of grain structures, reduce formation of coarse combined phases, fully and uniformly diffuse alloy elements, reduce composition segregation, reduce inclusion defects, solve the problems of insufficient feeding, difficulty in mold filling, coarse structures, inclusion pores and the like of original casting parts of traditional aluminum-silicon series cast aluminum alloy, and is good in product quality and low in production cost. Internal defects are few, compactness is high, and the characteristics of high strength and high toughness are achieved.

The present application provides a highly-corrosion-resistant die-casting aluminum alloy and a preparation method therefor, and a housing-type die-cast component. The highly-corrosion-resistant die-casting aluminum alloy comprises the following components in percentage by mass: 8-9 wt% of Si, 0.2-1 wt% of Mg, 0.1-1 wt% of Fe, 0.005-0.05 wt% of Sr, 0.2-1 wt% of Mn, 0.05-0.2 wt% of Ti, 0.05-0.15 wt% of Cr, 0-0.05 wt% of Cu, 0-0.05 wt% of Zn, and the balance of Al and inevitable impurities, wherein the sum of the percentages by mass of the inevitable impurities does not exceed 0.5 wt%. By regulating the content of silicon in the die-casting aluminum alloy, the formability of the aluminum alloy is ensured; by regulating the contents of Cu, Zn, Cr, and Sr elements within the ranges of the present application and appropriately controlling the contents of Si, Mg, Fe, Sr, Mn, Ti, Cr, Cu, Zn, and Al elements, the corrosion resistance of the die-casting aluminum alloy is improved.

The invention discloses corrosion-resistant antibacterial high-strength low-alloy steel, which comprises the following elements in percentage by weight: 0.06 to 0.3 percent of carbon (C), 0.18 to 0.55 percent of silicon (Si), 0.5 to 1.7 percent of manganese (Mn), 0.001 to 0.4 percent of phosphorus (P), 0.002 to 0.06 percent of sulfur (S), 0.01 to 0.2 percent of titanium (Ti), 0.02 to 0.1 percent of vanadium (V), 0.02 to 0.1 percent of niobium (Nb), 0.04 to 0.5 percent of chromium (Cr), 0.02 to 0.3 percent of aluminum (Al), 0.01 to 0.4 percent of nickel (Ni), 0.02 to 0.2 percent of molybdenum (Mo), 0.035 percent or less of nitrogen (N), and 0.03 to 0.6 percent of copper (Cu), antimony (Sb) and strontium (Sr) in total. The low-alloy steel has the beneficial effects that through innovative design of steel components, the tensile strength of the obtained steel reaches 600 MPa compared with existing low-alloy steel; the alloy element type selectivity range is wide, and the universality is improved; and while the excellent mechanical property of the material is guaranteed, the Cu-Nb-V-Sr elements are added, so that the corrosion resistance and the antibacterial property are further improved, and the service life of the steel is prolonged.

This invention provides a Gd2(Ba 4‑r Sr r CuZrO y Nanoparticles and a method for improving the properties of single-domain gadolinium barium copper oxide superconducting bulk materials using the same, wherein the nanoparticles, based on 100 moles, have the following molar ratios: 1 mole of Gd₂O₃, 0-4 moles of BaCO₃, 0-4 moles of SrCO₃, 1 mole of CuO, and 1 mole of ZrO₂; the chemical formula of the nanoparticles is Gd₂(Ba 4‑r Sr r CuZrO y Where r takes values ​​in the range 0 ≤ r ≤ 4, and y is in Gd2(Ba 4‑r Sr r CuZrO y The oxygen content in the powder; this invention replaces RE2Ba4CuMO with Sr element. y A method for extracting Ba from phases (M = U, Mo, Zr, Bi, Nb, W, ...) has led to the development of a chemically stable Gd2(Ba) phase. 4‑r Sr r CuZrO y (r=0, 1, 2, 3, 4) nanoparticles and their complete preparation method, using Gd2(Ba 4‑r Sr r CuZrO y Nanoparticle doping improves the flux pinning ability and superconducting performance of GdBCO superconducting bulk materials.