Engineering Education

1. On a binary phase diagram, the liquidus line represents:

The temperature below which the alloy is fully solidThe temperature above which the alloy is fully liquidThe composition at the eutectic point

2. The eutectic point in a binary phase diagram is notable because it:

Has the highest melting temperature of all compositionsHas the lowest melting temperature of all compositions in the systemAlways occurs at a 50/50 composition by mass

3. A 'total solubility' (isomorphous) system means:

Components are completely immiscible in the solid stateComponents form a continuous solid solution at all compositionsOnly a limited amount of one component dissolves in the other

4. Face-Centred Cubic (FCC) crystal structure has atoms located at:

Corners onlyCorners and body centreCorners and face centres

5. In Miller index notation, the plane (110) is perpendicular to which direction?

[100][110][111]

6. FCC metals (e.g. aluminium, copper) tend to be more ductile than BCC metals because they have:

Fewer atoms per unit cellMore close-packed slip systems available for plastic deformationHigher melting points

7. In a partial solubility (eutectic) phase diagram, the two-phase solid region between α and β is called:

The liquidus regionThe α + β two-phase fieldThe peritectic region

8. Miller indices are used to describe:

The mechanical strength of a crystalCrystallographic planes and directions in a latticeThe chemical composition of alloys

Module Quiz — Material Science