Aluminium alloy capable of inhibiting formation of large crystal grains

Abstract

The invention relates to an aluminium alloy capable of inhibiting the formation of large crystal grains. The aluminium alloy comprises the following components in percentage by mass: 0.72% of magnesium, 1.2% of silicon, 0.25% of manganese, 0.05% of chromium, 0.35% of copper, 0.21% of iron, 0.01-0.03% of strontium, 0.005% of titanium and the balance aluminium and inevitable impurities. The aluminium alloy is capable of inhibiting the grain size growth of crystals; and inhibition for the growth phenomenon of the crystal grains is realized through a specific processing technique.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an aluminum alloy material that suppresses the formation of large grains. Background technique [0002] At this stage, aluminum alloy profiles are widely used for their light weight, high ductility, and even high strength. However, in the application of this type of material, especially in the process of casting or extrusion, the internal structure of the aluminum alloy will cause crystallization during the quenching process after forming due to a series of reasons such as large changes in compressive stress and large temperature rise. grain recrystallization. The grains in the tissue body grow excessively, forming coarse grains. This type of grain has a great influence on the mechanical properties, fatigue resistance, corrosion resistance and later processing of aluminum alloy materials. [0003] Therefore, in the field of profile processing, how to suppress large grains in the...