In this paper, the research results of additive manufacturing titanium alloy in recent years are reviewed, and the research process at home and abroad is summarized from two aspects: the study of microstructure and properties, the influence of different methods on microstructure and properties, and the next research is prospected.

This paper reviews the development history of Chinese aluminum industry, classifies and summarizes the waste aluminum alloy, analyzes the social quantity of domestic waste aluminum alloy resources from multiple angles, and predicts the increment of waste aluminum alloy (recycled aluminum) resources in the next ten years (2026-2035). The problems existing in the development of domestic waste aluminum alloy recycling industry and how to achieve benign development in the future are put forward.

This paper introduces the common classification of the melting&holding furnace, and some auxiliary facilities closely matched with the melting&holding furnace. By introducing some new combustion technology in the melting&holding furnace, the development direction of the melting&holding furnace is introduced. This paper describes the related technology of the furnace systematically, and points out that the furnace development direction of the furnace is reducing burning loss, saving energy, safety and environmental protection and intelligence.

The paper analyzes the digital delivery of engineering design of nonferrous metal processing industry from the aspects of construction background, development status, construction ideas, project application cases and existing difficult problems, and puts forward solutions.

In this paper, the liquid-solid cast-rolling 1070A/2024 aluminum alloy composite sheet with casting and rolling speeds of 14 m/min, 12 m/min, 10 m/min and 8 m/min are prepared by vertical double-roll casting and rolling mechanism. By means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), hardness tester and shear test, the effect of casting and rolling speed on the interface microstructure and properties of liquid solid casting and rolling 1070A/2024 aluminum alloy composite sheet is investigated. The results show that with the decrease of the casting and rolling speed, the intermetallic compounds at the composite interface first increase and then decrease, and the interfacial hardness at the composite interface increases and then decreases, reaching the highest value of 129.5HV0.1 when the casting and rolling speed is 10 m/min. The shear strength changes in a wavy way and reaches a maximum value of 80.7 MPa when the roll speed is 12 m/min.

This paper expounds the harm and potential value of aluminum ash, introduces the comprehensive utilization technology of aluminum ash resources, and analyzes the application prospect and existing problems of aluminum ash.

Abstract: Starting from the actual needs of digital transformation of nonferrous metal processing enterprises, this paper discusses the overall framework of nonferrous metal processing digital factory with industrial internet platform as a unified base. From the four aspects of equipment automation, production digitization, operation digitization, data security protection to carry our research, put forward the construction of nonferrous metal processing digital factory ideas, enabling nonferrous metal processing enterprises to improve production efficiency, optimize product quality, enhance equipment operation guarantee, reduce production energy consumption, strengthen safety production, improve competitiveness.

In this paper, the latest research progress of friction stir welding of aluminum alloy is summarized. This paper reviews the latest research results at home and abroad in recent years from three aspects: welding simulation research, the influence of welding parameters on weld microstructure and properties and the research on friction stir welding properties of aluminum alloy. Finally, it is pointed out that friction stir welding of dissimilar aluminum alloys is the focus and direction of the next research.

In this paper, titanium aluminum composite plate made by warm rolling process is selected, and then annealed at different times. Optical microscope, scanning electron microscope and tensile property test are used to study the influence of annealing time on the tensile property of titanium aluminum composite plate. The results show that the grain boundary of the conded layer of the processed titanium-aluminum composite plate is relatively straight and complete, and no obvious diffusion phenomenon is observed. The pure titanium layer presents a mixed structure of equiaxed crsytal and twin crystal, while the pure aluminum layer has a completely broken grain and elongated ribbon structure. Compared with the processed state, it is found that the plasticity of the composite plate is significantly improved after annealing, but the strength is somewhat reduced. The tensile fracture of the composite plate is mainly composed of dimple, which has obvious ductile fracture characteristics. According to the analysis, this is caused by the removal of residual stress caused by annealing during the plastic processing of the composite plate.

In this paper, NH4HF2 is used as pickling agent and H2TiF6/H2ZrF6 as passivation agent, the pickling/ TiZr passivation treatment process of 5182 aluminum alloy surface is analyzed through orthogonal test and the content of Ti and Zr elements on the substrate surface. The results show that the optimum parameters of pickling passivation process are as follows: pickling F-concentration is 400ppm, passivation solution pH is 4.1, treatment time is 4.2 s, conductivity is 2 300 μs/cm; the contents of Ti and Zr are 5.48 mg/m2 and 4.79 mg/m2, respectively.

Based on the analysis of the current situation of aluminum strip foil industry in domestic and overseas, this paper analyzes the development trend of aluminum strip foil industry from four aspects of production specialization, intelligence, green and scale.

In this paper, the microstructure of C19210 (Cu-0.1Fe-0.03P) alloy annealed at different temperatures is observed, and its tensile strength, microhardness and electrical conductivity are measured. The result show that the recovery and recrystallization of rolled C19210 alloy occur in sequence at 200~500 ℃. The tensile strength of C19210 alloy decreases when the annealing temperature increases, but the tensile strength increases slightly to 416MPa at 450℃ under the combined effects of work hardening weakening, dispersion strengthening and grain size evolution. The elongation and conductivity of C19210 alloy increase with the increase of annealing temperature, and the microhardness decreases. However, due to the second phase precipitation, the hardness increases to 128HV at 400℃ and then decreases rapidly.

Abstract: Based on the perspective of market supply dependence on demand, using existing and future capacity data, this paper analyzes the layout of lithium battery manufacturers plants and aluminum foil production enterprises in various provinces and cities across the country. The results show that the gap of battery aluminum foil in China is 543.6kt, Sichuan, Ningxia and other provinces completely rely on imports, and Guangdong, Chongqing and other provinces oversupply. For the new battery aluminum foil project, the best regional layout is given, and the development suggestions are provided to the existing enterprises.

In this paper, the dynamic compression experiment of TC21 titanium alloy is carried out by using the separated Split Hopkinson Pressure Bar. The dynamic mechanical properties of TC21 titanium alloy are analyzed and the microstructure after dynamic compression is observed. The evolution of adiabatic shear band (ASB) is studied with emphasis. The results show that: In the process of dynamic compression of TC21 titanium alloy, with the increase of strain rate, the plastic deformation stage can absorb more energy, and microvoids and microcracks formed and expanded along the ASB, finally formed cracks, resulting in shear failure. The deformation process of TC21 titanium alloy during dynamic compression is mainly in the form of sliding, so the whole phenomenon of hardening is displayed in the true stress- true strain curve. The ASB of TC21 titanium alloy shows an obvious white bright band on the macro level, and has an obvious linear structure on the micro level.

The effects of Zr and homogenizing heat treatment on the microstructure and properties of 5083 aluminum alloy cast-rolled plate are studied by means of OM, SEM and hardness test at room temperature. The results show that Zr and Al elements combine to form rod-like Al₃Zr phases interspersed at the grain boundaries can effectively inhibit the recrystallization of tissues. After homogenization at 470℃/14 h, the plasticity of the cast rolled sheet is the best, and the hardness, tensile strength, yield strength and elongation of the edge and core of the cast rolled sheet are 72.82HV0.1 and 63.15HV0.1, 100.13 MPa, 82.27 MPa and 16.92%, respectively.

This paper introduces the principle of horizontal continuous casting of aluminum alloy, summarizes the research status of horizontal continuous casting technology of aluminum alloy, including the application of electromagnetic field technology, HCCM technology, ultrasonic technology and metamorphic treatment technology in casting molding, and the current research status of the technological parameters of horizontal continuous casting of aluminum alloy. The thinning mechanism of electromagnetic field in the solidification process of aluminum alloy is emphasized. Finally, the development direction of aluminum alloy horizontal casting is prospected.

In order to solve the problem of environmental pollution caused by a large amount of flue gas in cold rolling process, the physical models of annular suction hood and slit hood for oil mist trapping in aluminum rolling process are established. The numerical calculation model of the flow field of two kinds of exhaust hoods is established by means of computational fluid dynamics method, and the characteristic wind speed near the mouth of the two kinds of exhaust hoods and the trapping effect of pollutants are compared. The results show that the trap performance of annular suction hood is better than that of slit hood.

In view of the problems such as leakage and rupture caused by erosion wear and corrosion, the influence of bending angle, curvature radius, fluid velocity, particle size and mass flow on the maximum erosion rate of titanium alloy elbow pipe are analyzed by finite element simulation software in this paper. The simulation results show that the area prone to erosion wear is mainly distributed in the outer area of the inner wall of the elbow, and with the increase of the bending angle, the position of the area prone to erosion is gradually closer to the outlet. The maximum erosion rate decreases with the increase of curvature redius, the change of maximum erosion rate is more sensitive to the velocity of low velocity fluid. The influence of particle size on the maximum erosion rate is determined by both the quality of sand and the quantity of sand, and the change of particle size does not change the location of the erosion-prone region. The maximum erosion rate increases with the increase of mass flow rate, and eventually tends to be flat. Finally, from the perspective of bionics, using the natural desert red willow bark as the bionic prototype, the structure of the erosion-prone parts is optimized to extend the service life of the titanium alloy elbow pipe.

In order to observe the effects of different solution heating rates on the microstructure and mechanical properties of 7020 aluminum alloy, DTA, optical microscope and tensile test are used in this paper. The results show that different solution heating rates have little effect on the grain size of 7020 aluminum alloy, but when the solution rate is 250 ℃/h, there is a small amount of linear phase in the matrix besides the granular phase, and the mechanical properties of the alloy after aging treatment are the lowest. After solid solution at a heating rate of 100 ℃/h and aging at 140 ℃×16 h, the T6 state tensile strength, yield strength, and elongation are 327.2 MPa, 204.2 MPa, and 19.4%, respectively, with the lowest absolute values of strength for different orientations.

In this study, Cu-Sn-Ti-Cr and Cu-Sn-Ti-Cr-Ce alloys are prepared by vacuum melting, and their hardness, conductivity and strength are tested after aging treatment. The results show that Cu-Sn-Ti-Cr-Ce alloy exhibits the best mechanical properties after 50% cold rolling and aging treatment at 450 ℃ for 60 min. The hardness reaches 290HV and the conductivity is 20.1% IACS. By EBSD analysis, it is found that the Ce element can inhibit the grain growth and refine the grain size. Compared with Cu-Sn-Ti-Cr alloy, the addition of rare earth element Ce decreases the size and increases the amount of precipitated phase, which improves the properties of the alloy.