6061 and 7075 belong to the same aluminum alloy, the performance is similar, but the difference is great, 6061 is classified as 6000 series aluminum alloy, while 7075 is classified as 7000 series aluminum alloy.
6061: In 6061 aluminum alloy, the aluminum alloy element accounts for 97.9%, magnesium element accounts for 1%, silicon element accounts for 0.6%, and 0.28% copper and 0.2% chromium are added.
7075: In 7075 aluminum alloy, the main metal elements of aluminum and zinc account for 90% and 5.6% respectively, while the other elements of magnesium account for 2.5%, copper accounts for 1.6%, chromium accounts for 0.23% and the remaining elements of silicon, manganese, titanium...etc.

Strength measurement data of 6061 and 7075 aluminum alloys
Aluminum Alloy Yield Shear Tension
Designation (Yield) (Shear) (Tensile)
6065 7KSI 10KSI 13KSI
7075 15KSI 22KSI 33KSI
In the table, we can clearly see that 7075 is significantly higher than 6061 aluminum alloy in all aspects of measurement data, and this is mainly because the content of aluminum alloy in 7075 aluminum alloy is nearly 8% less than the aluminum contained in 6061 (6061 contains 97.9% of aluminum, while 7075 contains 90% of aluminum). Because, pure aluminum is a very soft metal element.
The toughness of the metal (Temper) using an alloy can change the properties of the metal itself, making it into another material with completely different physical properties. In addition to alloying, another way to improve the overall strength of the metal is the so-called "heat treatment". We often hear "quenching" is a kind of "heat treatment", it is to let the metal through the high temperature heating, and then rapid cooling way to increase its strength.
6061, 7075 state analysis.
And generally used to describe the characteristics of the metal after "heat treatment", is the so-called "toughness (Temper)". The general way to describe the "toughness" of metals is to use different alphabetical abbreviations to indicate. Here we list several common letters for your reference.
F: indicates that the metal is not subjected to special treatment after processing (including: cold working, hot working or casting).
O: indicates that the metal then undergoes the "Annealed" process to the minimum required strength level. The general purpose of "annealing" is to make the work-hardened parts soften again and return to the required toughness in order to increase the ductility and stability of the material, and facilitate further processing.
W: refers to the use of "Solution Treatment" and "Natural Aging" to achieve the purpose of metal hardening. This heat treatment method is generally used for 7XXX series aluminum alloys to improve their hardness.
H: indicates the finished product after processing deformation, which is a way to improve the strength of the material itself without additional heat treatment.
T: A heat treatment method that can strengthen the toughness of the material more than the above "F", "O" or "H".
Generally, the letter "T" is followed by one or more numbers. Such as we often hear the "T6" is one of them.

Solution heat treatment" and "natural aging" mentioned above are one kind of hardening heat treatment, while the general practical precipitation hardening heat treatment procedures usually include: solution heat treatment, quenching and aging treatment (Aging Treatment) Three kinds of steps. The so-called "solution heat treatment" refers to the process of completely heating up the material in the alloy until the metal melts, so that all the solutes are dissolved together; while "quenching" refers to the "solution heat treatment after "quenching" is the process of rapidly cooling the material to obtain a greater hardness. The "aging treatment" will be "quenched" after the object, placed at a constant temperature, so that its internal structure gradually change, and produce detailed precipitates, and cause changes in nature. If this constant temperature is at room temperature, it is called "natural aging"; if it is in a high temperature furnace, it is called "artificial aging".
In all applications of R/C models, we often see aluminum alloys with "T6" heat treatment. If the heat-treated aluminum alloy is "T6061-T6", it can even make the original 6061 material have higher "yield" and "tension" than the 7075 aluminum alloy. Tension" (refer to the table below), but in terms of "shear force", it is even lower than 7075. Therefore, after adopting "T6" heat treatment, the "yield force" and "tension" of aluminum alloy can be greatly increased, but the increase in "shear force" is relatively small. "This heat treatment technology is also applicable to 6061 and 7075 materials.
Aluminum alloy code Yield Shear Tensile
6061 7KSI 10KSI 13KSI
7075 15KSI 22KSI 33KSI
6061-T6 31KSI 17KSI 35KSI
7075--T6 73KSI 48KSI 83KSI
The above table shows the data of various strength measures obtained after applying the "T6" grade heat treatment.

IV. Further understanding of 7075-T6
In the above, we have explained the strength measurement data obtained by using "T6" grade heat treatment for 6061 aluminum alloy, but what is the amazing performance for 7075 with "T6" grade heat treatment?
As shown in Table 3 above, for 7075 - T6, the "yield force" is increased to nearly five times the original non-heat treatment (15KSI → 73KSI), while the "tension The "tension" also increased by about two and a half times (33KSI→83KSI), and more surprisingly in the "shear" area. For 6061-T6, only 7KSI (10KSI → 17KSI), 70% of the original; while in 7075-T6, it is from 22KSI to 48KSI, a full increase of more than two times.
Five, 6061, 7075 price difference.
The sales volume and usage rate of 6061 in the market is relatively high compared to 7075. Usually 6061 is the highest selling aluminum alloy material in aluminum alloy, because its performance basically matches various mechanical processing, equipment processing and other industrial uses, it has been a household name of an aluminum alloy grade, and has been well received by the majority of manufacturers in the traditional use, so it is already a habit to choose 6061 as raw material. Therefore, it is a habit to choose 6061 as the raw material. Also, the production and processing cost of 6061 is relatively low, so the supply and use of 6061 is relatively huge.





 

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