Method for preparing nanocrystalline metal material containing nano-sized precipitates within crystal

A metal material, nano-sized technology, applied in the field of preparation of nanocrystalline materials, can solve the problems of limiting the composition range of nanocrystalline materials, precipitation phase (uneven distribution of intermetallic compounds, reducing the mechanical properties of nanocrystalline materials, etc.) The effect of cracks and small fluctuations

Active Publication Date: 2015-06-24
YANSHAN UNIV
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Problems solved by technology

In the first type of approach, the distribution of precipitated phases (intermetallic compounds) formed by amorphous crystallization is quite uneven, thereby reducing the mechanical properties (strength and plasticity) of the prepared nanocrystalline materials, and the amorphous alloy must have the ability to form The specific chemical composition of amorphous greatly limits the composition range of prepared nanocrystalline materials

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  • Method for preparing nanocrystalline metal material containing nano-sized precipitates within crystal
  • Method for preparing nanocrystalline metal material containing nano-sized precipitates within crystal
  • Method for preparing nanocrystalline metal material containing nano-sized precipitates within crystal

Examples

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Effect test

Embodiment 1

[0024] The melting and casting 7075Al alloy (chemical composition mass percent wt% is: 5.6Zn, 2.5Mg, 1.6Cu, 0.5Fe, 0.4Si, 0.3Mn, 0.23Cr, 0.2Ti, the rest Al .) Heated to 480 ° C and kept for 5 hours for solution treatment, and then water quenched to room temperature. From the optical microstructure, the average grain size of the solution-treated 7075Al alloy is about 380 μm; the transmission electron microscope analysis of the solution-treated 7075Al alloy shows that the remaining second phase particles are almost invisible, almost all alloys All the elements dissolve in the Al matrix to form a single-phase solid solution coarse-grained 7075Al alloy. Since the concentrations of the above-mentioned alloying elements Zn, Mg, Cu, Fe, Si, Mn, Cr, and Ti are higher than their solubility at room temperature, Therefore, the alloying elements are supersaturated and dissolved in the Al matrix.

[0025] At room temperature, put the single-phase solid solution coarse-grained 7075Al alloy...

Embodiment 2

[0028] The melt-cast 7075Al alloy (chemical composition mass percentage % is: 5.6Zn, 2.5Mg, 1.6Cu, 0.5Fe, 0.4Si, 0.3Mn, 0.23Cr, 0.2Ti, the rest Al. ) was heated to 480°C and kept for 5 hours for solution treatment, and then water quenched to room temperature.

[0029] At the temperature of liquid nitrogen (-196°C), put the above-mentioned coarse-grained 7075Al after high-temperature solution treatment into the space formed by the grooves of the upper and lower anvils, and twist it 10 times at a high pressure under a pressure of 6GPa, and observe it with a transmission electron microscope It can be seen that a single-phase solid solution nanocrystalline 7075Al alloy composed of nanocrystalline grains has been formed with an average grain size of 38 nm.

[0030] Put the single-phase solid solution nanocrystalline 7075Al alloy composed of the above-mentioned nanocrystalline grains into the pyrophyllite (pressure transmission medium) cavity in the octahedral high-pressure space of...

Embodiment 3

[0032]The melt-cast 2024Al alloy (mass percent composition: 4.5Cu, 1.5Mg, 0.5Mn, and the rest of Al) extruded by homogenization annealing and pre-plastic deformation was heated to 493°C and kept for 5 hours for solution treatment, and then water quenched to room temperature . From the optical microstructure, the average grain size of the solution-treated 2024Al alloy is about 390 μm; the transmission electron microscope analysis of the solution-treated 2024Al alloy shows that the remaining second phase particles are almost invisible, almost all alloys All the elements dissolve in the Al matrix to form a single-phase solid solution coarse-grained 2024Al alloy. Since the concentrations of the above-mentioned alloying elements Cu, Mg, and Mn are higher than their solubility at room temperature, the alloying elements are supersaturated and dissolved in the Al matrix.

[0033] At room temperature, the single-phase solid solution coarse-grained 2024Al alloy in which the above-mentio...

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Abstract

The invention provides a method for preparing a nanocrystalline metal material containing nano-sized precipitates within a crystal. The method comprises the following steps of firstly, performing high-temperature solution treatment on a coarse crystalline metal material, thereby obtaining single phase solid solution with supersaturated and dissolved alloy element, wherein the coarse crystalline metal material contains alloy element in a matrix, and the solid solubility is reduced as the temperature is reduced; then, performing severe plastic deformation and high-pressure reverse processing at or below the room temperature, thereby obtaining single phase solid solution nanocrystalline material composed of nanocrystalline grains with supersaturated and dissolved alloy element; and finally, ageing the obtained nanocrystalline material at a pressure of 3-25 GPa and at a temperature of 100-800 DEG C, and holding the temperature for 5-8 h, thereby obtaining a nanocrystalline metal material containing nano-sized precipitates within a crystal. The method provided by the invention is wide in suitable material component range, and can be used for effectively avoiding severe plastic deformation to produce microcrack in a material, and the prepared nano-sized precipitates in the nanocrystalline material are distributed uniformly.

Description

technical field [0001] The invention relates to a preparation method of nano crystal material. Background technique [0002] The characteristic of nanocrystalline materials is that the grain size is less than 100nm, resulting in the existence of a high volume fraction of grain boundaries in the material. Due to the strengthening effect of grain boundaries, this type of material has high strength and is a promising high-performance structure. Material. However, the low toughness of such materials, especially the low tensile toughness, is an important reason that limits the wide application of such materials. The root of the low toughness of this type of material is that dislocations cannot be accumulated in the grains during the plastic deformation process, which makes this type of material lack of work hardening ability, and is prone to strain localization, resulting in necking and fracture under low strain conditions. Among the various approaches designed by material scie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22F1/057C21D8/00C22F1/08C22F1/06C22F1/10C22F1/18
Inventor 林耀军刘学建
Owner YANSHAN UNIV
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