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Questions and Answers
What does the letter 'T' indicate in the designation of aluminum alloys?
What does the letter 'T' indicate in the designation of aluminum alloys?
- The degree of work hardening
- The type and degree of heat treatment (correct)
- The annealed condition
- The type of wrought aluminum
What does the letter 'O' indicate in the designation of aluminum alloys?
What does the letter 'O' indicate in the designation of aluminum alloys?
- The type of wrought aluminum
- The degree of heat treatment
- The type of cast aluminum
- The soft or annealed condition (correct)
What is the temper designation system used for?
What is the temper designation system used for?
- Only for wrought aluminum
- All forms of wrought and cast aluminum and aluminum alloys except ingot (correct)
- Only for heat-treatable alloys
- Only for cast aluminum
What does the letter 'H' indicate in the designation of aluminum alloys?
What does the letter 'H' indicate in the designation of aluminum alloys?
What is the purpose of the temper designation system?
What is the purpose of the temper designation system?
What is cold-working?
What is cold-working?
What happens to metals when they undergo cold-working?
What happens to metals when they undergo cold-working?
At what temperature do cold-working processes occur?
At what temperature do cold-working processes occur?
What is the result of shaping metals through cold-working?
What is the result of shaping metals through cold-working?
What is the purpose of cold-working?
What is the purpose of cold-working?
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Study Notes
Temper in Aluminum Alloys
- The temper, or hardness value, is an important factor in aluminum alloys.
- Heat-treatable alloys have a 'T' in their designation, followed by a number indicating the type and degree of heat treatment.
Non-Heat-Treatable Alloys
- Non-heat-treatable alloys have an 'O' in their designation, indicating a soft or annealed condition.
- Alternatively, they may have an 'H' and a number, indicating the degree of work hardening.
Temper Designation System
- The temper designation system is used for all forms of wrought and cast aluminum and aluminum alloys, excluding ingot.
- The system is based on the sequence of basic treatments used to produce the various tempers.
Cold Working
- Cold working is a process that alters the shape of an alloy at room temperature through stretching, compression, bending, drawing, or other means.
- Cold working occurs at or near atmospheric pressure, resulting in strain hardening of the metal.
- No heat is involved in the cold working process, as it takes place at room temperature.
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