Rapidly aged, high strength, heat treatable aluminum alloy products and methods of making the same
Described herein are methods of processing heat treatable aluminum alloys using an accelerated aging step, along with aluminum alloy products prepared according to the methods. The methods of processing the heat treatable alloys described herein provide a more efficient method for producing aluminum alloy products having the desired strength and formability properties. For example, conventional methods of processing alloys can require 24 hours of aging. The methods described herein, however, substantially reduce the aging time, often requiring eight hours or less of aging time.
1. A method of processing a rolled 7xxx series aluminum alloy product, comprising:
solutionizing a rolled 7xxx series aluminum alloy product at a solutionizing temperature of at least 400° C.;
quenching the rolled 7xxx series aluminum alloy product to produce a W temper rolled 7xxx series aluminum alloy product;
naturally aging the W temper rolled aluminum alloy product to produce an intermediate aged rolled 7xxx series aluminum alloy product for at least one day; and
artificially aging the intermediate aged rolled 7xxx series aluminum alloy product for a period of time up to 7 hours.
2. The method of claim 1 , wherein the solutionizing temperature is from at least 400° C. to 500° C.
3. The method of claim 1 , further comprising deforming the rolled aluminum alloy product at a temperature of from about 125° C. to about 500° C.
4. The method of claim 1 , wherein quenching the rolled aluminum alloy product comprises cooling the rolled aluminum alloy product at a rate of from 5° C./second to 1000° C./second.
5. The method of claim 3 , wherein quenching the rolled aluminum alloy product is performed after deforming the rolled aluminum alloy product.
6. The method of claim 1 , wherein naturally aging the W temper rolled aluminum alloy product comprises aging the W temper rolled aluminum alloy product at room temperature for up to 12 months.
7. The method of claim 1 , wherein artificially aging the intermediate aged rolled aluminum alloy product comprises a single step aging procedure.
8. The method of claim 1 , wherein artificially aging the intermediate aged rolled aluminum alloy product comprises a multiple-step aging procedure.
9. The method of claim 8 , wherein the multiple-step aging procedure comprises at least a first aging step and at least a second aging step.
10. A method of processing a rolled 7xxx series aluminum alloy product, comprising:
solutionizing a rolled 7xxx series aluminum alloy product at a solutionizing temperature of at least 400° C.;
quenching the rolled 7xxx series aluminum alloy product to produce a W temper rolled 7xxx series aluminum alloy product;
naturally aging the W temper rolled aluminum alloy product to produce an intermediate aged rolled 7xxx series aluminum alloy product for at least one day; and
artificially aging the intermediate aged rolled 7xxx series aluminum alloy product for a period of time up to 7 hours through at least two aging steps; wherein:
the first aging step comprises heating the intermediate aged rolled aluminum alloy product to a first aging temperature of from 90° C. to 135° C. and maintaining the first aging temperature for a period of time; and
the second aging step comprises heating the intermediate aged rolled aluminum alloy product to a second aging temperature of from 140° C. to 220° C. and maintaining the second aging temperature for a period of time,
wherein a total aging time of the first aging step and the second aging step is greater than 5 hours.
11. The method of claim 1 , wherein the rolled aluminum alloy product is prepared from a monolithic alloy, or wherein the rolled aluminum alloy product is prepared from a clad rolled aluminum alloy product having a core layer and at least one clad layer.