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Aluminum alloy material with high bake hardening capability for 6-series automobile bodies

A technology of aluminum alloy material and automobile body, which is applied in the field of 6 series aluminum alloy and 6xxx series high bake hardenable aluminum alloy material for automobile body, which can solve the problems of high Cu content, low bake hardenability and high yield strength

Inactive Publication Date: 2011-03-16
苏州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The AA6111 alloy has good bake hardenability, but its yield strength before stamping is relatively high (usually exceeding 150MPa or even higher), resulting in reduced formability of the material and poor flanging ductility, making it difficult to fully meet the formability requirements of automobile body panels
At the same time, the Cu content of the alloy is high, which reduces the corrosion resistance of the material.
6016 and 6022 alloys are low-Cu alloys with good formability, but their bake hardenability is lower than that of 6111 alloys.

Method used

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  • Aluminum alloy material with high bake hardening capability for 6-series automobile bodies

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Experimental program
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Embodiment 1

[0021] The composition of the aluminum alloy is calculated by mass percentage: Si 0.50wt%, Mg 0.60wt%, Mn 0.20wt%, Fe 0.05wt%, Cu 0.30wt%, Ti 0.15wt%, Cr 0.10wt%, and the balance is Al. After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1mm; the thin plate is water-quenched after solution treatment, and after two weeks of natural aging, it is simulated stamping and baked (2% pre-deformation + 175℃×30min) .

Embodiment 2

[0023] The composition of the aluminum alloy is calculated by mass percentage: Si 0.60wt%, Mg 1.30wt%, Mn 0.18wt%, Fe 0.25wt%, Cu 0.01wt%, Ti 0.10wt%, Cr 0.08wt%, and the balance is Al. After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1mm; the thin plate is water-quenched after solution treatment, and after two weeks of natural aging, it is simulated stamping and baked (2% pre-deformation + 175℃×30min) .

Embodiment 3

[0025] The composition of the aluminum alloy is calculated by mass percentage: Si 1.00wt%, Mg 0.60wt%, Mn 0.05wt%, Fe 0.05wt%, Cu 0.20wt%, Ti 0.15wt%, Cr 0.10wt%, and the balance is Al. After the aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1mm; the thin plate is water-quenched after solution treatment, and after two weeks of natural aging, it is simulated stamping and baked (2% pre-deformation + 175℃×30min) .

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Abstract

The invention provides an aluminum alloy material with high bake hardening capability for 6-series automobile bodies, which comprises the following components: 0.50-1.00wt% of Si, 0.60-1.30wt% of Mg, 0.01-0.30wt% of Cu, 0.05-0.20wt% of Mn, less than or equal to 0.10wt% of Cr, less than or equal to 0.15wt% of Ti, 0.05-0.25wt% of Fe and the balance of Al. After the material is formed by casting, the material is treated by homogenizing annealing, hot rolling, cold rolling, solution treatment and then natural aging. Before stamping, the yield strength of the material is lower than 130MPa; and after baking, the yield strength of the material is greater than 230MPa, and the tensile strength of the material is greater than 310MPa. The material has higher bake hardening ability, and simultaneously, the forming property of the material meets the using requirements, thus the material is an ideal material for manufacturing automobile bodies.

Description

technical field [0001] The invention relates to a 6-series aluminum alloy, in particular to a high-bake-hardenability aluminum alloy material for a 6xxx series automobile body with high bake-hardenability, and belongs to the technical field of aluminum alloys. Background technique [0002] The lightweight of automobiles is one of the development directions of automobiles, and the aluminum alloying of automobiles is an important means of lightweighting. In recent years, the development of aluminum alloy panels for automobile bodies has been the focus of research at home and abroad, mainly focusing on the three series of 2xxx series, 5xxx series and 6xxx series. But the current development trend is to develop aluminum alloys for 6xxx series body panels. [0003] This series of alloys is usually supplied in T4 (solution quenching + natural aging) or T4P (solution quenching + pre-aging) state. It is generally required that the material has a low yield strength, high work harde...

Claims

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Application Information

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IPC IPC(8): C22C21/08
Inventor 纪艳丽钟皓胡平郭富安
Owner 苏州有色金属研究院有限公司
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