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Method for preparing semisolid slurry for ultralow temperature casting magnesium alloy

A magnesium alloy, semi-solid technology, applied in the field of metal material forming, can solve the problems of complexity, high equipment investment and working capital, etc., and achieve the effects of dendrite growth suppression, simple pulping process and equipment, and fine grains

Inactive Publication Date: 2003-12-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
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Problems solved by technology

The common feature of the above methods is that they either require mechanical agitation with complex processes and equipment, special materials must be used for equipment manufacturing to slow down wear, or very precise nucleation control processes are required, requiring high equipment investment and working capital

Method used

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  • Method for preparing semisolid slurry for ultralow temperature casting magnesium alloy
  • Method for preparing semisolid slurry for ultralow temperature casting magnesium alloy

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Embodiment Construction

[0038] The ultra-low temperature casting of AZ91D magnesium alloy is used to produce semi-solid slurry. According to the aforementioned process steps, the casting temperature is 590°C and the casting speed is 150mm / min. The comparison between the obtained slurry structure and the traditional casting and the chilled structure of the semi-solid slurry ingot after secondary heating (partial remelting) such as figure 1 shown. It can be seen that the ultra-low temperature casting grains are obviously refined, the dendrites degenerate significantly, and the microstructure presents a fine degenerated dendrite or rose structure. After secondary heating (partial remelting), the solid phase particles are round and uniform, which can fully meet the requirements of semi-solid forming.

[0039] Ultra-low temperature casting of ZK60 magnesium alloy is used to produce semi-solid slurry. According to the aforementioned process steps, the casting temperature is 620°C and the casting speed is ...

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Abstract

The method for preparing semisolid slurry for magnesium alloy ultralow temp. casting includes the processes and steps of melting magnesium, adding compound fire-resisting elements, adding alloy elements, heat-insulating and standing still and semicontinuous casing. Said invention utilizes the addition of compound fire-resisting elements to implement magnesium alloy smelting free from covering agent, and utilizes the pouring process which is made under the condition of the temperature of liquid phase line or the temperature below liquid phase link at a certain cooling rate after properly standing still to implement that its interior has no dirt inclusion or porosity.

Description

Technical field [0001] The invention belongs to the technical field of metal material forming. Background technique [0002] Due to the magnesium hcp crystal structure and relatively low thermal conductivity (at 300 °C, the thermal conductivity of pure aluminum is 234W m -1 ·℃ -1 , while pure magnesium is 150W·m -1 ·℃ -1 , and only 64% of Al), magnesium alloy casting can easily cause a series of problems such as coarse dendrites, component segregation, inclusions, loose structure, poor surface quality and large tendency of thermal cracking. [0003] Due to the above-mentioned many problems in magnesium alloy casting, the product quality is poor, and it is difficult to meet the needs of applications, especially the volume deformation of magnesium alloys. A large number of tests have shown that the semi-solid forming method is an effective and feasible technology to solve the above problems of magnesium alloys. [0004] The semi-solid metal forming method is a process met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00B22D21/04
Inventor 崔建忠乐启炽路贵民
Owner NORTHEASTERN UNIV
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