Correct option is B
Alpha iron is the
ferrite phase of iron, which exists at room temperature and up to
910°C. It is the stable phase of iron at lower temperatures in the
iron-carbon phase diagram.
Crystal Structure:
· Alpha iron (α-iron) has a
Body-Centered Cubic (BCC) crystal structure.
· In BCC, atoms are located at the
corners of the cube and
one atom is in the center of the cube.
· Total atoms per unit cell =
2.
Properties of Alpha Iron (BCC):
·
Soft and Ductile: Due to relatively low packing efficiency of BCC (68%).
·
Magnetic Behavior: Alpha iron is
ferromagnetic up to its Curie temperature (770∘C).
·
Low Density: Packing efficiency is lower than FCC or HCP structures.
