ENGR 1210 Homework 8 on chapters 8, 9 & 11
Part 1 Key Engineering Terms: fill in the blanks – 30 points
1. Phase: a homogeneous and distinct portion
of material system.
2. Degrees of freedom: number of variables that can be changed
___________________________________________ without changing phases of the
system.
3. Eutectoid: a steel with ____________________________ percent C.
4. Austenite has ____________________________________ crystal structure and
maximum carbon solubility of 2%.
5. Martensite: a ______________________________________ interstitial solid solution of
carbon in __________________________________________ iron.
6. Tempering: the process of _____________________________________________ a
quenched steel to increase its toughness and ductility.
7. Spherodite: a mixture of particles of _________________________ in α iron matrix.
8. Hardenability: the ease of forming _________________________________________ in
a steel upon quenching from austenitic condition.
9. White cast irons: contains large amounts of
_____________________________________ which make them hard and brittle.
2
10. Gray cast iron: contain large amount of _______________________________ flakes.
11. Ductile cast iron: contain large amount of carbon in form of
___________________________________________.
12. Malleable cast iron: __________________________________ is added to composition
other than iron and carbon.
13. Intermetallics: ___________________________________ compounds of metallic
elements with high hardness and high temperature strength but brittle.
14. Shape memory alloys: metal alloys that recover previously defined shape when subjected
to an appropriate _______________________________________.
15. Amorphous metal: metals with a ___________________________________ structure
also called glassy metal.
16. Octahedral interstitial site: has coordination umber of ____________________________.
17. Tetrahedral site: has coordination number of _______________________________.
18. Ceramic materials: __________________________________ nonmetallic materials that
consist of metallic and nonmetallic elements bonded together by ionic or covalent bonds.
19. Buckyball: is a soccer shaped molecule of _____________________________________
carbon atoms.
20. Firing: heating a ceramic material to high temperature to cause
______________________________________________ to form between particles.
21. Dry pressing: ______________________________________ uniaxial compaction and
shaping of ceramic granular particles in a die.
22. Isostatic pressing: the simultaneous compaction and shaping of a ceramic powder by
pressure applied ____________________________________ in all directions
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