6061 aluminum is a better material. Because 7075 aluminum contains a high proportion of other metals, so welding, processing are more difficult, especially 7075 aluminum (the latter two digits represent the alloy ratio) it is higher proportion, so it generally can not be used as a frame material. By contrast, the 6061 aluminum plate has a lower proportion of other metals, so it can be enhanced by special-shaped, various treatments to reduce its strength and wind resistance, and can even be reduced by three suction pipes.
The main alloy elements of 6061 aluminum alloy are magnesium and silicon and form Mg2Si phase. A certain amount of manganese and chromium can neutralize the bad effect of iron; sometimes a small amount of copper or zinc can be added to improve the strength of the alloy without significantly reducing its corrosion resistance; a small amount of copper in conductive materials can counteract the bad effect of titanium and iron on conductivity; zirconium or titanium can refine the grain and control the recrystallization. In order to improve machinability, lead and bismuth can be added. In Mg2Si, the ratio of Mg to Si is 1.73. Under heat treatment, Mg2Si solidifies and melts in aluminum, which makes the alloy have the function of artificial aging hardening. 6061 industrial structure with high strength, weldability and high corrosion resistance is required. 6061 aluminum alloy sheet requires a certain strength, weldability and corrosion resistance of various industrial structures, such as manufacturing trucks, towers, ships, trams, furniture, mechanical parts, precision processing and other pipe, rods, profiles, sheets.
The main differences between 7075 and 6061 aluminum alloy plates profiles are:
1. at present, the materials commonly used for aluminum alloy frame are 7075 and 6061 aluminum alloy.
2.this series of aluminum alloys are mainly zinc alloys, with a ratio of 6%. The 6 series aluminum alloy is mainly composed of magnesium and silicon, and the proportion of total components is low.
3. In terms of strength, 7005 aluminum is stronger, but only slightly stronger. As you can see from the table, yield strength is only slightly stronger than 6061 aluminum.
4. all aluminum alloys used for frame materials are treated by heat treatment T6.