Technical method for thinning the solidification structure of aluminium alloy

A technology of solidification structure and process method, applied in the field of refining process of solidification structure of aluminum alloy, can solve the problem of lack of systematic and comprehensive research on pulse current, etc., and achieve the effect of simple production equipment, simple process method, and improved mechanical properties

Inactive Publication Date: 2006-06-14
SHANGHAI UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The melting and refining process of the aluminum alloy ingredients is as described above. The obtained aluminum alloy mother liquor is inserted into a graphite electrode at 650-750°C, and pulsed direct current is passed through, and the parameters of the pulse current are adjusted. The pulse frequency is 1000Hz, the pulse width is 1 / 10, and the current density is 20A / cm 2 . After natural cooling to room temperature and solidification, the metallographic structure of the aluminum alloy obtained was observed by a metallographic microscope, and it was found that the white part was the primary α-Al phase, showing a granular or rose-shaped mixed form, and the black part was eutectic Tissue, in the form of fine needles and flakes.

[0015] The aluminum alloy treated by the pulse electric field using the method of the present invention can be compared with the traditional conventionally solidified aluminum alloy. Its α-Al phase presents obvious developed dendrites, and altho...

Embodiment 2

[0018] 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

[0020] 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
current densityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a refining process method for the solidification structure of aluminum alloy, which comprises the steps of conventional melting, slag removal, degassing and refining of aluminum alloy ingredients. A graphite electrode is inserted into the alloy mother solution, a pulsed direct current is applied, and the parameters of the pulsed current are adjusted, and finally it is naturally cooled to room temperature to obtain an aluminum alloy billet with refined grains and uniform structure. The temperature of the aluminum alloy mother liquor when the graphite electrode is inserted is 650-750°C, and the parameters of the pulsed direct current supplied are: the pulse frequency is 100-2000Hz, the pulse width is 1 / 100-1 / 5, and the current density is 10 -2000A / cm 2 .

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02B22D21/04
Inventor 邵光杰张恒华顾华英方妍妍
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap