| 1. | A process is known to follow the Arrhenius relationship,
and a rough test shows that, at temperatures near the room temperature,
its rate is roughly doubled for every 10 ? rise.
What is its approximate activation energy?
|
| 2. | Write down the equation and appropriate boundary conditions that describe the diffusion of hydrogen inside a container at high temperature, into the "thick" steel wall of the container. |
| 3. | Copper has a cubic crystal structure and the
slip systems {111} <110>. Draw the unit cell, a slip plane and
its associated slip directions. How many independent slip systems are there
in total?
|
| 4. | Two fairly common types of 2-dimension crystallographical
defects are the twin boundary. Using square grids to represent the crystal
lattice, sketch an example of each.
|
| 5. | Use the Griffith crack model to explain why
a glass plate can support a heavy load, when the glass sits on top of a
flat surface, but breaks if it is placed on an uneven surface.
|
END