Material Science Exam 3

Eutectic Temperature

The lowest possible melting point for the mixture across all mixing ratios

Eutectic Point

The specific combination of composition and temperature on a phase diagram where the liquid transitions directly into solid phases simultaneously.

Simultaneous solidification

When a eutectic liquid cools, it freezes at a constant temperature directly into an intimate, fine-grained solid mixture (often with a layered or lamellar structure) rather than freezing over a temperature range.

What microstructure is this?

Eutectic

What is this?

Eutectic pearlite

What microstructure is this?

Ferrite- pearlite

What kind of microstructure is this? What went wrong?

Over aged.

Precipitates build up in grain boundaries and can be fracture points

What microstructure is this?

precipitation hardened microstructures

Heat treating classification.

F

As fabricated

• These are semi-finished products that have not yet been thermally modified.

Heat treated classification

O

annealed. Materials with the O designations have been annealed, usually to maximize workability.

Heat treated classification

H

Strain hardened

This is for non-heat-treatable alloys that have had their strength increased by stain hardening. This process, of course, usually does not involve heat as is performed at room temperature.

Heat treated classification

T

thermally treated. This designation represents products that have gone through the entire tempering process. These materials have been given a solution heat treatment followed by quenching and artificial aging.

Aging

Tx

T1-T5 under aged

T6-perfectly aged

T7

T8-T10 aging and strain hardened