Materials Science Flashcards
7 cards from real Fundamentals of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Materials Science flashcards as text
What crystal structure does α-iron (ferrite) have at room temperature?
Answer: Body-centered cubic (BCC)
α-iron (ferrite) has a BCC crystal structure at room temperature, transitioning to FCC austenite above 912°C.
Young's modulus (modulus of elasticity) is defined as:
Answer: The ratio of stress to strain in the elastic region
Young's modulus E = σ/ε is the slope of the linear portion of the stress-strain curve where deformation is fully recoverable.
A vacancy (point defect) in a crystal lattice is best described as:
Answer: An atom missing from its normal lattice position
A vacancy (Schottky defect) is simply a missing atom at a normally occupied lattice site.
What is the coordination number (number of nearest neighbors) for an atom in a face-centered cubic (FCC) structure?
Answer: 12
In an FCC structure each atom touches 12 nearest neighbors: 4 in its own layer, 4 in the layer above, and 4 in the layer below.
The Burgers vector of a dislocation represents:
Answer: The magnitude and direction of the lattice distortion caused by the dislocation
The Burgers vector characterizes a dislocation by quantifying the magnitude and direction of the lattice slip associated with it.
Which of the following is a thermosetting polymer?
Answer: Epoxy resin
Epoxy resin forms permanent covalent cross-links upon curing and cannot be remelted or reshaped, making it a thermosetting polymer.
Which atomic bonding type is primarily responsible for the high electrical conductivity of metals?
Answer: Metallic bonding
Metallic bonding involves a 'sea' of delocalized electrons that are free to move, enabling high electrical and thermal conductivity.