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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Age Hardening in Aluminum Alloys

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1. The Orowan stress (stress required to bypass the precipitate) is proportional to:

a: : r^(-1) Explanation

Explanation

b: r^(-3) Explanation

Explanation

c: r^(-0.5) Explanation

Explanation

d: r Explanation

Explanation

2. Choose the correct sequence for precipitation treatment of aluminium alloy:

a: Solution Treatment-->Quenching-->Aging Explanation

Explanation

b: Aging-->Quenching-->Solution Treatment Explanation

Explanation

c: Solution Treatment-->Aging-->Quenching Explanation

Explanation

d: Quenching-->Solution Treatment-->Aging Explanation

Explanation

3. How does hardness profile vary with ageing time?

a: linearly increases with ageing time Explanation

Explanation

b: first decreasing to lowest then increases Explanation

Explanation

c: first increasing to peak then decreases Explanation

Explanation

d: linearly decreases with ageing time Explanation

Explanation

4. Which test is typically used to obtain aging curve for aluminum alloys?

a: Vickers hardness test Explanation

Explanation

b: Brinell hardness test Explanation

Explanation

c: Tensile test Explanation

Explanation

d: Impact test Explanation

Explanation

5. Which of the following is incorrect?

a: Hardness is affected by size of the precipitates Explanation

Explanation

b: Hardness is not affected by the aging temperature Explanation

Explanation

c: Hardness is affected by the amount of solute in the solid solution Explanation

Explanation

d: Hardness is affected by the nature of the interface with the matrix Explanation

Explanation

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