30results about How to "Increased yield strength at room temperature" patented technology

The invention belongs to the field of nano-structured metal materials, and specifically related to an (111) texture nano-grade twin crystal Cu block material and a preparation method thereof. The microstructure of the material is composed of columnar crystal grains with sizes of 1-50 micrometers. High-density nano-grade twin crystal lamellar structures are uniformly distributed in the crystal grains. The thicknesses of the twin crystal lamellar structures are 30 nanometers to hundreds of nanometers. The structural characteristics of the material are that: the materials have an (111) texture, columnar crystal grains, and low-angle boundaries; the nano-grade twin crystal lamellar structures and sigma3 coherent twin crystal interfaces are perpendicular to a growth direction; the grain sizes and twin crystal lamellar structures can grow under control; and the strength of the blocks can reach 10 times that of macro-crystal Cu. According to the invention, a direct current electrodeposition technology is adopted, and the technological conditions are slightly changed, wherein an appropriate plating bath composition and appropriate deposition parameters are controlled. According to the invention, performance problems of Cu materials in prior arts can be solved, and a Cu material with excellent performance, high strength, high thermal stability, high conductivity and high plasticity can be obtained.

A nano-class twin-crystal copper material with ultrahigh strength and ultrahigh electric conductivity is prepared by electrolytic deposition technique. The resultant high-purity polycrystal copper material features that its microstructure is composed of nearly equiaxed submicron (300-1000 nm) crystals, and in the crystal there are high-density parallel twin crystal layers with different orientations. Its advantages are high yield strength up to 900 MPa and break strength up to 1086 MPa, and high electric conductivity (1.75+ / - 0.02 X to the power -8 ohm.m).

The invention relates to the technical field of metal materials and processing thereof, and discloses a high-strength plastic aluminum alloy and a preparation method thereof. The composition content of the aluminum alloy is as follows: the mass fraction of Cu is 5%-6%, and the mass fraction of Mg is 0.2%- 1.0%, the mass fraction of Ag is 0.2-0.5%, the mass fraction of Mn is 0.2-0.4%, and the mass fraction of alloy elements is ≤10%, and the balance is Al. By reasonably controlling the contents of Cu, Mg, Ag and Mn in the aluminum alloy, the aluminum alloy has both high strength and high plasticity. The preparation method: 1. melting and casting to obtain an aluminum alloy ingot; 2. homogenizing treatment; 3. extruding and deforming to obtain a high-strength and tough aluminum alloy. Its deformed mechanical properties such as strength, plasticity and toughness are superior to the traditional commercial deformed aluminum alloy 2D70, and its comprehensive mechanical properties in the as-cast state are superior to the traditional commercial cast aluminum alloy 2024, which is suitable for aerospace materials.

The invention belongs to the technical field of nonferrous metal material processing and particularly relates to a heat treatment method of transformation zinc-aluminum-vanadium alloy. According to the heat treatment method of the transformation zinc-aluminum-vanadium alloy, multi-pass repeated heat treatment containing splat cooling circular quenching is adopted, and in other words, when heat preservation is conducted on a zinc-aluminum-vanadium alloy semi-finished product obtained after hot and cold plastic working for 0.5-2.0 hours at the temperature of 100-190 DEG C, the zinc-aluminum-vanadium alloy semi-finished product is delivered out of a furnace for splat cooling quenching; then, the zinc-aluminum-vanadium alloy semi-finished product is reheated to 100-190 DEG C, heat preservationis conducted for 0.5-2.0 hours, and the zinc-aluminum-vanadium alloy semi-finished product is delivered out of the furnace for splat cooling quenching; and heat treatment is repeated by two or more cycles as above. The tensile strength, achieved at the room temperature, of the zinc-aluminum-vanadium alloy obtained after the special heat treatment mode exceeds 402 MPa; and the percentage elongation after fracture reaches 10% or above. Compared with a common heat treatment method, by means of the heat treatment method, the tensile strength of the zinc-aluminum-vanadium alloy is improved by 60%or above, and good plasticity is maintained. Therefore, the heat treatment method can achieve the quite good engineering value.

The invention provides a rare earth-free low-alloy super-high-toughness magnesium alloy and a preparation method thereof, relates to the fields of metal materials and metal material processing, and particularly relates to a magnesium alloy and a preparation method thereof. The invention aims to solve the problem of low yield strength of the existing magnesium alloy, and to provide a rare earth-free low-alloy super-high-toughness magnesium alloy and a preparation method thereof. The low-alloy super-high-toughness magnesium alloy is prepared from Mg and alloying elements, wherein the mass fraction of the alloying elements is equal to or less than 2.5%, and the balance of Mg; the alloying elements are composed of Al, Ca and Mn, or Al, Ca, Sr and Mn. The preparation method comprises the following steps: 1, smelting and casting to obtain a cast alloy; 2, performing homogenization treatment; 3, performing extrusion deformation to obtain the rare earth-free low-alloy super-high-toughness magnesium alloy. The advantages are as follows: the yield strength at the room temperature reaches up to 334 to 430 MPa, the tensile strength reaches 356 to 440 MPa, and the ductility is 5.0% or above. The preparation method provided by the invention is mainly used for preparing the rare earth-free low-alloy super-high-toughness magnesium alloy.

The invention provides a heat treatment process for simultaneously improving the strength and the plasticity of a magnesium alloy, comprising the following steps of: carrying out solid solution on a magnesium alloy casting ingot prepared by utilizing a semicontinuous casting process at 360-4,000 DEG C, preserving the temperature for 8-12h, carrying out water quenching and cooling to room temperature, then heating the magnesium alloy treated by the technical scheme to 150-2,000 DEG C, ageing, preserving the temperature for 15-30h, and air-cooling to the room temperature. The heat treatment process of the invention can remarkably improve the room temperature yield strength, the tensile strength and the plasticity of the magnesium alloy material and can solve the contradiction of the strength and the plasticity of the magnesium alloy. The magnesium alloy treated by the heat treatment process can provide an important basis for the subsequent high-strength and high-plasticity deformed magnesium alloy and benefits to the full development of the use performance potential of the material. In addition, the invention has the advantages of simple equipment and lower cost and is easy to operate.

The invention is applicable to the technical field of titanium alloys, and provides a nano particle reinforced ZTC4 titanium alloy and a preparation method thereof. The reinforced nano particles are nano TiC particles, which can be used to improve the strength of the ZTC4 titanium alloy. Specifically, the ZTC4 titanium alloy includes the following components in terms of mass percentage: Al 5.5% to 6.8%, V 3.5% to 4.5%, Ti 88.4% to 90.99%, nano TiC particles 0.01% to 0.3%, and the balance is impurities Elements, the sum of the mass percentages of each component is 100%. In the present invention, by adding nano TiC particles in the ZTC4 titanium alloy, the strength of the ZTC4 titanium alloy is significantly improved unexpectedly, and can ensure that the elongation of the ZTC4 titanium alloy does not change greatly, which is very important for realizing the ZTC4 titanium alloy in the ZTC4 titanium alloy. Applications in high-strength environments are of great significance.

The invention is applicable to the technical field of titanium alloys, and provides a nano-particle toughened ZTC4 titanium alloy and a preparation method thereof. The toughened nano-particles include nano-TiC and nano-TiB 2 , and nano-TiC and nano-TiB 2 The molar ratio is 1:(1~3). The casting alloy comprises the following components: 5.5%-6.8% of Al, 3.5%-4.5% of V, 88.4%-90.99% of Ti, and 0.01%-0.3% of strengthening and toughening nanoparticles. The present invention adds toughening nano-TiC and nano-TiB 2 The particles obtained unexpected effects: with and without adding nano-TiC and nano-TiB 2 Compared with the ZTC4 titanium alloy with particles, the tensile strength, yield strength and elongation of the ZTC4 titanium alloy added with nanoparticles are all improved at the same time, especially the elongation is significantly improved, which has great significance for the application of ZTC4 titanium alloy in complex environments. Great significance.

The invention discloses an optimization method for hydrogenated TC4 titanium alloy forging technology parameters. The optimization method is used for solving the technical problem that the practicability of a hydrogenated titanium alloy forging technology in the prior art is poor. According to the technical scheme, the optimization method comprises the steps that the flow stress and the strain data of hydrogenated TC4 titanium alloy are obtained through a thermal simulation compressive deformation experiment firstly, and then the value of the strain rate sensitivity index m, the value of the energy dissipation rate eta and the value of the flow instability parameter epsilon are calculated; and the reasonable strain rate range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the energy dissipation rate eta, then, the reasonable forging temperature range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the flow instability parameter epsilon, and the reasonable forging temperature and the reasonable strain rate of the hydrogenated TC4 titanium alloy are optimized out. By means of the optimization method for the hydrogenated TC4 titanium alloy forging technology parameters, a TC4 titanium alloy blade with the hydrogen content being 0.4 wt% is forged successfully; compared with the national standards of a TC4 titanium alloy forging blade, the tensile strength at room temperature, the yield strength at the room temperature and the tensile strength at the high temperature of 400 DEG C of the TC4 titanium alloy blade with the hydrogen content being 0.4 wt% are all improved.

The invention relates to an iron-based bulk metallic glass alloy with a large supercooled liquid phase region and belongs to the technical field of novel materials. The iron-based bulk metallic glass alloy with the large supercooled liquid phase region is characterized by consisting of iron, nickel, cobalt, molybdenum, chromium, tungsten, phosphorus, carbon, boron and silicon and having a composition expression of FexNiyCozMoaCrbWcPdCeBfSig, wherein x, y, z, a, b, c, d, e, f and g respectively represent atom percent content of each corresponding component; x is 50 to 70 percent; y is 0 to 20 percent; z is 0 to 15 percent; a is 2 to 6 percent; b is 0 to 4 percent; c is 0 to 3 percent; d is 8 to 15 percent; e is 10 to 12 percent; f is 2 to 6 percent; g is 0 to 2 percent; x+y+z is 50 to 75 percent; a+b+c is 4 to 10 percent; and x+y+z+a+b+c+d+e+f+g is equal to 100 percent. The alloy has the typical composition expression of Fe55Co10Ni5Mo5P10C10B5. The iron-based bulk metallic glass alloy has the effects and the benefits that the alloy simultaneously has the advantages of low glass transition temperature, large supercooled liquid phase interval, high glass-forming ability, low coercive force, excellent mechanical performance, low viscosity coefficient in a cold liquid phase interval and the like, can implement micron-grade and nano-grade superplasticity processing, and is a novel iron-based soft magnetic metallic glass alloy for superplasticity processing, with low production cost.

The invention relates to high-Cr-content cast heading machine cutter steel. The cutter steel comprises the chemical components of, by weight, 0.30%-0.55% of C, 8.0%-12.0% of Cr, 1.2%-3.0% of Mo, 0.5%-1.8% of Ni, 0.6%-1.0% of V, 0.1%-0.4% of Mn, 0.6%-0.8% of Si, 0.04%-0.30% of N, no more than 0.005% of S, no more than 0.03% of P and the balance Fe. The cutter steel manufacturing technique comprisesthe following steps that a near-net shape blank of a cutter is obtained through precise casting, then heat treatment is conducted, and a finished product is obtained directly after fine machining. Yield strength and tensile strength are improved while the hardness, impact toughness and elongation of the cutter steel all can reach the level of domestic forged heading machine cutter steel; the oxidation corrosion resistant capability, thermal fatigue resistant performance and abrasive grain abrasion resistance are improved; and the production period is shortened, and the production cost is reduced.