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Process method for purifying aluminum substrate through solid-state phase change

A process method and solid-state phase transformation technology, applied in the field of aluminum alloy processing, can solve the problems of yield rate and product quality decline, high work hardening rate, cost increase, etc., and achieve industrial scale production, economical process system, and wide applicability Effect

Inactive Publication Date: 2013-06-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to pursue low rolling work hardening rate, manufacturers have to use raw material aluminum or aluminum alloy with higher purity, but this will lead to a substantial increase in cost, and the less the content of Fe and Si impurity elements, the higher the purity. The material cost is also higher; if a lower purity material is used in order to reduce the cost, it will lead to a decline in yield and product quality due to its high work hardening rate

Method used

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  • Process method for purifying aluminum substrate through solid-state phase change
  • Process method for purifying aluminum substrate through solid-state phase change
  • Process method for purifying aluminum substrate through solid-state phase change

Examples

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Effect test

Embodiment 1

[0033] A process method for purifying the aluminum matrix through solid-state phase transformation. The 1.0mm thick hot-rolled plate (AA1235 alloy) is annealed at 380℃×6h, then cold-rolled to 0.3mm (the deformation is 70%), and then Supplementary annealing treatment at 210℃×15h.

[0034] The X-ray diffraction lattice constant method was used to quantitatively measure the concentration of Fe and Si elements in the matrix. The results showed that the contents of Fe and Si elements in the matrix were reduced to 0.009at% and 0.03at% respectively. The processed alloy has good rolling processability, greatly reduced work hardening rate, easy to reduce and reduce thickness, can be cold rolled to 6~6.5mm, and the yield is up to 85%.

Embodiment 2

[0036] A process method for purifying the aluminum matrix through solid-state phase transformation. The 2.6mm thick hot-rolled plate (AA5052 alloy) is annealed at 350℃×2h, then cold-rolled to 0.55mm (the deformation is 79%), and then Supplementary annealing treatment at 225℃×2h.

[0037] The X-ray diffraction lattice constant method was used to characterize the concentration of Fe and Si elements in the matrix. The results showed that the content of Fe and Si elements in the alloy matrix after the treatment was reduced to 0.007at% and 0.02at% respectively. The treated alloy has good rolling processing performance, greatly reduced work hardening rate, low rolling pressure, easy to deform, and can be cold rolled to below 20mm.

Embodiment 3

[0039] A process method for purifying the aluminum matrix through solid-state phase transformation. The 1.0mm thick hot-rolled plate (AA1235 alloy) is annealed at 340°C for 16h, then cold-rolled to 0.6mm (with a deformation of 40%), and then Supplementary annealing treatment at 180℃×15h.

[0040] The X-ray diffraction lattice constant method was used to quantitatively measure the concentration of Fe and Si elements in the matrix. The results showed that the contents of Fe and Si elements in the matrix were reduced to 0.0095at% and 0.038at% respectively. The processed alloy has good rolling processability, greatly reduced work hardening rate, easy to reduce and reduce thickness, can be cold rolled to 6~6.5mm, and the yield is up to 85%.

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Abstract

The invention relates to a process method for purifying an aluminum substrate through solid-state phase change. A phase change reaction and a phase change degree are controlled by selecting proper thermal treatment temperature and time according to a difference of phase components (AlFeSi) of different crystal structures in an aluminum alloy and thermodynamic and dynamics characteristics of phase change; and the contents of Fe and Si impurity elements in the aluminum substrate are effectively reduced on the premise that the overall material components are not changed so as to achieve the purposes of purifying an alloy substrate, reducing mill processing hardening rate and improving mill processing properties. The method is provided based on the property of the AlFeSi phase in the aluminum alloy and a phase change law, lays emphasis on reasonable process control and matching attributes between processes, is wide in applicability, convenient for industrial mass production and good in purification effect and controllable in purification effect. The process method provided by the invention is suitable for aluminum alloys of 1XXXX series, 5XXX series and 8XXX series.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a process method for purifying an aluminum matrix through solid phase transformation. [0002] Background technique [0003] Aluminum sheet, strip and foil products are widely used in various sectors of national production due to their excellent mechanical properties, corrosion resistance and dimensional accuracy. In order to ensure the surface quality of the product, after the large deformation hot rolling process, cold rolling deformation is usually used to make the product meet the final thickness requirement. To make the cold rolling process go smoothly, the rolling work hardening rate of the aluminum matrix must be controlled, especially for foil products, the control of the work hardening rate is very critical. If the work hardening rate is too high, it is easy to cause problems such as broken belt defects, difficulty in pressing and thinning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 张静潘复生赵婧婧
Owner CHONGQING UNIV
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