31results about How to "Improve compression plasticity" patented technology

The invention discloses a method for preparing a flexible bulk metallic glass, comprising the following steps: step 1, putting each raw material into a dry smelting device according to the alloy composition of the bulk metallic glass; in the presence of a protective gas, Prepare master alloy ingots after repeated smelting of each raw material; step 2, purify the master alloy ingot obtained in step 1 by using oxides as a purification medium; step 3, heat the quartz to a molten state to prepare a quartz mold; step 4 After sealing the quartz mold, place the purified master alloy ingot in the quartz mold, heat the master alloy ingot to melt in the presence of protective gas, press the molten metal into the quartz mold by air pressure, and make The molten metal is homogeneous and filled with the quartz mold, then taken out and immediately quenched in cold water, resulting in a flexible bulk metallic glass. The invention greatly improves the compressive plasticity of the bulk metallic glass, so that the metallic glass can flexibly bend without breaking at room temperature.

The invention discloses a W-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound, the composition range of which is 33at% Ni, 30at% Cr, 4at% Mo, 1-15at% W and The balance of Al. In the composition range near the eutectic point of NiAl-Cr(Mo) double-phase eutectic, reduce the content of Al element, add W element for modification, and W element and NiAl form a pseudo-binary eutectic phase, plasticity at room temperature On the basis of Ni-rich NiAl-Cr(Mo) two-phase structure with good toughness, the introduction of appropriate W phase can further improve the high temperature strength and room temperature plasticity of eutectic intermetallic compounds. The density of the W-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound of the invention is 6.8-7.8 g / cm3, and the yield strength at 1150 DEG C is 110-200 MPa.

A regulation Ti 48 Zr 20 Nb 12 Cu 5 be 15 The method for the thermal stability of the amorphous composite material is to realize the adjustment and control of the thermal stability of the Ti48Zr20Nb12Cu5Be15 amorphous composite material through low-temperature cold treatment. Ti 48 Zr 20 Nb 12 Cu 5 be 15 Put the sample of amorphous composite material into the cold treatment device, put the cold treatment device into the liquid nitrogen tank, so that the liquid nitrogen completely immerses the Ti in the quartz glass tube. 48 Zr 20 Nb 12 Cu 5 be 15 For amorphous composite samples, start timing when the thermometer reading reaches 77K, soak for 1 minute to 1 week, take it out and let it stand at room temperature. The present invention improves Ti 48 Zr 20 Nb 12 Cu 5 be 15 In addition to the thermal stability and aging resistance of amorphous composite materials, it also provides low-temperature atomic relaxation conditions to transform the amorphous state from one metastable state to another metastable state with lower energy, improving its compressive plasticity and making it It has more excellent comprehensive mechanical properties.

The invention discloses a preparation method of Ti2448 biomedical alloy with low Young's modulus. The preparation process includes the following steps: mixing Ti, Nb, Zr and Sn simple substances according to the mass fraction, performing electric arc melting, and rolling the cast ingot by adopting three different rolling process parameters. In order to eliminate internal stress, the plate is subjected to solution treatment at 850°C and water quenched, and then the Young's modulus of the alloy is reduced by adding appropriate pre-strain. Compared with the prior art, the present invention successfully reduces the Young's modulus of the Ti2448 alloy to 33GPa and optimizes the comprehensive mechanical properties of the alloy through appropriate thermomechanical treatment parameters and adding appropriate pre-strain.

A preparation method of high-strength and long-life porous nickel-based solid solution for electrolytic hydrogen production, using powder metallurgy microwave sintering method, using Mg powder as a pore-forming agent, and passing ultrafine Fe, Co, Ni powder and Mg powder with different content ratios After ball milling, press molding, and high temperature (>700°C) microwave sintering to make porous nickel-based solid solution. The porous nickel-based solid solution of the present invention has the advantages of three-dimensional open pore structure, high permeability, high strength, large specific surface area, excellent electrical conductivity, etc., and can form high catalytic The multi-component composite oxide active site with high performance is suitable for oxygen evolution electrode for hydrogen production by water electrolysis.

The invention discloses a Ti-based block amorphous alloy with a great amorphous forming ability and a preparation method thereof. The composition of the Ti-based block amorphous alloy is shown as the following general formula: (Ti66-xZrxBe34-yFey)100-zCuz, wherein, x, y and z are atomic percentage (*100), and have the value ranges that: x is greater than or equal to 20 and smaller than or equal to 26, y is greater than 0 and smaller than or equal to 12, and z is greater than or equal to 0 and smaller than or equal to 12. The preparation method of the Ti-based block amorphous alloy consists ofthe steps of: converting the atomic percent of the components in the Ti-based block amorphous alloy into mass percent, and weighing out raw materials; mixing and melting the raw materials under vacuum or gas protection and making a master alloy ingot; melting the master alloy ingot which is then put into an oxygen-free copper die through suction casting or spray casting, thus obtaining the Ti-based block amorphous alloy. The preparation method of the invention can prepare Ti-based block amorphous alloys with a good amorphous forming ability and a low density at a low cost.

The invention discloses a preparation method of an alpha+alpha' phase-containing beta-phase Ti2448 biomedical alloy single crystal and the single crystal, wherein the preparation method comprises thesteps: S1, pressing prepared alloy powder into material rods by using a hydrostatic pressure method, and sintering the material rods into polycrystalline rods; and S2, fixing the polycrystalline rod to each of the upper end and the lower end of a ultra-high-temperature optical floating zone furnace, and enabling the other ends of the two rods to be close to each other in a heating zone; sealing afurnace, simultaneously rotating the two rods in the same direction or opposite directions, quickly heating to melt two end points, controlling the rotating speed to stably melt, and butting to form astable melting area; and then moving the heating area for crystal growth, powering off and naturally cooling to room temperature after the crystal growth is finished, and taking out the Ti2448 singlecrystal rod. Compared with the prior art, the method has the advantages that the crystal growth process is simple, the repeatability is high, the single crystal grown by using the optical floating zone method is free of macroscopic defects and has the diameter of centimeter level, the strength and plasticity of the Ti2448 biomedical alloy single crystal material are greatly improved, and the lowelastic modulus is maintained.

The invention discloses a light Ti35Y35Sc20V5Al5 high-entropy alloy and a preparation method thereof, and belongs to the technical field of light high-entropy alloy material. A vacuum arc is used forsmelting. An INSTRON mechanical experiment machine and a Hopkinson pressure bar are used for respectively conducting a quasi-static compression test with strain rate of 1*10<-3>s<-1> and a dynamic compression test with strain rate of 1500 s<-1>. The crystal structure is analyzed by X-ray diffraction. Composition and distribution of a phase are determined by energy spectrum analysis. A scanning electron microscopy is used for observing the microstructure of a specimen at the fracture surface, and the fracture model is the brittle fracture mode. The high-entropy alloy is a high-entropy solid solution phase with dense hexagonal structure. Under the condition of high strain rate, the yield strength and plasticity of the material are improved. The material exhibits excellent impact toughness.

The invention belongs to the technical field of metal materials, and discloses an amorphous composite material with phase transition modulated by oxygen and a preparation method thereof. The main chemical composition of the composite material is Ti a Zr b Ni c Cu d be e o f , where a, b, c, d, e and f are the atomic percentages of the corresponding elements, 31≤a≤63, 26≤b≤40, 0.1≤c≤6, 1≤d≤10, 1≤e≤22, 0.1≤f≤6, and a+b+c+d+e+f=100; the material is a type of amorphous composite material with deformation-induced martensitic transformation. The method is mainly to add the oxide of metal M to the alloy during smelting to realize the addition of O element, and M is one or more of Ti, Zr and Cu. The addition of O element can effectively modulate the dynamic characteristics and distribution of deformation-induced martensitic transformation, so that the amorphous composite material exhibits excellent comprehensive mechanical properties such as high strength, large plasticity and good work hardening ability. The invention has important guiding significance for the industrial production and practical application of the amorphous alloy and its composite material.

The invention provides a method and a system for improving the compression plasticity of amorphous alloy. The method for improving the compression plasticity of the amorphous alloy comprises the following steps of: cutting an amorphous alloy material to be in a shape of which the height-diameter ratio is larger than 0 and smaller than 1; and compressing the amorphous alloy material along the height direction so that the plastic distortion of the amorphous alloy material along the height direction reaches 5 percent to 50 percent. The method and the system for improving the compression plasticity of the amorphous alloy can improve the plastic distortion capability of the amorphous alloy material, lead the amorphous alloy material to also have larger compression plasticity at the standard height-diameter ratio, and are simpler to realize without complicated process.