Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

# Questions

### Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

1. Where α and β are solid phases, which of the following describes a eutectic transformation?

 a $$\alpha + {\rm{liquid}} \to \beta$$ b $$\alpha \to \beta$$ c $${\rm{liquid}} \to \beta + \alpha$$ d $${\rm{liquid}} \to \beta + {\rm{liquid}}$$

2. Where α and β are solid phases, which of the following describes a peritectic transformation?

 a $$\alpha + {\rm{liquid}} \to \beta$$ b $$\alpha \to \beta$$ c $${\rm{liquid}} \to \beta + \alpha$$ d $${\rm{liquid}} \to \beta + {\rm{liquid}}$$

3. Which of the following alloying additions stabilises the austenite phase of steel? (You may select more than one)

1. Carbon - C
2. Nickel - Ni
3. Cerium - Ce
4. Silicon - Si

4. What differences in appearance might you expect between annealing and deformation twins?

 a Annealing twins are smaller than deformation twins b Deformation twins are smaller than annealing twins c Deformation twins have flat sides, annealing twins are lens-shaped d Annealing twins have flat sides, deformation twins are lens-shaped e There are no differences

5. Why is spheroidal cast iron tougher than grey cast iron?