Exploring Slip Systems of Face Centered Cubic Metals

[ws0619]

Hello,

Recently,I study about the slip systems of metals which regarding to the material science subject.
For face centered cubic(FCC),it slip system is {111}<110>.Hence the number of slip systems is 12.The{111}is the family for (111), (-111), (1-11), (11-1),(sorry！-1 means a bar line on top of 1).
From what I study about{111}which is the family,it not just containing those few crystallographic planes that I listed out on top,but why other planes are not consider as slip planes for FCC?

Thanks very much, I appreciate any insight.

 

[Mapes]

Slip can occur on other planes, but it's especially easy for a dislocation to move in the close-packed direction along a close-packed plane. For fcc crystals, this means {111}<110>. For bcc, it's {110}<111> (the close-packed direction on the closest-packed plane--there is no perfectly close-packed plane in bcc).

 

[oswaler]

Hello,

Thank you for sharing your interest in the slip systems of face centered cubic (FCC) metals. As a scientist in the field of material science, I can provide some insight into your question about why certain crystallographic planes are not considered as slip planes for FCC metals.

The slip systems of a material are determined by its crystal structure and the arrangement of atoms within that structure. In FCC metals, the atoms are arranged in a face-centered cubic lattice, with atoms located at the corners and centers of each face of the cube. This arrangement allows for three families of planes to act as potential slip planes: {100}, {110}, and {111}.

The {111} family is particularly important because it contains the closest-packed planes in the FCC structure. These planes have the highest density of atoms and therefore the lowest energy, making them the most favorable for slip to occur. Other planes, such as {112}, may also have close-packed planes, but they are not as closely packed as the {111} planes and therefore have higher energy barriers for slip to occur.

Additionally, the {111} planes have a unique orientation in relation to the slip direction, which is represented by the <110> notation. This orientation allows for a more efficient transfer of stress and easier movement of dislocations, which are the mechanisms of slip in metals.

In summary, the {111} planes are the most favorable for slip to occur in FCC metals due to their close-packed structure and unique orientation in relation to the slip direction. Other planes may also have close-packed planes, but they are not as energetically favorable or efficient for slip to occur. I hope this helps to clarify the importance of the {111} family as the primary slip planes for FCC metals.

Best regards,