Structural Automotive Part Made From an Al-Zn-Mg-Cu Alloy Product and Method of its Manufacture
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United States of America Patent
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Nov 14, 2013
filing date -
Jun 12, 2009
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Abstract
A method of manufacturing a formed aluminium alloy body-in-white (“BIW”) part of a motor vehicle, the BIW part having a yield strength of more than 500 MPa after being subjected to a paint-bake cycle. The method includes providing a rolled aluminium sheet product of an AlZnMgCu alloy and having a gauge in a range of 0.5 to 4 mm and subjected to a solution heat treatment (SHT) and quenched following SHT, and wherein the SHT and quenched aluminium sheet product has a substantially recrystallized microstructure, forming the aluminium alloy sheet to obtain a formed BIW part, assembling the formed BIW part with one or more other metal parts to form an assembly forming a motor vehicle component, subjecting the motor vehicle component to a paint bake cycle, wherein the aluminium alloy sheet in the formed BIW part has a yield strength of more than 500 MPa.
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