Equal channel deformation mould for preparing block body ultrafine grain metal

Abstract

The present invention discloses an equal-channel deformation mould for preparing block-body ultra fine grain metal. Said equal-channel deformation mould includes the following several portions: pressure rod, upper mould, fastening sleeve, lower mould and base seat, in the upper mould interior and lower mould interior are respectively cut two crossed equal-diameter channels. Besides, said invention also provides the concrete structure of above-mentioned every portion, and also provides the concrete application method of said equal-channel deformation mould.

Description

technical field

[0001] The invention relates to a mold for metal plastic processing, in particular to an equal-channel deformation mold for preparing bulk ultrafine-grained metal. Background technique

[0002] The bulk ultrafine-grained metals of 0.1-1 μm have a series of excellent physical and mechanical properties due to the small grain size and unique defect structure such as high-angle grain boundaries. The preparation of bulk ultrafine-grained materials by strong plastic deformation has attracted great attention. Traditional pressure processing techniques such as rolling, extrusion, drawing, etc. can refine grains, but the shape and size of the workpiece after processing often limit its application; grain refinement to ultra-fine grain usually requires a true strain greater than 4, Therefore, traditional plastic processing technology is difficult to meet these requirements. More than 20 years ago, when the former Soviet scholar Segal was studying the deformation textu...

Examples

Embodiment 1

[0027] Embodiment 1: The deformation material is 99.999% high-purity aluminum, a square material of 12mm×12mm×80mm, which is annealed in a vacuum furnace at 400° C. and kept for 2 hours. The inner angle of the mold is 110°, and the outer angle of the mold is 0°. It is deformed at room temperature, and the pressing speed is about 0.15mm / s. Figure 4 is a transmission electron microscope photo after 12 passes of deformation.

Embodiment 2

[0028] Embodiment 2: The deformation material is oxygen-free copper (99.98%), square material of 12mm * 12mm * 80mm, annealed in a vacuum furnace at 600°C, kept for 1 hour, the inner angle of the mold is 90°, and the outer angle of the mold is 22°. Deformation at room temperature, the pressing speed is about 1.0mm / s. Fig. 5 is a transmission electron microscope photo after 12 passes of deformation.

technical field

[0001] The invention relates to a mold for metal plastic processing, in particular to an equal-channel deformation mold for preparing bulk ultrafine-grained metal. Background technique

[0002] The bulk ultrafine-grained metals of 0.1-1 μm have a series of excellent physical and mechanical properties due to the small grain size and unique defect structure such as high-angle grain boundaries. The preparation of bulk ultrafine-grained materials by strong plastic deformation has attracted great attention. Traditional pressure processing techniques such as rolling, extrusion, drawing, etc. can refine grains, but the shape and size of the workpiece after processing often limit its application; grain refinement to ultra-fine grain usually requires a true strain greater than 4, Therefore, traditional plastic processing technology is difficult to meet these requirements. More than 20 years ago, when the former Soviet scholar Segal was studying the deformation textu...

Examples

Embodiment 1

[0027] Embodiment 1: The deformation material is 99.999% high-purity aluminum, a square material of 12mm×12mm×80mm, which is annealed in a vacuum furnace at 400° C. and kept for 2 hours. The inner angle of the mold is 110°, and the outer angle of the mold is 0°. It is deformed at room temperature, and the pressing speed is about 0.15mm / s. Figure 4 is a transmission electron microscope photo after 12 passes of deformation.

Embodiment 2

[0028] Embodiment 2: The deformation material is oxygen-free copper (99.98%), square material of 12mm * 12mm * 80mm, annealed in a vacuum furnace at 600°C, kept for 1 hour, the inner angle of the mold is 90°, and the outer angle of the mold is 22°. Deformation at room temperature, the pressing speed is about 1.0mm / s. Fig. 5 is a transmission electron microscope photo after 12 passes of deformation.

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