Aluminum alloy sheet superior in sintering coating hardenability

Abstract

Provided is a 6000-series aluminum alloy sheet having the BH property under the low-temperature short-time condition after long-term room-temperature aging and the formability after long-term room-temperature aging. The specific 6000-series aluminum alloy sheet contains specific atom clusters which are detected by a three-dimensional atom probe field ion microscope and have great effect on the BH property, with a number density higher than a certain number density, thereby limiting the number of the small atom clusters, increasing the proportion of the large atom clusters and furthermore improving the BH property under the low-temperature short-time condition after long-term room-temperature aging.

Description

technical field [0001] The invention relates to an Al-Mg-Si series aluminum alloy plate. The aluminum alloy sheet referred to in the present invention is a rolled sheet such as a hot-rolled sheet or a cold-rolled sheet, and is an aluminum alloy sheet subjected to quenching and tempering such as solution treatment and quenching treatment, and before sintering, coating and hardening treatment. In addition, in the following description, aluminum is also called Al. Background technique [0002] In recent years, society has increasingly demanded weight reduction of vehicles such as automobiles in consideration of the global environment and the like. In order to respond to this demand, as materials for automotive panels, especially large body panels (outer panels, inner panels) such as hoods, doors, and roofs, in addition to steel materials such as steel sheets, excellent formability and sintering coating hardening properties, The use of lighter aluminum alloys is increasing. ...

AI Technical Summary

Problems solved by technology

[0022] However, for the BH properties after room temperature aging in these conventional technologies, there is still room for improvement under the condition

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