Machining method for preparing Al/Mg/Al alloy composite board by rolling

A processing method and composite plate technology, applied in the direction of metal rolling, temperature control, etc., can solve problems such as ineffectiveness, insufficient diffusion, and elaboration of annealing process, to eliminate stress, improve interface bonding force, and atomic diffusion ability strong effect

Inactive Publication Date: 2015-09-16
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annealing process is very critical. If the annealing temperature is too high, it will cause the formation of brittle intermediate phases, such as Al 3 Mg 2 phase, thus exacerbating the peeling of the bonding surface layer; the annealing temperature is too low, the diffusion between the two metal layers is not sufficient, and the desired effect cannot be

Method used

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  • Machining method for preparing Al/Mg/Al alloy composite board by rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The magnesium alloy and aluminum to be rolled are AZ31 and pure aluminum 1070, respectively.

[0023] Composite rolling the alloy plate:

[0024] a) Cutting the plates to be compound-rolled into shapes of equal size, cleaning and polishing the surface.

[0025] b) Sandwich a magnesium plate between two aluminum plates, then punch holes in the four corners and fix them with rivets.

[0026] c) Perform single-pass compound rolling on the fixed plate, the rolling reduction rate is 50%, the rolling temperature is 350° C., and the holding time before rolling is 15 minutes.

[0027] Composite panels were not annealed.

[0028] Obtain a kind of composite plate, under room temperature, tensile strength is 256MPa, and elongation is 11.1%, but slight interfacial delamination occurs in stretching process, and its tensile fracture scanning top view is as follows figure 1 (a) shown.

Embodiment 2

[0030] The magnesium alloy and aluminum to be rolled are AZ31 and pure aluminum 1070, respectively.

[0031] Composite rolling the alloy plate:

[0032] a) Cutting the plates to be compound-rolled into shapes of equal size, cleaning and polishing the surface.

[0033] b) Sandwich a magnesium plate between two aluminum plates, then punch holes in the four corners and fix them with rivets.

[0034] c) Perform single-pass compound rolling on the fixed plate, the rolling reduction rate is 50%, the rolling temperature is 350° C., and the holding time before rolling is 15 minutes.

[0035] To anneal composite panels:

[0036] The rolled Al / Mg / Al alloy composite plate is put into a heating furnace, heated to 200° C., kept for 2 hours, and then taken out of the furnace and air-cooled.

[0037] A composite plate with good comprehensive properties was obtained. At room temperature, the tensile strength was 248MPa, the elongation was 13%, and no interfacial peeling occurred during the...

Embodiment 3

[0039] The magnesium alloy and aluminum alloy to be rolled are AZ31 and pure aluminum 1070, respectively.

[0040] Composite rolling the alloy plate:

[0041] a) Cutting the plates to be compound-rolled into shapes of equal size, cleaning and polishing the surface.

[0042] b) Sandwich a magnesium plate between two aluminum plates, then punch holes in the four corners and fix them with rivets.

[0043] c) Perform single-pass compound rolling on the fixed plate, the rolling reduction rate is 50%, the rolling temperature is 350° C., and the holding time before rolling is 15 minutes.

[0044] To anneal composite panels:

[0045] The rolled Al / Mg / Al alloy composite plate is put into a heating furnace, heated to 250° C. for 2 hours, and then taken out of the furnace and air-cooled.

[0046] A composite plate with good comprehensive performance was obtained. At room temperature, the tensile strength was 231 MPa and the elongation was 20.7%. However, a slight interfacial peeling o...

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Abstract

The invention provides a machining method for preparing an Al/Mg/Al alloy composite board by rolling. The method comprises: (1) a composite rolling process of cutting a Mg alloy board and aluminum boards, which are to be compositely rolled, into shapes with equal sizes, and performing surface cleaning and polishing treatment, sandwiching and fixing the Mg alloy board between the two aluminum boards and performing single-pass composite rolling on the fixed boards, wherein the rolling reduction ratio is 30 to 60 percent, the rolling temperature is 300 to 450 DEG C, and time for heat preservation before rolling is 5 to 15min; (2) a composite board annealing process of placing the rolled Al/Mg/Al alloy composite board into a heating furnace, heating the Al/Mg/Al alloy composite board to 150 to 230 DEG C, preserving heat for 1 to 12 hours, and taking out the Al/Mg/Al alloy composite board for air cooling. According to the method, a unique annealing process is adopted, and at proper annealing temperature, the interface bonding force of two alloys can be strengthened and the formation of a fragile phase is avoided, so that the phenomenon of stripping of the composite board in a serving process is avoided.

Description

technical field [0001] The invention relates to a processing method of metal materials, in particular to a processing method of an Al / Mg / Al alloy composite plate prepared by rolling. Background technique [0002] As one of the lightest commercial metal structural materials, magnesium alloy has a series of advantages such as low density, high specific strength, high specific stiffness, good electromagnetic shielding ability, machining performance and easy recycling. , automotive, electronics and other fields are widely used. [0003] However, this type of alloy has a fatal shortcoming, poor corrosion resistance. This greatly limits its scope of application in certain fields. Therefore, it is of vital importance to study new production processes and develop magnesium alloys with better corrosion resistance. [0004] In order to overcome the weakness of poor corrosion resistance, many scholars have done a lot of research on it. One of the main methods to overcome the poor c...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B37/74
CPCB21B1/38B21B37/74B21B2001/386
Inventor 巫瑞智杨金亮王天资马旭东张景怀张密林
Owner HARBIN ENG UNIV
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