MTL 200 Midterm Preparation

These flashcards cover the key concepts and vocabulary relevant to the MTL 200 Midterm exam, providing definitions and contexts for each term.

Crystalline Material

A material in which the atoms are situated in a repeating or periodic array over large atomic distances.

Unit Cell

The smallest repeat unit of a lattice, acting as the basic structural unit of a crystal.

FCC

Face-Centered Cubic, a type of metallic crystal structure.

BCC

Body-Centered Cubic, another type of metallic crystal structure.

HCP

Hexagonal Close-Packed, a type of metallic crystal structure described by an ABAB arrangement.

Polymorphism

The ability of a material to exist in more than one crystal structure.

Allotropy

The existence of multiple crystal structures in a chemical element.

Crystallographic Directions

Vectors in a crystal structure that represent specific directions.

Crystallographic Planes

Defined planes within a crystal structure, designated by Miller indices.

Dislocation

A linear or non-linear defect in a crystal structure.

Burgers Vector

A vector that represents the magnitude and direction of lattice distortion associated with a dislocation.

Vacancies

Point defects in a crystal where an atom site is unoccupied.

Interdiffusion

The process of atoms of one metal diffusing into another metal.

Self-diffusion

The exchange of positions of atoms of the same type within a solid.

Fick's First Law

Describes steady-state diffusion where the flux is proportional to the negative gradient of concentration.

Phase Diagram

A chart that shows the phases of a material at different temperatures and compositions.

Eutectic Reaction

A reaction that occurs when a liquid transforms into two solid phases at a specific composition.

Gibb's Phase Rule

A formula that relates the number of phases, components, and degrees of freedom in a system.