Which aluminum alloys are specifically mentioned for refrigeration after heat treatment?

The correct choice highlights aluminum alloys specifically mentioned for refrigeration after heat treatment, particularly 2017 and 2024.

Alloy 2017 is an age-hardening alloy commonly used in applications that require high strength and excellent fatigue resistance. It's known for its ability to retain these properties even at lower temperatures, making it suitable for refrigeration applications. Similarly, 2024 is recognized for its high strength-to-weight ratio and good fatigue resistance, which is often essential in aerospace and similar applications where weight savings and strength in cold conditions are crucial.

These alloys undergo heat treatment to enhance their mechanical properties, making them ideal for environments that require both thermal management and structural integrity, such as refrigeration.

The other options include alloys that may not provide the same combination of characteristics needed for refrigeration in heat-treated forms. Thus, 2017 and 2024 stand out for these specific requirements within the context of refrigeration after heat treatment.