Al-Mg-Si-Cu-Ti-Sr alloy and method for making same

Abstract

The invention provides a Al-Mg-Si-Cu-Ti-Sr alloy for preparing car body plate. The alloy consists of Al, Mg, Si, Cu, Mn, Ti, and Sr, and the contents of the components (by weight) are as follows: Mg: 1.0-1.5%, S: 1.0-1.5%, Cu: 0.5-1.0%, Mn: 0.1-0.6%, Ti: 0.1-0.3%, Sr: 0.01-0.1%, Al: the rest. The invention also provides the preparing method, characterized by preparing Al-Si-Ti alloy and other required elements by direct electrolytic method. The alloy plate provided by the invention has improved mechanical property and shaping property.

Description

[0001] Field

[0002] The invention belongs to the technical field of Al-Mg-Si-based alloy materials, and in particular relates to Al-Mg-Si-Cu-Ti-Sr alloy and a preparation method thereof. Background technique:

[0003] At present, the commonly used aluminum alloys for body panels mainly include Al-Cu-Mg-based (2000 series), Al-Mg-based (5000 series) and Al-Mg-Si-based (6000 series) alloys. Among them, 2000 series and 6000 series are alloys that can be strengthened by heat treatment, and series 5000 are alloys that cannot be strengthened by heat treatment. The 2000 series Al-Cu-Mg alloy has good forgeability, high strength and good welding performance, but its corrosion resistance is poor. The 5000 series Al-Mg base alloy has good strength, formability and corrosion resistance, but its casting performance is poor, and it has delayed yield, and it is an alloy that cannot be strengthened by heat treatment. The 6000-series Al-Mg-Si alloy has suitable strength and formability, a...