Aluminum 6061 T6 vs T651: Understanding the Differences

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Aluminum 6061 is one of the most commonly used alloys in the construction and manufacturing industries. It is a versatile material that offers excellent strength, corrosion resistance, and machinability. Two popular tempers of aluminum 6061 are T6 and T651. While they may seem similar, there are important differences between the two that are worth understanding.

In this article, we will explore the differences between Aluminum 6061 T6 and T651, including their properties, uses, and how to choose the right temper for your application.

Aluminum 6061 T6:

Aluminum 6061 T6 is the most commonly used temper of the 6061 alloy. The “T6” designation means that it has been solution heat-treated and artificially aged. This process involves heating the alloy to a high temperature, then rapidly cooling it to lock in the desired properties.

One of the key characteristics of Aluminum 6061 T6 is its high tensile strength. It has a minimum tensile strength of 42,000 psi and a yield strength of 35,000 psi. This makes it suitable for applications where strength is important, such as structural components, aerospace parts, and automotive parts.

In addition to its strength, Aluminum 6061 T6 also offers good machinability. It can be easily welded, machined, and formed into complex shapes. This versatility makes it a popular choice for a wide range of applications.

Aluminum 6061 T651:

Aluminum 6061 T651 is similar to T6 in that it has been solution heat-treated and artificially aged. The key difference is that T651 has been stretched to eliminate internal stresses. This stretching process can improve the material’s dimensional stability and reduce the risk of warping during machining or welding.

One of the main advantages of Aluminum 6061 T651 is its improved flatness and stability. This makes it well-suited for applications where tight tolerances are required, such as precision components or parts that will be subjected to thermal cycling.

In terms of mechanical properties, Aluminum 6061 T651 is similar to T6. It has a minimum tensile strength of 42,000 psi and a yield strength of 35,000 psi. However, the stretching process can improve the material’s fatigue resistance and elongation, making it a better choice for certain high-stress applications.

Choosing the Right Temper:

When deciding between Aluminum 6061 T6 and T651, it’s important to consider the specific requirements of your application. If you need a material with high strength and good machinability, T6 may be the better choice. On the other hand, if dimensional stability and flatness are critical, T651 may be more suitable.

It’s also worth considering the processing requirements of each temper. T651 may be more expensive due to the additional stretching process, so it’s important to weigh the cost against the benefits it offers.

In conclusion, Aluminum 6061 T6 and T651 are two popular tempers of the 6061 alloy, each with its own unique properties and advantages. Understanding the differences between the two can help you choose the right temper for your application and ensure that your project is a success.
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