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A diffusion couple is prepared using two hypothetical metals A and B. After a 20-h heat treatment at 800°C the concentration of B in A is 2.5 wt% at the 5.0-mm position within metal A. If another heat treatment is conducted on an identical diffusion couple, but at 1200°C for 20 h, at what position will the composition be 2.5 wt% B? Diffusivity of B in A is

The number of equilibrium vacancies in a material __________ with increasing temperature

At what temperature will the diffusion coefficient for the diffusion of nickel in copper have a value of 4.0 * 10-17 m2/s? (The value of pre-exponential is 1.9*10-4 m2/s and activation energy is 230 kJ/mol)

An interstitial is

Calculate the diffusion coefficient (in m2/s) for copper in aluminum at 700

A 150 mm long cylindrical sample with a 20 mm diameter is stretched until the diameter is decreased by 0.0023 mm. What is the applied force? E = 104 GPa and v = 0.34. Assume the deformation is elastic.

Using the table below, which element is most likely to form an interstitial solid solution with Copper?

Two impurity atoms of different elements are added to a metallic element. Which is the more likely scenario?

Explain your hand and arm placement while preforming a toe nail trim while the animal is in lateral recumbency. 

After doing the Schirmer tests, you find that the right eye is producing 13mm/min In the left eye 12mm/min. You report this to the veterinarian, who then begins to visually examine the eye. How would you restrain Sparky for an eye exam?