Question

In the close-pack model for hard spheres, there are repeating voids in the 3D lattice that are created. When a second layer is added to the first close-packed layer there is a void directly under each sphere. The geometry of this void is _______. The other void has a(n) _______ geometry. These void spaces become important when one considers alloys. The type of alloy that is created when a different atom, that is relatively _______ (large/small), occupies some of the voids is called an _______ alloy. For instance, when iron is treated with _______ steel is formed. It is more resistant to sheering and bending as the included atoms strenthens the lattice.

Answer 1

In the close-pack model for hard spheres, there are repeating voids in the 3D lattice that are created. When a second layer is added to the first close-packed layer there is a void directly under each sphere. The geometry of this void is Tetraedral. The other void has a(n) octaedral geometry.

These void spaces become important when one considers alloys. The type of alloy that is created when a different atom, that is relatively small (large/small), occupies some of the voids is called an Interstitial alloy. For instance, when iron is treated with carbon steel is formed. It is more resistant to sheering and bending as the included atoms strenthens the lattice.