High-strength 6xxx aluminum alloys and methods of making same

A technology of aluminum alloy and casting aluminum alloy, applied in the field of 6XXX aluminum alloy, can solve problems such as edge cracking and hot tearing

Inactive Publication Date: 2018-06-08
NOVELIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, identifying the processing conditions and alloy composition that would provide such an alloy has proven to be a challenge
Additional

Method used

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  • High-strength 6xxx aluminum alloys and methods of making same
  • High-strength 6xxx aluminum alloys and methods of making same
  • High-strength 6xxx aluminum alloys and methods of making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0237] Example 1: Properties of Aluminum Alloys TB1, TB2, TB3, and TB4

[0238] A set of four exemplary aluminum alloys was prepared: TB1, TB2, TB3, and TB4 (Table 16).

[0239] Table 16: Composition of TB1-TB4 alloys (weight %)

[0240]

[0241]

[0242] The alloy was prepared by casting composition DC into an ingot and homogenizing the ingot at 520°C to 580°C for 1 hour to 5 hours. The homogenized ingot was then laid and hot rolled with an inlet temperature in the range of 500°C to 540°C and a hot roll outlet temperature in the range of 250°C to 380°C. A solution heat treatment step is then performed at 540°C to 580°C for 15 minutes to 2 hours, followed by room temperature quenching with water and natural aging to achieve the T4 temper. The T6 temper is achieved by aging the T4 alloy at 180°C to 225°C for 15 minutes to 8 hours.

[0243] The properties of the TB1-TB4 alloys were determined using testing procedures routine in the art and compared to control alloys AA6...

Embodiment 2

[0247] Example 2: Effect of Annealing

[0248] This example compares the properties of a TB1 alloy annealed in the T4 temper with a control TB1 alloy produced by a similar process without the annealing step.

[0249] The composition of the TB1 alloy is as described above in Table 16. Similar to Example 1, the initial processing for these two samples included conventional DC casting; homogenization at a heating rate of 10° / C-100° / C and soaking at a peak metal temperature of 520°C-580°C1 hours to 5 hours; and hot rolling, wherein the inlet temperature ranges from 500°C to 540°C and the hot roll outlet temperature ranges from 250°C to 380°C. Plate / sheet in the as-rolled condition is marked as being in the F temper.

[0250] For the control alloys, the plate / sheet in the F temper was then converted to the T4 temper by solutionizing at 540°C-580°C for a soaking time of 15 minutes to 2 hours, followed by water quenching and natural aging. The control was converted directly from t...

Embodiment 3

[0254] Example 3: Properties of aluminum alloys P7, P8, and P14 at different SHTs

[0255] A set of three exemplary aluminum alloys were prepared: P7, P8, and P14 (Table 18).

[0256] Table 18: Composition (weight %) of P7, P8, and P14 alloys

[0257] alloy

Cr

Cu

Fe

Mg

mn

Si

Zn

Ti

P7

0.03

0.66

0.16

1.16

0.17

1.19

0.005

0.02

P8

0.03

0.80

0.18

1.11

0.19

0.97

0.005

0.02

P14

0.03

0.61

0.18

1.20

0.18

1.09

0.004

0.02

[0258] Alloys were prepared according to the procedure of Example 1, except that the solution heat treatment soaking step was performed for a shorter time (45 seconds or 120 seconds).

[0259] The maximum elongation (in the T4 temper) and yield strength (in the T6 temper) of the P7, P8, and P14 alloys were determined using testing procedures routine in the art ( Image 6 ). Subsequent experiments were performed using different SHT c...

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Abstract

The present invention discloses high-strength aluminum alloys and methods of making and processing such alloys. More particularly, the present invention discloses a 6XXX series aluminum alloy exhibiting improved mechanical strength, formability, corrosion resistance, and anodized qualities. An exemplary method includes homogenizing, hot rolling, solutionizing, and quenching. In some cases, the processing steps can further include annealing and/or cold rolling.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 269,385, filed December 18, 2015, which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to a high-strength aluminum alloy and its preparation and processing method. The present invention also relates to 6XXX aluminum alloys exhibiting enhanced mechanical strength, formability, corrosion resistance, and anodizing quality. Background technique [0004] Recyclable aluminum alloys with high strength are desirable for enhanced product performance in many applications, including transportation (including but not limited to, e.g., trucks, trailers, trains, and ships) applications, electronics applications, and automotive applications. For example, high-strength aluminum alloys in trucks or trailers will be lighter than conventional steel alloys, providing the significant emissions reductions n...

Claims

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Application Information

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IPC IPC(8): C22C21/06C22C21/08C22C21/14C22C21/16C22F1/043C22F1/047C22F1/05C22F1/057
CPCC22C1/026C22C21/00C22F1/04C22F1/002C22C21/06C22F1/05B22D7/005C22C21/08C22C21/02C22C21/18C22C21/16C22C21/14C22F1/043C22F1/047C22F1/057
Inventor W.温H.艾哈迈德R.G.卡马特C.巴希G.弗罗里C.贝真孔J.蒂姆D.利夫拉斯A.德斯波瓦S.K.达斯
Owner NOVELIS INC
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