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CN-122013080-A - Rare earth magnesium alloy plate current homogenization treatment equipment and method

CN122013080ACN 122013080 ACN122013080 ACN 122013080ACN-122013080-A

Abstract

The invention provides a rare earth magnesium alloy plate current homogenization treatment device and a rare earth magnesium alloy plate current homogenization treatment method, which relate to the technical field of metal material heat treatment and comprise a pressurizing unit and a current homogenization unit; the pressurizing unit comprises a press, an upper pressing plate and a lower pressing plate, the current homogenizing unit comprises a supporting frame, a power supply, a positive treatment electrode and a negative treatment electrode, the positive treatment electrode and the negative treatment electrode are respectively positioned on two opposite sides of the lower pressing plate and are both used for being abutted against the end face of the plate to be treated, so that the current flow direction between the positive treatment electrode and the negative treatment electrode after being electrified is perpendicular to the streamline direction of the second phase of the plate to be treated. Experiments prove that after the treatment of the invention, the coarse chain-shaped second phase in the plate is dissolved into particles, thereby realizing tissue homogenization, the area ratio of the second phase in the plate treated by the method is reduced to about 7% from about 20% of the original area ratio, and the treatment effect is better.

Inventors

  • XU JIE
  • YU JUN
  • LIU MINGSHUAI
  • WANG XIAOLIANG
  • DING CHAOGANG
  • SHAN DEBIN
  • GUO BIN

Assignees

  • 哈尔滨工业大学

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The rare earth magnesium alloy plate current homogenizing treatment device is characterized by comprising a pressurizing unit and a current homogenizing unit; The pressurizing unit comprises a press machine, an upper pressing plate (2) and a lower pressing plate (3); The upper pressing plate (2) is used for pressing the plate (5) to be processed, and the press machine is used for applying downward pressure to the upper pressing plate (2) so as to level the plate (5) to be processed; The current homogenizing unit comprises a support frame, a power supply, a positive treatment electrode (6) and a negative treatment electrode (7); The negative treatment electrode (7) is electrically connected with the negative electrode of the power supply; The support frame is positioned on the periphery of the lower pressing plate (3) and is fixed with the lower pressing plate (3), and the positive treatment electrode (6) and the negative treatment electrode (7) are both fixed on the support frame; The positive treatment electrode (6) and the negative treatment electrode (7) are respectively positioned at two opposite sides of the lower pressing plate (3) and are both used for abutting against the end face of the plate (5) to be treated, so that the current flow direction between the positive treatment electrode (6) and the negative treatment electrode (7) after the power is on is perpendicular to the streamline direction of the second phase of the plate (5) to be treated; The material of the plate (5) to be treated is rare earth magnesium alloy.
  2. 2. The rare earth magnesium alloy sheet material current homogenization treatment device according to claim 1, characterized in that the support frame comprises a square support frame (18), two support plates (16), two first conductive screws (9); The two support plates (16) are respectively positioned at two opposite ends of the square support frame (18), the support plates (16) are vertically arranged, and the support plates (16) are fixed with the square support frame (18) and positioned below the square support frame (18); the lower pressing plate (3) is positioned in the square supporting frame (18), and the supporting plate (16) is fixed with the lower pressing plate (3); The square support frame comprises a square support frame body, wherein two opposite sides of the square support frame body (18) are respectively provided with a first mounting hole (19), two first conductive screw rods (9) are respectively and horizontally arranged in the two first mounting holes (19) in a penetrating mode, two first fixing nuts (22) are screwed on each first conductive screw rod (9), and the two first fixing nuts (22) are respectively abutted with the outer wall and the inner wall of the square support frame body (18) so as to fix the first conductive screw rods (9) on the square support frame body (18); The first end of the first conductive screw rod (9) is positioned inside the square supporting frame (18), and the second end of the first conductive screw rod is positioned outside the square supporting frame (18); A first end of a first conductive screw rod (9) is used for fixing the positive treatment electrode (6), and a second end of the first conductive screw rod is electrically connected with the positive electrode of the power supply; the first end of the second first conductive screw rod (9) is used for fixing the negative treatment electrode (7), and the second end is electrically connected with the negative electrode of the power supply.
  3. 3. The rare earth magnesium alloy sheet material current homogenization treatment device according to claim 2, further comprising two conductive cylinders (8), wherein the two conductive cylinders (8) are respectively used for correspondingly fixing the positive treatment electrode (6) and the negative treatment electrode (7) on the two first conductive screws (9); one end of the conductive cylinder (8) is opened, and a perforation is arranged on the end face of the other end; The positive treatment electrode (6) and the negative treatment electrode (7) comprise a strip-shaped electrode plate (61) and a round electrode plate (62), wherein one surface of the round electrode plate (62) is fixed with one end of the strip-shaped electrode plate (61); The conductive cylinder (8) is sleeved at the first end of the first conductive screw (9), the circular electrode plate (62) is positioned in the conductive cylinder (8), the strip-shaped electrode plate (61) passes through the through hole and is positioned outside the conductive cylinder (8), one surface of the circular electrode plate (62) is abutted against the end face of the first end of the first conductive screw (9), the other surface of the circular electrode plate is abutted against the inner bottom wall of the conductive cylinder (8), and the inner wall of the conductive cylinder (8) is provided with an inner thread matched with the outer thread of the first conductive screw (9).
  4. 4. A rare earth magnesium alloy sheet material current homogenizing treatment apparatus according to claim 3, characterized in that the second end of the first conductive screw (9) is screwed with a connection nut (10).
  5. 5. The rare earth magnesium alloy sheet material current homogenization treatment device according to claim 4, further comprising a fixing screw (11), an inner insulating sleeve (12), an intermediate insulating sleeve (13), an outer insulating sleeve (14), and an insulating spacer (15); The lower pressing plate (3) and the supporting plate (16) are both made of metal, and the supporting plate (16) and the side wall of the lower pressing plate (3) are arranged in parallel at intervals; The support plate (16) is provided with a first connecting hole, and the lower pressing plate (3) is provided with a second connecting hole; The fixing screw (11) is arranged in the first connecting hole and the second connecting hole in a penetrating way so as to fix the supporting plate (16) and the lower pressing plate (3); The inner insulating sleeve (12), the middle insulating sleeve (13), the outer insulating sleeve (14) and the insulating gasket (15) are sleeved on the fixing screw (11) in sequence along the direction from the lower pressing plate (3) to the supporting plate (16); The inner insulating sleeve (12) is positioned between the lower pressing plate (3) and the supporting plate (16), one end of the inner insulating sleeve (12) is abutted with the lower pressing plate (3), and the other end is abutted with the supporting plate (16); one end of the middle insulating sleeve (13) is abutted with one end of the inner insulating sleeve (12) away from the lower pressing plate (3), and the other end is abutted with one end of the outer insulating sleeve (14) away from the insulating gasket (15); The outer insulating sleeve (14) is positioned on one side, far away from the lower pressing plate (3), of the supporting plate (16), one end of the outer insulating sleeve (14) is abutted against the supporting plate (16), the other end of the outer insulating sleeve is abutted against one end of the insulating gasket (15), and the other end of the insulating gasket (15) is abutted against the head of the fixing screw.
  6. 6. The apparatus for homogenizing treatment of rare earth magnesium alloy sheet material current as claimed in claim 5, further comprising a positive experimental electrode and a negative experimental electrode; the positive treatment electrode (6) and the negative treatment electrode (7) are positioned on a first side and a second side opposite to the square support frame (18); The positive experimental electrode and the negative experimental electrode are positioned on a third side and a fourth side opposite to the square supporting frame (18); The positive experimental electrode and the negative experimental electrode are respectively fixed on the square supporting frame (18) and are respectively and electrically connected with the positive electrode and the negative electrode of the power supply; The positive experimental electrode and the negative experimental electrode are both used for being abutted against the end face of the plate (5) to be treated, so that the current between the positive experimental electrode and the negative experimental electrode after the electrification is parallel to the streamline direction of the second phase of the plate (5) to be treated.
  7. 7. The rare earth magnesium alloy sheet material current homogenization treatment apparatus of claim 6, further comprising two second conductive screws (17); The side walls of the third side and the fourth side of the square supporting frame (18) are respectively provided with a second mounting hole (21), two second conductive screws (17) are respectively and horizontally arranged in the two second mounting holes (21) in a penetrating mode, two second fixing nuts are screwed on each second conductive screw (17), and the two second fixing nuts are respectively abutted with the outer wall and the inner wall of the square supporting frame (18) so as to fix the second conductive screws (17) on the square supporting frame (18); The first end of the second conductive screw rod (17) is positioned inside the square supporting frame (18), and the second end of the second conductive screw rod is positioned outside the square supporting frame (18); The first end of the first conductive screw rod (17) is used for fixing the positive experimental electrode, and the second end of the first conductive screw rod is electrically connected with the positive electrode of the power supply; The first end of the second conductive screw rod (17) is fixed with the negative experimental electrode, and the second end is electrically connected with the negative electrode of the power supply.
  8. 8. The rare earth magnesium alloy sheet material current homogenization treatment device according to claim 7, further comprising an upper heat insulating plate (1) and a lower heat insulating plate (4); The upper heat insulation plate (1) is used for being placed on the upper pressing plate (2) in use; The lower pressing plate (3) is arranged on the lower heat insulation plate (4); The upper heat insulating plate (1) and the lower heat insulating plate (4) are made of heat insulating materials.
  9. 9. The rare earth magnesium alloy sheet current homogenization treatment device according to claim 8, wherein two height limiting gaskets (20) are arranged at four corners of the upper surface of the lower pressure plate (3); The two height limiting gaskets (20) at each corner of the lower pressing plate (3) are mutually perpendicular and are respectively parallel to the side edges of the lower pressing plate (3); The thickness of the height limiting gasket (20) is equal to the target thickness of the plate (5) to be processed.
  10. 10. A rare earth magnesium alloy sheet material current homogenizing treatment method applied to the rare earth magnesium alloy sheet material current homogenizing treatment apparatus as claimed in any one of claims 1 to 9, characterized by comprising the steps of: placing a plate (5) to be treated on the lower pressing plate (3); pressing the upper pressing plate (2) on the plate (5) to be treated; Abutting the positive treatment electrode (6) and the negative treatment electrode (7) on the end face of the plate (5) to be treated, so that the current flow direction between the positive treatment electrode (6) and the negative treatment electrode (7) after being electrified is perpendicular to the streamline direction of the second phase of the plate (5) to be treated; starting a power supply and a press; The current between the positive treatment electrode (6) and the negative treatment electrode (7) flows through the plate, and the coarse chain-shaped second phase in the plate is dissolved into particles to realize tissue homogenization; After the plate is heated for a preset period of time, the power supply is turned off, and the plate is kept flat under the clamping action of the upper pressing plate (2) and the lower pressing plate (3) and gradually cooled; after the plate is cooled to a safe temperature, the press is closed, the upper pressing plate (2) is disassembled, and the plate is taken out, so that the current homogenization treatment of the plate (5) to be treated is completed.

Description

Rare earth magnesium alloy plate current homogenization treatment equipment and method Technical Field The invention relates to the technical field of metal material heat treatment, in particular to a rare earth magnesium alloy plate current homogenization treatment device and method. Background High performance rare earth magnesium alloys (e.g., mg-Gd, mg-Y series) are of great interest due to their excellent high temperature mechanical properties. Such alloys typically contain a high volume fraction of thermally stable second phases (such as LPSO phases or rare earth intermetallic compounds). These high-hardness second phases tend to be distributed in a continuous ribbon, chain or fiber form along the metal streamline after heat deformation such as extrusion or rolling. This high aspect ratio second phase aligned along the streamline is the source of serious anisotropy of the material. It not only causes the material to deteriorate in transverse plasticity and toughness, but also becomes a preferable channel for crack initiation in subsequent stress deformation. Therefore, the conversion of the continuous strip-shaped second phase into the dispersed fine spherical particles (i.e. spheroidization) is the key for improving the comprehensive performance of the rare earth magnesium alloy. The existing homogenizing annealing or spheroidizing process mainly relies on heat activated diffusion to coarsen, fracture, dissolve and redistribute the second phase, and generally has the problems of long treatment period, high energy consumption, limited effect on the heat stable phase and the like. For rare earth magnesium alloys containing higher volume fractions of long-period stacked ordered phases or other highly stable second phases, it is often difficult to effectively eliminate the directional continuous distribution characteristics of the second phase in a shorter time by means of conventional heat treatment alone. In recent years, current-assisted heat treatment techniques have been used to promote recovery, recrystallization, precipitated phase transformation and structure homogenization in metal materials due to the combination of joule heating effect and electric field coupling. Compared with the traditional heat treatment, the current auxiliary method is expected to improve the atomic diffusion rate and the interfacial migration capacity, so that the evolution process of the second phase is accelerated. However, in the prior art, the current-assisted heat treatment method mainly focuses on current magnitude, power-on time and temperature control, and the second phase occupation area after treatment is about 15%, so that the treatment method has poor effect. Disclosure of Invention The invention solves the problem that the existing treatment mode has poor treatment effect. In order to solve the problems, the invention provides a rare earth magnesium alloy sheet material current homogenization treatment device and a rare earth magnesium alloy sheet material current homogenization treatment method. The invention provides a rare earth magnesium alloy plate current homogenizing treatment device which comprises a pressurizing unit and a current homogenizing unit, wherein the pressurizing unit comprises a press machine, an upper pressing plate and a lower pressing plate, the lower pressing plate is used for placing a plate to be treated, the upper pressing plate is used for pressing the plate to be treated, the press machine is used for applying downward pressure to the upper pressing plate to level the plate to be treated, the current homogenizing unit comprises a support frame, a power supply, a positive treatment electrode and a negative treatment electrode, the positive treatment electrode is electrically connected with the positive electrode of the power supply, the negative treatment electrode is electrically connected with the negative electrode of the power supply, the support frame is located on the periphery of the lower pressing plate and is fixed with the lower pressing plate, the positive treatment electrode and the negative treatment electrode are respectively located on two opposite sides of the lower pressing plate and are respectively used for abutting against the end face of the plate to be treated, so that after the power is applied, the positive treatment electrode and the negative treatment electrode flow direction is perpendicular to the second phase magnesium alloy plate to be treated, and the magnesium alloy plate is made of a streamline material. The support frame comprises a square support frame, two support plates and two first conductive screws, the two support plates are respectively located at two opposite ends of the square support frame and vertically arranged, the support plates are fixed with the square support frame and located below the square support frame, the lower pressing plate is located in the square support frame, the support plates are fixed with the lower pressing plat