MANUFACTURING PROCESS OF HIGH-STRENGTH ALUMINUM ALLOY WIRE/STRIP

Abstract

A manufacturing process of a high-strength aluminum alloy wire/strip includes the following steps: A. subjecting an alloy to smelting and spray forming to obtain a high-strength Al—Zn—Mg—Cu aluminum alloy blank; B. subjecting the blank to semi-solid upset forging to form an ingot; C. subjecting the ingot to hot extrusion and then to vacuum annealing to form a coiled material; D. subjecting the coiled material to hot continuous rolling to obtain a wire blank; and E. subjecting the wire blank to solution heat treatment, multiple stretching treatments, annealing, and multiple continuous stretching treatments to obtain the high-strength aluminum alloy wire/strip. The high-strength aluminum alloy wire/strip has the characteristics of fine and compact grains, uniform structure, clear grain boundaries, no precipitates, and no layered structure affecting the stretching performance.

Claims

1. A manufacturing process of a high-strength aluminum alloy wire/strip, comprising the following steps: A. subjecting an alloy to smelting and spray forming to obtain a high-strength Al—Zn—Mg—Cu aluminum alloy blank; B. subjecting the high-strength Al—Zn—Mg—Cu aluminum alloy blank to semi-solid upset forging to form an ingot; C. subjecting the ingot to hot extrusion and then to vacuum annealing to form a coiled material; D. subjecting the coiled material to hot continuous rolling to obtain a wire blank; and E. subjecting the wire blank to solution heat treatment, multiple stretching treatments, annealing, and multiple continuous stretching treatments to obtain the high-strength aluminum alloy wire/strip.

2. The manufacturing process according to claim 1, wherein the high-strength Al—Zn—Mg—Cu aluminum alloy has a composition of Al—xZn—yMg—zCu, and the components have weight percentages as follows: 3.5%≤x≤22%, 1.5%≤y≤10%, 1.0%≤z≤10%, and the other is Al.

3. The manufacturing process according to claim 1, wherein the high-strength Al—Zn—Mg—Cu aluminum alloy blank obtained in step A has a diameter of 90 mm to 600 mm and a length of 200 mm to 1,200 mm.

4. The manufacturing process according to claim 1, wherein the semi-solid upset forging in step B is conducted at 460° C. to 575° C., and the ingot formed after the semi-solid upset forging has a diameter of 30 mm to 330 mm.

5. The manufacturing process according to claim 1, wherein in step C, the hot extrusion is conducted at 380° C. to 480° C. and at an extrusion ratio of (20-90):1, and a coiled ingot obtained after subjecting the ingot to hot extrusion has a diameter/thickness of 5 mm to 10 mm.

6. The manufacturing process according to claim 1, wherein in step C, the vacuum annealing is conducted at 200° C. to 300° C. for 10 h to 24 h, and then cooling in a furnace is performed.

7. The manufacturing process according to claim 1, wherein the wire blank in step D has a diameter/thickness of 3.4 mm to 3.6 mm.

8. The manufacturing process according to claim 1, wherein in step E, the solution heat treatment is conducted at 420° C. to 570° C. for 2 h, and then quenching in water is performed.

9. The manufacturing process according to claim 1, wherein in step E, the annealing is conducted at 200° C. to 400° C. for 10 h to 24 h, and then cooling in a furnace is performed; the multiple continuous stretching treatments are conducted at a compression ratio of 5% to 25%; and the high-strength aluminum alloy wire/strip has a diameter/thickness of 0.8 mm to 3.2 mm.

10. The manufacturing process according to claim 1, wherein the hot continuous rolling is conducted in the manner of skew rolling.

11. The manufacturing process according to claim 3, wherein the semi-solid upset forging in step B is conducted at 460° C. to 575° C., and the ingot formed after the semi-solid upset forging has a diameter of 30 mm to 330 mm.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

Example 1

[0022] 7055 aluminum alloy was subjected to smelting and spray forming to obtain a blank with a diameter of 220 mm; then the blank was subjected to semi-solid upset forging at 460° C. to obtain an ingot with a diameter of 176 mm; the ingot was subjected to hot extrusion at 380° C. and an extrusion ratio of 86:1 to obtain a coiled bar material with a diameter of 6 mm (multiple products were produced at a time); the coiled bar material was kept at 300° C. for 10 h in a vacuum annealing furnace and then cooled with the furnace, and then subjected to hot continuous rolling by skew rolling, such that the coiled bar material with a diameter of 6 mm was rolled into a thick wire blank with a diameter of 3.6 mm; the thick wire blank was subjected to solution heat treatment (keeping at 420° C. for 2 h and quenching with water), multiple stretching treatments, intermediate annealing (keeping at 300° C. for 15 h and cooling in a furnace), and multiple continuous stretching treatments with a continuous wire stretching machine at a compression ratio of 6% to 8% to obtain a high-strength 7055Al—Zn—Mg—Cu aluminum alloy wire with a diameter of 0.8 mm to 1.6 mm.

Example 2

[0023] 7075 aluminum alloy was subjected to smelting and spray forming to obtain a blank with a diameter of 220 mm; then the blank was subjected to semi-solid upset forging at 575° C. to obtain an ingot with a diameter of 228 mm; the ingot was subjected to hot extrusion at 460° C. and an extrusion ratio of 52:1 to obtain a coiled bar material with a diameter of 10 mm (multiple products were produced at a time); the coiled bar material was kept at 200° C. for 24 h in a vacuum annealing furnace and then cooled with the furnace, and then subjected to hot continuous rolling, such that the coiled bar material with a diameter of 10 mm was rolled into a thick wire blank with a diameter of 3.4 mm; the thick wire blank was subjected to solution heat treatment (keeping at 570° C. for 2 h and quenching with water), multiple stretching treatments, intermediate annealing (keeping at 400° C. for 10 h and cooling in a furnace), and multiple continuous stretching treatments with a continuous wire stretching machine at a compression ratio of 6% to 10% to obtain a high-strength 7075Al—Zn—Mg—Cu aluminum alloy wire with a diameter of 0.8 mm to 1.6 mm.

Example 3

[0024] High-zinc Al—12Zn—2.4Mg—1.1Cu aluminum alloy was subjected to smelting and spray forming to obtain a blank with a diameter of 220 mm; then the blank was subjected to semi-solid upset forging at 500° C. to obtain an ingot with a diameter of 90 mm; the ingot was subjected to hot extrusion at 480° C. and an extrusion ratio of 20:1 to obtain a coiled bar material with a diameter of 6 mm (multiple products were produced at a time); the coiled bar material was kept at 250° C. for 20 h in a vacuum annealing furnace and then cooled with the furnace, and then subjected to hot continuous rolling, such that the coiled bar material with a diameter of 5 mm was rolled into a thick wire blank with a diameter of 3.6 mm; the thick wire blank was subjected to solution heat treatment (keeping at 500° C. for 2 h and quenching with water), multiple stretching treatments, intermediate annealing (keeping at 200° C. for 24 h and cooling in a furnace), and multiple continuous stretching treatments with a continuous wire stretching machine at a compression ratio of 15% to 20% to obtain a high-zinc Al—12Zn—2.4Mg—1.1Cu aluminum alloy wire with a diameter of 0.8 mm to 1.6 mm.

TABLE-US-00001 Table 1: Properties of the high-strength Al-Zn-Mg-Cu aluminum alloy wires in the examples of the present disclosure Example No. 1 2 3 Material name 7055 7075 Al-12Zn-2.4Mg-1.1Cu Wire specification Φ0.8 mm Φ1.2 mm Φ1.6 mm Φ0.8 mm Φ1.2 mm Φ1.6 mm Φ0.8 mm Φ1.2 mm Φ1.6 mm Yield 350 363 353 378 432 417 368 371 354 strength/MPa Tensile 420 412 386 480 456 432 482 464 412 strength/MPa Elongation/% 16 15 20 8 12 14 8 12 14 Elastic 72 72 72 70 70 70 69 69 69 modulus/GPa Hardness/HB 103 96 90 120 116 106 125 114 101 Density/g/cm.sup.3 2.7 2.7 2.7 2.8 2.8 2.8 2.9 2.9 2.9

TABLE-US-00002 TABLE 2 Room temperature tensile mechanical properties of welding parts of the high-strength Al-Zn-Mg-Cu aluminum alloy wires in the examples of the present disclosure Specified plastic Tensile extension Example strength, strength, R.sub.r0.2 Elongation at break No. Sample name Rm (MPa) (MPa) A(%) 1 7055ϕ1.2 wire welding part (T6 heat 667 575 11.5 treatment) 656 565 12.5 7055ϕ1.2 wire welding part (no heat 430 283  7.5 treatment) — — — 2 7075ϕ1.2 wire welding part (T6 heat 655 565 12.5 treatment) 634 562 12.0 7075ϕ1.2 wire welding part (no heat 388 294 10.0 treatment) — — — 3 Al12Zn2.4Mg1.1Cuϕ1.2 wire welding 695 612 12.5 part (T6 heat treatment) 689 606 13.0 Al12Zn2.4Mg1.1Cuϕ1.2 wire welding 416 308  9.5 part (no heat treatment) — — — Note: The room temperature tensile mechanical properties of the welding parts were tested as follows: The welding wire manufactured in each example was used to weld base metal aluminum alloys with the same composition as the welding wire. Some test samples were subjected to T6 heat treatment, and some test samples were subjected to no heat treatment (for example, the 7055ϕ1.2 wire welding part (T6 heat treatment) refers to a test sample obtained by welding 7055 base metals with the 7055 wire with a diameter of 1.2 mm manufactured in Example 1 and subjecting a welded product to T6 heat treatment). In accordance with Metal Material Tensile Experiment Part 1 in GB/T228.1-2010: Room Temperature Tensile Method, a mechanical performance test was conducted, where two replicates were set for each heat-treated sample.

[0025] The specific implementations of the present disclosure are described in detail above, but the present disclosure is not limited to the above-mentioned implementations. Various changes can be made within the scope of knowledge possessed by those of ordinary skill in the art.