Heat Treatment of Nonferrous Metals - Mechanical Process Midterms

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What is the primary reason for annealing aluminum alloys during prolonged forming operations?

To avoid cracking

What is the purpose of solution heat treatment for magnesium alloy castings?

To improve tensile strength, ductility, and shock resistance

What is the significance of the symbol –T4 in the alloy designation of magnesium alloy castings?

It indicates solution heat treatment

Why should aluminum alloys not be used in the annealed state for parts or fittings?

Because they are not suitable for use in that condition Signup and view all the answers

What happens to magnesium alloy castings when allowed to age naturally at room temperatures?

They develop a negligible change in their properties Signup and view all the answers

What is the result of prolonged forming operations on aluminum alloys?

They develop mechanical hardness and resist further working Signup and view all the answers

What is the difference between solution heat treatment and precipitation heat treatment in aluminum alloys?

Solution heat treatment involves heating the alloy to a high temperature, followed by rapid cooling, whereas precipitation heat treatment involves heating the alloy to a lower temperature to allow precipitation of particles that strengthen the alloy. Signup and view all the answers

What is the purpose of aging at room temperature for some aluminum alloys, such as 2017 and 2024?

To allow the alloy to develop its full properties after solution heat treatment. Signup and view all the answers

What is the primary purpose of the pure aluminum coating in Alclad aluminum sheets?

To prevent contact with corrosive agents and to provide electrolytic protection to the core alloy. Signup and view all the answers

What is the significance of the symbol 'T' in the temper designation of an aluminum alloy?

It indicates that the alloy has been treated to produce a stable temper other than F, O, or H. Signup and view all the answers

What is the difference between the T3 and T4 tempers in an aluminum alloy?

T3 is solution heat treated and then cold worked, whereas T4 is only solution heat treated. Signup and view all the answers

What is the primary purpose of heat treatment in metals and alloys?

To alter the microstructure of metals and alloys to impart properties such as increased surface hardness, temperature resistance, ductility, and strength. Signup and view all the answers

What is the designation for the soft or annealed condition of aluminum alloys?

O Signup and view all the answers

What is the purpose of stabilization in the T7 temper of an aluminum alloy?

To prevent further aging or precipitation of particles that could lead to a decrease in properties. Signup and view all the answers

What does the T6 designation indicate about an aluminum alloy?

The alloy is in the heat-treated, hardened condition. Signup and view all the answers

What is the result of cold working on aluminum and its alloys?

They become stronger and harder. Signup and view all the answers

What is the difference between the T4 and W designations for aluminum alloys?

Both indicate solution heat treated and quenched, but not aged. Signup and view all the answers

Why are some aluminum alloys not suitable for structural aircraft parts?

They are relatively low in strength and do not have the required properties. Signup and view all the answers