39results about How to "Large lattice distortion" patented technology

The invention provides a high-hardness Al-Cr-Ti-V-Cu light-weight high-entropy alloy and a preparation method thereof, belonging to the field of metal materials and preparation. The main components of the high-entropy alloy are composed of: Al 20-25%, Cr 20-25%, Ti 20-25%, V 20-25%, Cu 0-20%, and Cu 0-20%. The content is not 0. The phase structure of the alloy is mainly characterized by a gradual transformation from a single-phase structure to a multi-phase structure, mainly from a single BCC phase structure to a BCC+FCC phase and a small amount of HCP phase structure, and finally to FCC+HCP. phase structure. And showed high hardness above 650HV and good thermal stability. The invention also provides a preparation method of the Al-Cr-Ti-V-Cu high-entropy alloy, which adopts vacuum arc melting and direct casting to obtain an alloy ingot; the preparation process is pollution-free, low in energy consumption and low in cost.

The invention relates to chemical plating on a surface of a metal material and particularly to a Ni-Cu-P-Ce alloy plating layer used for chemical plating on a surface of a low-carbon steel base material and a preparation process of the Ni-Cu-P-Ce alloy plating layer. The Ni-Cu-P-Ce alloy plating layer adopts a plating liquid composed of 35-40 g / L of nickel sulfate, 0.2-0.4 g / L of copper sulfate, 25-30 g / L of sodium hypophosphite, 8-10 g / L of sodium acetate, 25-30 g / L of trisodium citrate, 22-28 ml / L of lactic acid, 8-10 g / L of butanedioic acid, 0.2-0.4 g / L of cerium nitrate, 8 mg / L of potassium iodide, 1.5 mg / L of thiourea, 0.01 g / L of glycine and 0.2 g / L of ammonium bifluoride. For the adoption of ultrasonic chemical plating, a plating layer material formed by codeposition of Ce, Cu and Ni is obtained; and the material has increased compactness, is a microlithic texture, and is high in hardness and strong in corrosion resistance.

The present invention discloses a tellurium-doped MXene composite material and a preparation method thereof, comprising the following steps: (1) adding MXene and a tellurium source into a dispersant to prepare a dispersion, and then stirring the dispersion; (2) heating the dispersion, reacting, and then cooling; (3) centrifuging the product obtained in the step (2), then washing and drying under vacuum; and (4) placing the dry product obtained in the step (3) into a corundum ark, and then transferring into a tubular furnace, heating under the protection of inert gas, retaining the temperature, and then cooling to obtain the tellurium-doped MXene composite material. The composite material prepared by the present invention can be used as a cathode of a potassium ion battery, which increases the interlamellar spacing, and optimizes an ion diffusion channel, so that the electrochemical performance of the potassium ion battery is improved.

The invention discloses REO (rare earth oxide)-doped GZ (gadolinium zirconate) powder for PS-PVD (plasma spray physical vapor deposition) and a preparation method of the REO-doped GZ powder, and relates to the technical field of processing of GZ ceramic materials. The method comprises the following steps: gadolinium salt, zirconium salt and one of ytterbium salt or scandium salt are mixed uniformly in the mole ratio of (0.3-0.9):1:(0.1-0.7), deionized water is added, a mixed solution is obtained and subjected to single-phase sedimentation treatment, filtering and drying are performed, and a solid product is obtained; wet ball milling and dry ball milling are performed on the solid product sequentially, a ball milling product is filtered, a product is dried and then subjected to ball milling and uniform mixing with deionized water, a binder and a dispersant, and slurry is obtained; pH of the slurry is regulated, spray drying is performed, and granules are obtained; the granules are sintered in a sintering furnace, powder with diameter smaller than 18 mu m and larger than 50 mu m is screened out, fine powder and coarse powder are mixed uniformly, and the REO-doped GZ powder for PS-PVD is obtained. Flowability of the fine powder is improved while the gasification effect of the powder is guaranteed.

The invention provides best strain of an austenitic stainless steel container welding residual stress overload reducing method. The best strain of the austenitic stainless steel container welding residual stress overload reducing method comprises: (1) a best value exists in overload dependent variable for reducing welding residual stress, the dependent variable corresponding to first major principal stress in direction in a continuous structure zone serves as an evaluation index and overload plastic strain is in a range of 2%-5%; (2) in the process of overload, boosting speed is controlled through a variable frequency pump or an automatic control reflux valve, uploading speed is in a range of 0.2 MPa / min-0.4 MPa / min and the dependent variable is controlled through deformation measurement or strain measurement; and (3) when a container is manufactured, a tensile test is firstly performed to materials, design stress and overload stress are determined according to an actual single tensile curve of the materials and design pressure and overload pressure are calculated through a simplified method. Numerical modeling has universality and generality, evaluation stress is corroded, first tensile welding residual stress is reduced to a great extent and the residual stress after reduction is in the same level with residual stress of a cold rolling plate rear base material and residual stress after stress relief heat treatment.

The invention discloses a method for preparing an oxide dispersion strengthened iron-base alloy, and belongs to the technical field of metal dispersion strengthening. The method comprises the following steps of: taking iron blocks, a Fe-Mn alloy and an Ni-Al alloy as raw materials, performing a vacuum smelting and electroslag smelting duplex process to obtain a pure intermediate alloy cast ingot; crushing the intermediate alloy cast ingot in a crusher with protective atmosphere to obtain intermediate alloy powder; and performing high-energy ball-milling on intermediate alloy powder, matrix powder and oxide powder to obtain the oxide dispersion strengthened iron-base alloy. Oxide dispersion strengthened iron-base alloy powder is subjected to hot isostatic pressing treatment and thermal treatment to obtain the final oxide dispersion strengthened iron-base alloy. The method adopts the duplex smelting process, so that content of oxygen and nonmetal impurities in cast ingot is effectively reduced; the alloyed intermediate alloy prevents oxidization of an element Mn, ball-milling time can be shortened and energy consumption is reduced. The prepared oxide dispersion strengthened iron-base alloy is co-strengthened by a L21 type Ni2AlMn intermetallic compound and an oxide dispersed phase, so that the strengthening effect is remarkable.

The invention discloses a method of regulating performance of a CoCrFeNiCu high-entropy alloy. The method is characterized by comprising the following steps: smelting raw materials Co, Cr, Fe, Ni andCu in equal molar weight with elements in a crucible by means of a smelting method, and smelting the melt at a high temperature continuously for no less than 10min; stretching a pulse electrode into the melt stopped in heating, and processing the pulse electrode for 30-90s with pulse, the voltage of which is not smaller than 100V and the frequency of which is not smaller than 5Hz, to obtain a CoCrFeNiCu high-entropy alloy; and naturally cooling the CoCrFeNiCu high-entropy alloy to room temperature and taking out a cast ingot from the crucible to obtain a CoCrFeNiCu high-entropy alloy cast ingot. According to the method disclosed by the invention, an electric pulse treatment method is applied to a preparation process of the high-entropy alloy to prepare the high hardness and high strength alloy, the yield strength of which is improved by about 233.3% and the breaking strength of which is improved by about 18.4%; and meanwhile, the invention provides a regulating method which is small inenergy consumption, low in cost, simple to operate or short in treatment period and can regulate the performance of the alloy.