Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method

A semi-solid slurry and billet technology, which is applied in the field of metal semi-solid slurry, can solve the problems of uneven structure and small sample size, and achieve the effect of good structure and performance and simple operation

Inactive Publication Date: 2012-07-11
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming that SIMA prepares semi-solid slurry, the object of the present invention is to provide a kind of technique for preparing semi-solid slurry that is simple, efficient, uniform in organization and performance, solves the structure that prepares semi-solid slurry in prior art Defects such as unevenness and small sample size

Method used

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  • Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method
  • Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method
  • Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method

Examples

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Embodiment 1

[0020] SIMA method of the present invention prepares ZCuSn10P1 tin bronze semi-solid slurry preparation method (see figure 1 ):

[0021] (1) Measure the liquidus-solidus line point of the semi-solid slurry alloy to be prepared; in this embodiment, the alloy is a ZCuSn10P1 tin-bronze alloy with a cylinder size of Φ19×22mm, and the differential scanning calorimetry (DSC) is used to measure the The solidus temperature of the alloy is 833 o C, the liquidus temperature is 1000 oC ;

[0022] (2) Heat the alloy billet above the recrystallization temperature, and use the open billet forging process to perform multi-pass, multi-fire elongation and upsetting of the billet; in this embodiment, the tin bronze is heated to 450 oC , and then thicken it once along the axial direction of the billet, with a reduction of 2 mm each time; finally, it is elongated, with a reduction of 1 mm per pass, and a total of 6 times of elongation. The deformation of the alloy billet reaches 30%; before...

Embodiment 2

[0025] SIMA method of the present invention prepares 5083 aluminum alloy semi-solid slurry preparation method (see figure 1 ):

[0026] (1) Measure the liquid-solidus line point of the semi-solid slurry alloy to be prepared; in this example, the alloy is a 5083 aluminum alloy with a cylinder size of Φ30×45mm, and the alloy is measured by differential scanning calorimetry (DSC) The solidus temperature is 571 o C, the liquidus temperature is 642 oC ;

[0027] (2) Heat the alloy billet above the recrystallization temperature, and use the blank forging process to elongate and upset the billet for multiple times and multiple fires; in this example, the aluminum alloy is heated to 460 oC , and then thicken it three times along the axial direction of the billet, with a reduction of 4mm each time; finally, it is elongated, with a reduction of 2mm per pass, and a total of 6 passes for elongation. The deformation of the alloy billet reaches 40%; before each elongation or upsetting...

Embodiment 3

[0029] Embodiment 3: SIMA method of the present invention prepares AZ91 magnesium alloy semi-solid slurry preparation method (see figure 1 ):

[0030] (1) Measure the liquidus-solidus point of the semi-solid slurry alloy to be prepared; in this example, the alloy is an AZ91 magnesium alloy with a cylinder size of Φ50×70mm, and the alloy is measured by differential scanning calorimetry (DSC) The solidus temperature is 503 o C, the liquidus temperature is 595 o C;

[0031] (2) Heating the alloy billet above the recrystallization temperature, and using the open billet forging process, the billet is drawn and upset for multiple times and multiple fires; in this embodiment, the magnesium alloy is heated to 300 oC , and then thicken it four times along the axial direction of the billet, each time the reduction is 6mm; finally, it is drawn out, each time the reduction is 4mm, a total of 6 times of elongation, after the billet forging The deformation of the alloy billet reaches 5...

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Abstract

The invention relates to the field of the preparation of semi-solid slurry, in particular to a method for preparing semi-solid slurry by a new strain induced melt activation (SIMA) method. By the method, the problem of quality defects during the preparation of the semi-solid slurry in the prior art is solved. The method comprises the following steps of: heating an alloy to above the recrystallization temperature according to liquidus and solidus points of a semi-solid slurry alloy to be prepared; drawing out and upsetting the alloy for multiple times by utilizing a cogging forging process; and heating the alloy to a semi-solid temperature interval to prepare the semi-solid slurry with a certain solid-phase rate. By the method, the semi-solid slurry of multiple alloys can be prepared, so the method has the advantages of simplicity of operation, convenience for control, high nodulizing rate, accurate control of the solid-phase rate and the like.

Description

technical field [0001] The invention relates to a method for preparing semi-solid slurry by SIMA method, belonging to the technical field of metal semi-solid slurry. Background technique [0002] Semi-solid metal technology is a technology between liquid and solid forming proposed in the 1970s. It has broad application prospects in the fields of automobiles, aviation, and aerospace due to its characteristics of stable filling, high compactness of parts, small thermal impact on the mold, high mechanical properties, and low forming force. Among them, the preparation of a semi-solid metal slurry with a uniform and fine non-dendritic structure is the most important link in the semi-solid metal forming technology, and is the key and basis of the semi-solid metal forming technology. The quality of the semi-solid slurry determines the quality of the subsequent processing methods and the final formed workpiece. [0003] At present, there are more than 20 kinds of semi-solid slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C9/02C22C23/00C22C21/00
Inventor 肖寒王佳周荣卢德宏蒋业华周荣峰吴龙彪
Owner KUNMING UNIV OF SCI & TECH
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