Meaning
Structural change in a three-component material system resulting from variations in temperature or pressure alters the physical properties of the alloy. Observation of a ternary phase transformation reveals how the different elements interact to form new crystal structures. Engineers use this knowledge to design materials with specific thermal or magnetic characteristics.
System Equilibrium
Phases present in a mixture of three metals are mapped on a triangular diagram to show stable states. A ternary phase transformation occurs when the system moves from one region of the diagram to another, such as during cooling.
Metallurgical Transition
Precipitation of a second or third phase within the primary matrix can increase the strength of the material because the new particles block the movement of dislocations through the crystal lattice. In the study of a ternary phase transformation, the rate of cooling determines if the final structure is coarse or fine. This transition defines the mechanical limits of the metal in industrial use.
Process Boundary
Limits on the operating temperature of a component are defined by the point where a phase change begins. Control of the ternary phase transformation prevents the accidental softening of a tool or the loss of conductivity in a wire.
