Technical method for thinning the solidification structure of aluminun alloy

A technology of solidification structure and process method, which is applied in the field of refinement process of aluminum alloy solidification structure, can solve the problem of not systematically and comprehensively studying pulse current, etc., and achieve the effect of simple production equipment, simple process method and improved mechanical properties

Inactive Publication Date: 2003-05-07
SHANGHAI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Their research experiments did not systematically and comprehensively study the specific main parameters of pulse current, such as the regularity of changes in pulse width and pulse frequency on the refinement of aluminum alloy solidification structure

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0017] The process is completely the same as that of the first embodiment above, except that the adjusted pulse current parameters are different. In this embodiment, the pulse frequency is 100Hz, the pulse width is 1 / 100, and the current density is 2000A / cm 2 . In this embodiment, a lower pulse frequency is used, and the pulse width is also smaller. However, the refinement effect of the aluminum alloy crystal phase structure is also more obvious. The primary α-Al phase in the white part was observed by metallographic microscope, showing a uniform rosette-shaped and oval-shaped non-dendritic structure; the eutectic structure in the black part was in the shape of fine needles and flakes. Its grain size is 1 / 20-1 / 30 of the grain size of ordinary conventionally solidified aluminum alloys.

Embodiment 3

[0019] The process is completely the same as that of the first embodiment above, except that the adjusted pulse current parameters are different. In this embodiment, the pulse frequency is 200Hz, the pulse width is 1 / 5, and the current density is 10A / cm 2 . This embodiment uses a medium-sized pulse frequency and a large pulse width. However, the refinement effect of the aluminum alloy crystal phase structure is not obvious. However, compared with the metallographic structure of the conventional casting process, it is found that the primary α-Al phase in the white part does not have a coarse dendrite structure; the eutectic structure in the black part still has segregation; its grain size is ordinary The metallographic grain size of the casting process is 1 / 3-1 / 2, and the uniformity is also average.

Embodiment 4

[0021] The process is completely the same as that of the first embodiment above, except that the adjusted pulse current parameters are different. In this embodiment, the pulse frequency is 500Hz, the pulse width is 1 / 10, and the current density is 100A / cm 2 . This embodiment uses a higher pulse frequency and a larger pulse width. The primary α-Al phase of the white part is observed by a crystal phase microscope, showing a uniform rosette-shaped and oval-shaped non-dendritic structure; the eutectic structure of the black part has a grain size equal to that of a common conventional casting process 1 / 20-1 / 10 of the metallographic grain size.

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Abstract

A technology for fining the solidified Al-alloy structure includes proportioning raw materials, conventional smeling, removing slags and gas, refining, casting while applying a pulse electric field, and cooling.

Description

technical field [0001] The invention relates to a process method for refining the solidification structure of aluminum alloy, which belongs to the field of metal alloy manufacturing process and metamorphic treatment process. Background technique [0002] The research and discussion on metal structure refinement technology is one of the very important research fields in the research of metal materials, because grain refinement is the only way to improve the plasticity index of materials without sacrificing the material strength index. There are two main types of existing metal structure refinement methods: one is the chemical refinement method, which is to add modifiers, including nucleating agents and growth inhibitors, to the liquid metal; the other is the physical refinement method, Or dynamic method, such as vibration method, including mechanical vibration, electromagnetic vibration and sound wave or ultrasonic vibration, etc.; stirring method, including mechanical stirri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D21/04B22D27/02
Inventor 邵光杰张恒华顾华英方妍妍
Owner SHANGHAI UNIV
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