Transition temperature corresponds to Ni and Cr.

Explanation:
The transition temperature is a property of certain metals and alloys that undergo a phase change from one crystal structure to another. This phase change is typically associated with a change in the mechanical properties of the material, such as increased hardness or improved wear resistance.

In the case of Ni and Cr, both metals exhibit a phase change at a specific temperature.

Nickel (Ni) undergoes a phase change called the Curie temperature. At this temperature, the crystal structure of Ni changes from a magnetic phase to a non-magnetic phase. The Curie temperature of Ni is around 355°C (671°F). This phase change has important implications for the magnetic properties of Ni, as it transitions from being attracted to a magnet to becoming non-magnetic.

Chromium (Cr) undergoes a phase change called the Curie-Weiss temperature. At this temperature, the crystal structure of Cr changes from a paramagnetic phase to an antiferromagnetic phase. The Curie-Weiss temperature of Cr is around 311°C (592°F). This phase change also affects the magnetic properties of Cr, as it transitions from being paramagnetic (weakly attracted to a magnet) to becoming antiferromagnetic (magnetic moments align in an alternating pattern).

Both of these phase changes are important for understanding the behavior and properties of Ni and Cr. The transition temperature, or the temperature at which these phase changes occur, is a key parameter in characterizing the materials. It helps determine the temperature range in which the materials will exhibit certain magnetic properties and can be used to design and engineer materials with specific properties for various applications.

In summary, the transition temperature corresponds to Ni and Cr, as these metals undergo phase changes at specific temperatures (Curie temperature for Ni and Curie-Weiss temperature for Cr). Understanding these phase changes is important for understanding the properties and behavior of these materials.