Al-Zn-Mg-Cu-Mn aluminum alloy and preparation process thereof

Abstract

The invention discloses Al-Zn-Mg-Cu-Mn aluminum alloy and a preparation process thereof. The Al-Zn-Mg-Cu-Mn aluminum alloy is prepared from the following components according to weight percent: 5.5 wt% to 6.6 wt% of Zn, 0.35 wt% to 0.55 wt% of Mg, 0.15 wt% to 0.25 wt% of Cu, 0.1 wt% to 0.19 wt% of Mn, 0.1 wt% to 0.2 wt% of Zr, 0.05 wt% to 0.2 wt% of Cr, less than 0.05 wt% of Ti, less than 0.15 wt%of Si, less than 0.25 wt% of Fe and the balance of Al. The preparation process of the Al-Zn-Mg-Cu-Mn aluminum alloy comprises the steps of melting the components of the Al-Zn-Mg-Cu-Mn aluminum alloyand casting into an aluminum alloy casting first, then uniformly heating the aluminum alloy casting so as to form an aluminum alloy rod, cutting the aluminum alloy rod into aluminum alloy casting rods, heating again so as to soften the aluminum alloy casting rods, extruding the softened aluminum alloy casting rods so as to form aluminum alloy extruded bodies, and finally, performing online coolingstraightening and cutting and standing treatment on the aluminum alloy extruded bodies in sequence, so that the Al-Zn-Mg-Cu-Mn aluminum alloy is obtained.

Description

technical field [0001] The invention relates to the field of aluminum alloys, in particular to an Al-Zn-Mg-Cu-Mn series aluminum alloy and a preparation process thereof. Background technique [0002] The automobile industry is a pillar industry of the national economy, but the energy and environmental constraints faced by its rapid development have become increasingly prominent. Body weight reduction is the most effective and significant method for automobiles to save energy and reduce emissions. Especially for new energy vehicles, the demand for body weight reduction is more urgent. Using aluminum alloys instead of copper or steel is one of the important ways to reduce the weight of automobiles. [0003] Aluminum alloys are widely used in the manufacturing and processing of automotive structural parts due to their suitable strength and processing properties. In order to obtain sufficient strength, the existing aluminum alloys must go through two processes of quenching and a...

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Problems solved by technology

[0004] The embodiment of the present invention provides an Al-Zn-Mg-Cu-Mn series aluminum alloy and its preparation process to solve the problem of product size change caused by rapid cooling after quenching of current aluminum alloys and the problem of product strength reduction caused by welding processes

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