30 results about "ZK60 magnesium alloy" patented technology

The invention provides a magnesium alloy material of high intensity and high yield ratio. The alloy comprises the following components by mass: 5.0-9.0% of Zn; 0.5-1.5% of Mn; 1-10% of Sn; less than 0.15% of inevitable impurities; and the balance magnesium. By means of plastic forming and a choice of reasonable technological conditions for heat treatment after forming, the magnesium alloy material of the invention can be of high intensity and high yield ratio, and is higher than the high-strength wrought magnesium alloy ZK60 in terms of yield strength and tensile strength. With low cost, good extrudability and formability at a low temperature, the magnesium alloy material provided in the invention boasts substantial application potential, thus being able to partly replace the magnesium alloy material ZK60.

The invention discloses a method for reinforcing a ZK60 magnesium alloy by adding Sc, which is realized by adding a rare-earth element Sc into the ZK60 magnesium alloy. The method comprises the following concrete steps of: smelting and ingot making, homogenizing, hot-extruding, heat treatment and the like. Because of the addition of the Sc, crystalline grains of the ZK60 magnesium alloy is effectively refined, intergranular reticular precipitated phases become thin with uniform distribution, and thin and diffused particle-shaped precipitated phases are formed at a crystal boundary, and after the intergranular reticular precipitated phases and thin and diffused particle-shaped precipitated phases are subjected to homogenization, extrusion and heat treatment, the tensile strength of the alloy can reach 364MPa, the yield strength can reach 352MPa and the yield ratio is close to 1. Compared with the common ZK60 alloy, a product in the method has the tensile strength and the yield strength which are respectively improved by 39MPa and 67MPa, and thus, the tensile strength and the yield strength of the ZK60 magnesium alloy are obviously improved and the industrial application range of the ZK60 magnesium alloy is widened.

The invention provides a wrought magnesium alloy containing rare earth cerium and yttrium and having high yield ratio. The alloy comprises the following components in percentage by mass: 4.90-5.20wt.% of Zn, 0.50-0.80wt.% of Zr, 0.50-0.70wt.% of Ce, 0.10-1.50wt.% of Y, less than 0.12wt.% of inevitable impurities and the balance of Mg. A certain amount of cerium and yttrium are added into the ZK60 magnesium alloy to effectively refine grains, and cerium and yttrium as well as magnesium and zinc in the alloy can form fine and dispersed strengthening phases to effectively hinder growth of recrystallized grains in the thermal deformation process and strengthen the matrix, so that the high yield ratio can be obtained, and the yield strength exceeds 300MPa which is remarkably higher than that of the magnesium alloy ZK60. Meanwhile, good plasticity is guaranteed. The material provided by the invention can enhance the reliability of mechanical parts, the product quality is improved and the utilization ratio of the material is improved, so that the using potential of the magnesium alloy material is fully explored.

The invention relates to a preparation method of a biodegradable magnesium alloy/calcium phosphate coating composite material. The preparation method comprises the steps of pre-treating a matrix, preparing a conversion liquid, and preparing a bionic calcium phosphate coating to obtain the biodegradable magnesium alloy/calcium phosphate coating composite material. Compared with the prior art, the preparation method has the advantages that the prepared ZK60 magnesium alloy/calcium phosphate coating composite material can be used for remarkably improving the corrosion resistance of a ZK60 magnesium alloy, greatly reducing the degradation rate of the ZK60 magnesium alloy in a bionic body liquid and promoting the research and application of the ZK60 magnesium alloy in the medical field.

The invention provides an aging strengthening type magnesium alloy and a heat treatment process thereof. The alloy comprises, by weight, 6.8-8.0% of zinc, 0.8-1.5% of copper and 0.8-1.5% of manganese, with the balance being magnesium and inevitable impurities. According to the heat treatment process, an alloy ingot is subjected to two-stage homogenization treatment under the condition of (330-360) DEG C * (4-8)h+(400-420) DEG C * (16-20)h and is subjected to thermal forming at the temperature of 360-400 DEG C, a finished product is subjected to solution treatment at the temperature of 400-430 DEG C for 2-4 hours, and two-stage aging is performed under the condition of (80-100) DEG C * (3-5)h+(175-190) DEG C * (15-18)h after water cooling, so that an aging strengthening effect much better than that of a commercial high-strength ZK60 alloy can be achieved, and alloy strength can be improved obviously. The alloy does not contain heavy metal and is low in cost; the limitation that aging strengthening of conventional commercial magnesium alloys is achieved through MgZn2 phases is broken through; through proper heat treatment process, precipitated phases in the alloy can be precipitated in a small dispersed mode and the ageing strengthening potential of the alloy can be developed to the greatest extent.

The invention discloses a low-cost preparation method of an ultrafine-grained high-strength plastic rare earth magnesium alloy. The low-cost preparation method comprises the steps of alloy smelting, solution treatment and isothermal extrusion, specifically, firstly a ZK60 magnesium alloy containing a rare earth element ytterbium (Yb) with a mass percentage of 0.8-1.5% is smelted according to the composition, then rapidly condensed into an ingot and then subjected to the solution treatment at 400 DEG C for 48 h, and finally the isothermal extrusion is performed at 330-350 DEG C with a strain rate of 0.1-1.0 s<-1> and an extrusion ratio of 10-30 to obtain an ultrafine-grained high-strength plastic magnesium alloy block with an average grain size of less than 1 [mu]m, the tensile strength ofmore than 400 MPa and the elongation of more than 15%. According to the low-cost preparation method of the ultrafine-grained high-strength plastic rare earth magnesium alloy, conventional low extrusion ratio deformation is utilized to obtain an ultrafine-grained structure which is difficult to obtain in a conventional magnesium alloy system, the addition amount of the rare earth element is combined to control the strength and plasticity of the alloy, and finally a magnesium alloy block material which is refined in structure and has high strength and plasticity is obtained. The cost is low, theprocess is short, the efficiency is high, and good industrial application prospects are achieved.

The invention relates to a method for preparing a degradable magnesium alloy and modified polylactic acid coating composite material. The method includes the following steps that a magnesium alloy matrix is polished so that a surface oxidization layer is removed; acid etching pre-treatment and neutralizing treatment are carried out on the magnesium alloy matrix; polylactic acid is dissolved in a chloroform solution and a polylactic acid solution is prepared; the magnesium alloy matrix is immersed in the polylactic acid solution, and the surface of the magnesium alloy matrix is wrapped with a polylactic acid coating in a solution immersing and coating method; the obtained magnesium alloy material wrapped with the polylactic acid is stored for 2-3 days in a ventilated place, so that chloroform in the polylactic acid solution is volatilized completely, and the degradable magnesium alloy and modified polylactic acid coating composite material is obtained. Compared with the prior art, the anti-corrosion performance of ZK60 magnesium alloy can be improved obviously through the obtained magnesium alloy and modified polylactic acid coating composite material, the degradation rate of the ZK60 magnesium alloy in an organism can be greatly reduced, and researching and application of the ZK60 magnesium alloy in the medical field are promoted.

The invention discloses a corrosion-resistant high-performance wrought magnesium alloy and a preparation method thereof. The preparation method comprises the steps of alloy smelting, solid solution and hot extrusion. Firstly, a ZK60 magnesium alloy containing a rare earth element ytterbium (Yb) with the mass percent of 1.8% to 2.1% is smelted according to ingredients, then solid solution treatmentis carried out on the ZK60 magnesium alloy for 450 DEG C*24 h in protection gas, and hot extrusion is carried out at the temperature of 250 DEG C to 320 DEG C with the strain rate of 0.005 s<-1> to 0.01 s<-1> and the extrusion ratio of 32-40. The tensile strength of the finally obtained ZK60 alloy is 400-450 MPa, the ductility ranges from 10% to 20%, and compared with a commercialized ZK60 alloy,the corrosion current density can be reduced by 1-2 magnitudes orders. According to the corrosion-resistant high-performance wrought magnesium alloy and the preparation method thereof, a wrought magnesium alloy material prepared through a conventional process is utilized, high strength and high plasticity are achieved, excellent corrosion resistance is achieved, and the corrosion-resistant high-performance wrought magnesium alloy can be adopted as a ideal alternative to aerospace, weapon, 3C and biomedical materials.

The invention relates to an anticorrosion magnesium alloy, belonging to the field of metal materials. The magnesium alloy comprises the following components by mass: 0.3-3% of Cd, not more than 0.02% of Fe, not more than 0.002% of Cu, not more than 0.01% of Si, not more than 0.002% of Ni and the balance of magnesium, wherein Fe, Cu, Si and Ni are impurity elements. The alloy has the following beneficial effects: the element cadmium is added to the alloy, thus obviously lowering the cost of the alloy and avoiding the rare earth resources from being wasted; and the mechanical performance and the anticorrosion performance of the alloy are superior to the mechanical performance and the anticorrosion performance of pure magnesium, thus solving the problems of easy combustion, poor room temperature plasticity, lower mechanical performance, incapability of being against corrosion and the like during smelting in the prior art.

The invention discloses a ZK60 magnesium alloy heat treatment process and a performance study thereof, and belongs to the field of magnesium alloy machining. The ZK60 magnesium alloy heat treatment process studies the heat treatment process of a high-strength deformed magnesium alloy ZK60 and the influence of the heat treatment process on the structure and performance of the alloy from a heat treatment method combining solid solution treatment with aging treatment. The optimal solid solution treatment process of the ZK60 magnesium alloy is that thermal insulation is performed at 500 DEG C for3 hours, and the optimal aging treatment process is that thermal insulation is performed at 180 DEG C for 12 hours. The ZK60 magnesium alloy heat treatment process has the advantages that the development of the magnesium alloy gets rid of the current situation that a cast magnesium alloy is the main component for a long time, the application of the deformed magnesium alloy in industrial products is increased, the industrialization process of the magnesium alloy is promoted, and the rapid development of the whole deformed magnesium alloy field is promoted.

The invention relates to a novel flux for ZK60 magnesium alloy, and a preparation method and a usage method thereof, and belongs to the smelting field. The novel flux is characterized by comprising the following raw materials, by weight: 30-40% of MgCl2, 35-45% of KCl, 5-8% of CaF2, 2-5% of CaCl2, 18-20% of BaCl2, and 4-5% of ZrCl4. The novel flux provided by the invention enables the yield of the Zr element in the magnesium alloy increases to 70-75%, so as to effectively control smelting cost and save the zirconium resource, and has a breakthrough significance in the research of the field.

The invention provides a preparation method of a strong-plasticity magnesium alloy. The method comprises the following steps of rolling a solid solution magnesium alloy to obtain a rolled magnesium alloy; and carrying out ultrasonic surface rolling processing on the rolled magnesium alloy to obtain the strong-plasticity magnesium alloy. According to the method, material grains are refined by rolling the solid solution magnesium alloy, so that the magnesium alloy reaches a good state in the mechanical property, then the rolled magnesium alloy is further subjected to surface modification throughultrasonic surface rolling processing (USRP), and a gradient nanostructure is prepared in the alloy; and rapid reduction of plasticity of the material when the strength is improved is delayed, so that the magnesium alloy has excellent strength and plasticity. Experimental results show that the product of strength and elongation of the prepared ZK60 magnesium alloy is increased from 4106.7 MPa.% to 5313.2 MPa.%; and the product of strength and elongation of the prepared AZ31 magnesium alloy is increased to 1854 MPa.% from 1408 MPa.%.

In order to solve the technical problems that an existing ZK60 magnesium alloy preparation method is uneven in structure and poor in compactness, the invention provides a ZK60 magnesium alloy preparation method based on the SPS technology. The method comprises the following steps that S1, ZK60 magnesium alloy powder is poured into a stainless steel ball milling tank, and absolute ethyl alcohol is added for ball milling; S2, vacuum drying is conducted on powder obtained after ball grinding; and S3, the powder obtained after vacuum drying is placed in a grinding tool and sintered in discharge plasma sintering equipment, and a sintered ZK60 magnesium alloy material is obtained. Compared with a traditional method for conducting sintering by using a vacuum hot-pressing sintering furnace, the method has the advantages that the sintering period of raw materials is greatly shortened and the environmental protection is improved while better strength and plasticity are ensured. The preparation method is simple, good in safety and high in economic value, and has a great popularization space.

The invention discloses a ZK6IM wrought magnesium alloy casting technology. According to the ZK6IM wrought magnesium alloy casting technology, Zr is controlled at medium upper limit, and w(Zr) is 0.6-0.8%; Zn is controlled at lower limit, and (Zn) is 5.3%-5.5%; ZK61Mmagnesium alloy melts are prevented from being over hot, and the casting speed is controlled within 36mm/min-40mm/min; the casting temperature is low as much as possible and is controlled in a range of 6950-7050 DEG C; an original crystallizer is improved, the secondary water cooling strength is reduced under the condition that primary cooling strength is not changed, and the tensile stress is reduced; and during homogenization treatment on cast ingots, the cast ingots stay in an environment at the temperature of 3900 DEG C for 12 hours. The ZK6IM wrought magnesium alloy casting technology has the advantages that the microsegregation force is eliminated, the hardness is greatly reduced, and the machining and forming property is improved effectively.

The invention provides a magnesium-based composite material and a preparation method thereof. An Al18B4O33 whisker preform is mixed into a ZK60 magnesium alloy matrix, reaction conditions are controlled to enable the Al18B4O33 whisker preform to grow in situ in the ZK60 magnesium alloy matrix to form an Al18B4O33 whisker, the Al18B4O33 whisker is uniformly distributed in the ZK60 magnesium alloy, the defect of poor mechanical property of the magnesium alloy is overcome, and the obtained magnesium-based composite material is high in hardness and good in wear resistance.

The invention relates to a method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation. The method comprises the specific steps that S1, abrasive paper is used forpolishing the surface of a ZK60 magnesium alloy product; S2, the polished magnesium alloy product is placed into an ethanol solution to be subjected to ultrasonic cleaning and drying; S3, a preparedsolution is poured into an electrolytic cell; S4, the magnesium alloy product is fixed to a support through a stainless steel wire to be soaked into an electrolyte; S5, a micro-arc oxidation power source is started, working parameters with the positive voltage being 250 V, the negative voltage being 20 V, the working frequency being 600 Hz, the positive vacuum ratio being 30%, the negative duty ratio being 70% and the positive and negative pulse number being 1 are used for conducting micro-arc oxidation processing on the magnesium alloy product for 15 min; and S6, absorbent paper is used for drying, and natural drying is then carried out after the magnesium alloy product is subjected to deionized water ultrasonic cleaning. By means of the method, toxic substances are not contained, and themethod is environment-friendly and convenient, and the prepared micro-arc oxidation magnesium alloy product has the good corrosion resistance.

The invention discloses a ZK61M magnesium alloy for aerospace. The ZK61M magnesium alloy for aerospace is prepared by the following steps of (1) performing forging. specifically, a ZK61M round ingot conforming to the standard of a YS/T 627-2013 wrought magnesium and magnesium alloy round ingot is heated and forged, and is subjected to the forging in the three directions of length, width and height; (2) performing hot rolling, specifically, a forged sheet obtained in the step (1) is subjected to steer rolling, and then to the small machining rate multi-pass rolling at a temperature of 345-355 DEG C, so that a hot-rolled sheet with a total power of 26-27% is finally obtained; and (3) performing aging. specifically, the hot-rolled sheet obtained in the step (2) is subjected to aging treatmentat 170-180 DEG C for 22-26 hours to obtain the ZK61M magnesium alloy for aerospace. According to the ZK61M magnesium alloy for aerospace obtained by forging, hot rolling and aging treatment, the magnesium alloy three-way performance exceeds the requirement for aerospace materials, and the ZK61M magnesium alloy can be well applied to the aerospace military industry.