Al-Mg-Si as-cast aluminum alloy and aging treatment process thereof
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A technology of aging treatment and pre-aging treatment, which is applied in the field of aluminum alloy heat treatment, can solve the problems of alloy performance degradation, aging treatment process is not specific and perfect, and achieve the effect of improving mechanical properties
Inactive Publication Date: 2015-11-04
GUIZHOU INST OF TECH
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[0003] The existing Al-Mg-Si series aluminum alloys with different composition content are not specific and perfect in the aging treatment process, which seriously reduces the performance of the alloy, so some Al-Mg-Si series aluminum alloys with specific composition content Research on aging treatment process is particularly necessary
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Embodiment 1）
[0015] Example 1), calculated in parts by weight, the cast aluminum alloy consists of 6-8 parts of magnesium, 4-6 parts of silicon, 60-80 parts of aluminum, 2-3.5 parts of iron, 0-1 part of copper, and 0-1 part of zinc. 1 part, 0~1 part of manganese, 0~1 part of titanium, 0~1 part of chromium are mixed, and the Al-Mg-Si series cast aluminum alloy is subjected to solid solution treatment at a temperature of 520 ° C to 530 ° C and kept for 3 hours ~4 hours, and then aged at 200°C for 4 hours to 5 hours to peak T6 state.
Embodiment 2）
[0016] Example 2), calculated in parts by weight, the cast aluminum alloy consists of 6-8 parts of magnesium, 4-6 parts of silicon, 60-80 parts of aluminum, 2-3.5 parts of iron, 0-1 part of copper, and 0-1 part of zinc. 1 part, 0~1 part of manganese, 0~1 part of titanium, 0~1 part of chromium, and solid solution treatment of Al-Mg-Si cast aluminum alloy, temperature 520℃~530℃, heat preservation for 3 hours~ 4 hours, then the first stage is aged at 140°C for 3 hours to 4 hours, and the second stage is aged at 200°C for 3 hours to 4 hours.
Embodiment 3）
[0017] Example 3), calculated in parts by weight, the cast aluminum alloy consists of 6-8 parts of magnesium, 4-6 parts of silicon, 60-80 parts of aluminum, 2-3.5 parts of iron, 0-1 part of copper, and 0-1 part of zinc. 1 part, 0~1 part of manganese, 0~1 part of titanium, 0~1 part of chromium, and solid solution treatment of Al-Mg-Si cast aluminum alloy, temperature 520℃~530℃, heat preservation for 3 hours~ 4 hours, then the first stage is aged at 150°C for 2 hours to 3 hours, and the second stage is aged at 200°C for 2 hours to 3 hours.
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Abstract
The invention discloses an Al-Mg-Si as-cast aluminum alloy and an aging treatment process thereof. The as-cast aluminum alloy is prepared from the following components in parts by weight in a mixing way: 6-8 parts of Mg, 4-6 parts of Si, 60-80 parts of Al, 2-3.5 parts of Fe, 0-1 part of Cu, 0-1 part of Zn, 0-1 part of Mn, 0-1 part of Ti and 0-1 part of Cr. The aging treatment process of the Al-Mg-Si as-cast aluminum alloy comprises the following steps: firstly performing solution treatment on the Al-Mg-Si as-cast aluminum alloy at 520-530 DEG C, performing low-temperature pre-aging treatment at 140-160 DEG C so that the aluminum alloy is in an under-aged state and the precipitated phases are mainly of solute atom aggregations, namely GP zones, and the precipitation density of the GP zones is increased a period of time after being under-aged state; and further increasing the aging temperature to 200 DEG C to perform high-temperature aging so that the number of the GP zones converted into beta' strengthening phases is increased, thereby effectively improving the mechanical property of the aluminum alloy.
Description
technical field [0001] The invention relates to an Al-Mg-Si series cast aluminum alloy and an aging treatment process thereof, belonging to the technical field of aluminum alloy heat treatment. Background technique [0002] Al-Mg-Si series aluminum alloy belongs to the deformed aluminum alloy that can be strengthened by heat treatment. It has medium strength, good thermal processing performance, thermal conductivity, polishing performance, anodic oxidation coloring performance, excellent welding performance and corrosion resistance. Used in aerospace, transportation, construction and other industries. In order to obtain the highest strength, this series of aluminum alloys is often subjected to T6 peak aging. However, with the development of my country's aerospace, transportation and other industries, it has become inevitable to lighten aluminum alloy materials, increase productivity and reduce costs. The requirements for the comprehensive performance of aluminum alloys are g...
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