Problem 10 Why must rivets of a 2017 alumin... [FREE SOLUTION]

Chapter 11: Problem 10

Why must rivets of a 2017 aluminum alloy be refrigerated before they are used?

Short Answer

Expert verified

Answer: Refrigerating rivets made of 2017 aluminum alloy before use is necessary to maintain their ductile properties during the riveting process. This prevents premature hardening, ensuring a stronger bond and enhancing the fatigue resistance and overall strength of the final structure.

Step by step solution

Understanding 2017 Aluminum Alloy

2017 Aluminum Alloy is an age-hardening alloy, which means that its strength and hardness can be increased by applying heat treatment followed by a controlled cooling process. The alloy consists of copper, magnesium, and silicon as the main alloying elements, giving it high strength, good fatigue resistance, and excellent machinability.

Importance of Refrigeration

Refrigeration is a controlled cooling process that slows down the natural aging process of the alloy. Refrigerating the rivets before usage prevents the premature hardening of the rivets, which would make them brittle and more likely to break during the riveting process.

Riveting with 2017 Aluminum Alloy

When the refrigerated rivets are used, they are still in their relatively soft and ductile state. They are inserted into the pre-drilled holes and then heated during the riveting process, which causes them to expand and fill any gaps, creating a strong mechanical bond. After riveting, the rivets cool down and undergo the age-hardening process, increasing their strength and further securing the joint.

Conclusion

Thus, it is necessary to refrigerate the rivets made of 2017 aluminum alloy before use in order to maintain their ductile properties during the riveting process. This ensures a stronger bond and enhances the fatigue resistance and overall strength of the final structure.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Age-Hardening Process

The age-hardening process, also known as precipitation hardening, is a heat treatment technique used to enhance the strength and toughness of materials. Specifically, for alloys like 2017 aluminum, this process involves three main steps:

Solution Treating: The alloy is heated to a certain temperature, allowing the alloying elements to dissolve into the aluminum matrix.
Quenching: The material is rapidly cooled to trap the dissolved elements, forming a supersaturated solid solution.
Aging: The alloy is either naturally or artificially aged by reheating or leaving it at room temperature, respectively. This allows for the precipitates to form, which hinder dislocation movement and increase the material's strength.

For 2017 aluminum alloy rivets, refrigeration delays the natural aging process, keeping the rivets in a workable state until they're needed for riveting.

Alloying Elements

Alloying elements are added to metals to improve their properties. In the context of 2017 aluminum alloy, elements like copper, magnesium, and silicon play key roles.

Copper: Increases the alloy's strength and resistance to deformation but may reduce its corrosion resistance.
Magnesium: Contributes to the strength and improves the machinability of the alloy.
Silicon: Enhances the alloy's fluidity during processing, providing better casting properties.

These elements combine to make 2017 aluminum alloy a popular choice in applications requiring high tensile strength, like aircraft and automotive parts.

Mechanical Properties

The mechanical properties of an alloy dictate how it behaves under various physical forces. For 2017 aluminum alloy, these properties are specifically tailored to meet demanding applications' needs.

High Tensile Strength: Makes it suitable for high-stress environments.
Good Fatigue resistance: Allows it to withstand cyclic loading without cracking or failing.
Excellent Machinability: Enables precise and efficient manufacturing processes.

The age-hardening process enhances these mechanical properties, making the material more robust and reliable for structural applications.

Refrigeration Process

The refrigeration process is critical for managing the mechanical properties of 2017 aluminum alloy rivets before they are used. Refrigeration involves cooling the alloy to slow down or halt the natural aging process.

Purpose: Prevents premature hardening by keeping the rivets soft and malleable, ensuring ease of use during installation.
Result: Provides sufficient time for handling and positioning the rivets without the risk of them becoming too brittle or hard to work with.
Benefit: Ensures the rivets only harden after they are in place and secured, which happens through the age-hardening process during use.

This ensures that the rivets create strong, reliable bonds once installed, maintaining the integrity and longevity of the structure.

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Why must rivets of a 2017 aluminum alloy be refrigerated before they are used?

Short Answer

Step by step solution

Understanding 2017 Aluminum Alloy

Importance of Refrigeration

Riveting with 2017 Aluminum Alloy

Conclusion

Key Concepts

Age-Hardening Process

Alloying Elements

Mechanical Properties

Refrigeration Process

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