The invention relates to a novel nanometer titanium boride ceramic aluminum combined welding wire rod. Four steps includes that (1) a nanometer TiB2 particle ceramic-aluminum combined casting ingot isprepared; (2) the casting ingot is subject to homogenization treatment; (3) nanometer TiB2 particle ceramic-aluminum combined hot extrusion plastic forming is carried out; and (4) aluminum alloy welding wire rod drawing forming is carried out. The novel nanometer titanium boride ceramic aluminum combined welding wire rod solves the problem that the welding wire rod prepared through an existing preparing process and ingredient is low in welding performance. According to the technical scheme, potassium fluotitanate and potassium fluoborate are added into aluminum alloy melt and react in the melt to generate nanometer-size TiB2 particles, the novel aluminum alloy containing trace of nano ceramic particles is prepared, the nanometer-size ceramic particles can promote metal heterogeneous nucleation in a molten bath, the welding seam structure is refined, the aluminum alloy connection efficiency is improved, and the welding strength is improved.

Novel nanometer titanium boride ceramic aluminum combined welding wire rod

The invention provides a high-strength aluminum alloy for additive manufacturing and a preparation method of high-strength aluminum alloy powder. The high-strength aluminum alloy powder is prepared byadopting a gas atomization process. The preparation method comprises the following steps of: firstly, melting an Al-Si-Zn-Cu-Mg-X alloy prefabricated ingot by adopting a medium frequency induction furnace, then powdering by adopting a supersonic speed gas atomization process, sieving and preparing powder of different specifications for additive manufacturing. A test sample obtained by adopting the high-strength aluminum alloy powder through additive manufacturing has compact texture without crack defects, the strength of extension exceeding 500MPa and the elongation exceeding 3%; the strengthperformance of the test sample is obviously superior to the strength performance of additive manufacturing test samples of AlSi10Mg, AlSi7Mg and AlSi12; and the performances of the test sample are also superior to the performances of additive manufacturing test samples of conventional 2000 series and 7000 series alloys. The alloy powder can be used for preparing aluminum alloy parts with compacttexture, complicated shapes and high strength in an additive manufacturing method to meet the requirements of use occasions on high specific strength and complicated shapes in the fields of aviation,spaceflight and automobiles.

High-strength aluminum alloy for additive manufacturing and preparation method of high-strength aluminum alloy powder

Effect of Rare Earth Elements Erbium and Europium Addition on Microstructure and Mechanical Properties of A356 (Al–7Si–0.3Mg) Alloy

The invention relates to a preparation method of Al-Mg-Mn-Sc-Zr aluminum alloy powder for additive manufacturing. The preparation method comprises the following steps of adding pure aluminum ingots toa crucible of an intermediate frequency furnace, and preheating the aluminum ingots; increasing the temperature of a smelting chamber to 700 to 850 DEG C, and introducing argon to the smelting chamber when pure aluminum is molten, so that the pressure of the smelting chamber is 0.6 to 0.9 MPa; increasing the melt temperature in the crucible to 1150 to 1300 DEG, adding pure manganese and pure zirconium, and insulating for 15 to 25 min; lifting the crucible, cooling to 800 to 900 DEG C, adjusting the pressure of the smelting chamber to 0.3 to 0.7 MPa, adding Al-Sc intermediate alloy, and insulating for 5 to 15 min after melting; lowering the melt temperature in the crucible to 700 to 790 DEG C, adjusting the pressure of the smelting chamber to 0.05 to 0.15 MPa, and adding pure magnesium ingots; and keeping the crucible at 780 to 820 DEG C after the magnesium ingots are completely molten; and preparing powder in a gas atomization powder preparation mode. Compared with existing aluminum alloy powder for additive manufacturing, the aluminum alloy powder prepared by adopting the preparation method has good geographical performance, additionally, the preparation process is simple, the preparation cost is low, and the preparation method has great significance to the additive manufacturing.

Al-Cu-Li-Sc-Zr aluminum alloy powder for additive manufacturing and preparation method thereof

In transportation light metal matrix composites (L-MMCs) are used increasingly due to their improved creep resistance even at higher application temperatures. Therefore, the creep behavior and failure mechanisms of creep loaded particle reinforced L-MMCs have been investigated intensively. Until now, creep damage analyses are usually performed ex situ by means of interrupted creep experiments. However, ex situ methods do not provide sufficient information about the evolution of creep damage. Hence, in situ synchrotron X-ray 3D-µ-tomography investigations were carried out enabling time and space resolved studies of the damage mechanisms in particle-reinforced titanium- and aluminum-based metal matrix composites (MMCs) during creep. The 3D-data were visualized and existing models were applied, specifying the phenomenology of the damage in the early and late creep stages. During the early stages of creep, the damage is determined by surface diffusion in the matrix or reinforcement fracture, both evolving proportionally to the macroscopic creep curve. In the late creep stages the damage mechanisms are quite different: In the Al-MMC, the identified mechanisms persist proportional to creep strain. In contrast, in the titanium-MMC, a changeover to the mechanism of dislocation creep evolving super-proportionally to creep strain occurs.

/pdf/in-situ-3d-u-tomography-on-particle-reinforced-light-metal-4ngi99bt23.pdf

In Situ 3D-µ-Tomography on Particle-Reinforced Light Metal Matrix Composite Materials under Creep Conditions

The invention relates to a method for improving the structure property uniformity of an in-situ particle enhanced aluminum-based composite material. The method comprises the following steps: performing homogenized thermal treatment on a particle enhanced aluminum-based composite material obtained by in-situ self-generation casting through an alloy element; performing unidirectional hot extrusion deformation on the homogenized in-situ particle enhanced aluminum-based composite material; performing hot rolling on the in-situ particle enhanced aluminum-based composite material subjected to hot extrusion; performing T6 thermal treatment on the rolled in-situ particle enhanced aluminum-based composite material to complete the treatment. By the adoption of two-step orthogonal thermal deformation, the method is favorable for breaking aggregation of self-generated ceramic particles in the in-situ particle enhanced aluminum-based composite material to obtain a uniformly dispersed and distributed ceramic enhanced phase; by the combination of unidirectional extrusion and orthogonal rolling, aluminum matrix crystalline grains can be effectively refined, and a relatively thin and equiaxial matrix crystal grain structure is prepared, so that the uniformity of the structure property of the in-situ particle enhanced aluminum-based composite material is improved.

Method for improving structure property uniformity of in-situ particle enhanced aluminum-based composite material

The invention relates to a method for preparing a high-strength high-plasticity aluminum-based composite material. High-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr intermediate alloy, KBF and K TiF serve as raw materials, and by the adoption of an in-situ melt synthesis control method, the in-situ TiB micro-nano particle reinforced Al-Zn-Mg-Cu alloy composite material is prepared. The extrusion deformation direction of each pass is perpendicular to the extrusion direction of the last pass. Extrusion deformation is conducted in multi-pass orthorhombic laminated extrusion mold equipment, a large amount of accumulated shearing strain can be applied to the particle reinforced aluminum-based composite material, and then the mechanical stirring function is achieved. In-situ synthesis TiB particle aggregates in the composite material are scattered, micro-nano TiB particles are evenly dispersed and distributed in an aluminum matrix, Al-Zn-Mg-Cu matrix grain structures of the composite material can be refined, and even and fine isometric crystals are obtained. The aluminum-based composite material prepared through the method can achieve high strength and high plasticity simultaneously.

Method for preparing high-strength high-plasticity aluminum-based composite material

The invention discloses a preparation method of a high-volume-fraction particle reinforced aluminum based composite material, belonging to the technical field of composite materials. The preparation method comprises the following steps: pressing ceramic particles to be prefabricated blocks in a mold, and heating the prefabricated blocks and the mold; melting aluminum alloy, pouring an aluminum alloy melt into the mold to ensure that the mold, the prefabricated blocks and the aluminum alloy can keep the same temperature, exerting pressure to the melt, and synchronously performing air pumping on the prefabricated blocks to ensure that the aluminum alloy is effectively infiltrated into pore gaps of the prefabricated blocks, and thus the high-volume-fraction particle reinforced aluminum based composite material is prepared. According to the preparation method disclosed by the invention, by utilizing the characteristic that the mold, the prefabricated blocks and the aluminum alloy melt have equal temperature, good flowability of the aluminum alloy melt in an infiltration process can be ensured, so that the aluminum alloy melt can be fully infiltrated into the pore gaps of ceramic powder prefabricated blocks; and meanwhile, the lower part of each prefabricated block is subjected to air pumping, gas in the prefabricated blocks is discharged, and vacuum is formed in the pore gaps to facilitate the implementation of the infiltration process. The preparation method disclosed by the invention is simple in equipment and convenient to operate, and has good promotion prospects.

Preparation method of high-volume-fraction particle reinforced aluminum based composite material

The invention provides a preparation method of 7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing. The preparation method comprises the following steps: heating commercially pure aluminum; after covering with a high-temperature covering agent, raising the temperature and smelting; uniformly mixing KBF4 and K2TiF6; after drying, adding a mixture into a melt; after reacting, sequentially adding a needed intermediate alloy, commercially pure Mg and commercially pure Zn; adding a refining agent into the melt and carrying out degassing and refining; then carrying out gas atomization to obtain the 7XXX series in-situ aluminum-based composite material powder. According to the method provided by the invention, an in-situ TiB2 micron-nano-sized particle enhanced 7XXX series composite material is prepared by adopting an in-situ melt automatic generation and high-temperature gas atomization method; TiB2 particle enhanced aluminum-based composite materialpowder is prepared; TiB2 particles are uniformly dispersed in an aluminum matrix. The aluminum-based composite material powder prepared by the method has a good laser absorption rate and is suitablefor a laser additive manufacturing technology.

7XXX series in-situ aluminum-based composite material powder for laser additive manufacturing and preparation

The invention provides a preparation method of 6XXX-series in-situ aluminum-based composite material powder for laser additive manufacturing. The preparation method of the 6XXX-series in-situ aluminum-based composite material powder for laser additive manufacturing comprises the steps of heating commercially pure aluminum, covering through a high-temperature covering agent, and heating for smelting; uniformly mixing KBF4 and K2TiF6, drying, and adding into a melt; after reaction, sequentially adding a required intermediate alloy and commercially pure Mg, adding a refining agent into the melt for degassing and refining, and then carrying out gas atomization; and obtaining the 6XXX-series in-situ aluminum-based composite material powder for laser additive manufacturing. According to the method, the in-situ TiB2 micro-nano-particle reinforced 6XXX-series composite material is prepared by adopting an in-situ melt growth and high-temperature gas atomization method, and through preparing theTiB2 particle reinforced aluminum-based composite material powder, TiB2 particles are uniformly and dispersedly distributed in an aluminum matrix. The aluminum-based composite material powder prepared through the method has favorable laser absorptivity and is applicable to a laser additive manufacturing technology.

6XXX-series in-situ aluminum-based composite material powder for laser additive manufacturing, and preparation

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