A segmented knife assembly for a mixer apparatus is disclosed. The knife assembly has a front, a rear, and a perimeter with a cutting edge forming a portion of the perimeter. The segmented knife assembly includes a support portion positioned toward the rear of the knife assembly for positioning on the auger of the mixer apparatus when the knife assembly is mounted on the mixer apparatus, and a positioning portion on the support portion and defining at least one positioning pocket, with the pocket being oriented toward the cutting edge of the knife assembly. The assembly also include a cutting portion removably positioned in the pocket of the positioning portion. The cutting portion includes a cutting edge section that forms at least a portion of the cutting edge of the knife assembly.