Cutting elements, earth-boring tools incorporating such cutting elements, and methods of forming such cutting elements

An earth-boring tool, comprising:

• a body;
• and
• at least one cutting element attached to the body, the cutting element comprising:
• a substrate having a central axis, wherein an exposed lateral side surface of the substrate is reflectively and rotationally asymmetric with respect to all axes and planes intersecting with the substrate;
• a polycrystalline table attached to the substrate at an interface;
• and
• an interface feature located at the interface between the substrate and the polycrystalline table, the interface feature comprising a plurality of radially extending spokes that are reflectively asymmetric about at least two planes defined by x, y, and z axes of a Cartesian coordinate system defined to align a z axis of the coordinate system with the central axis of the substrate and to locate a center of the coordinate system at a midpoint along an axial height of the interface feature, the plurality of radially extending spokes being rotationally asymmetric about at least the central axis of the substrate.

A method of forming a cutting element, comprising:

• forming an asymmetric interface feature at an end of a substrate, the interface feature comprising a plurality of radially extending spokes that are reflectively asymmetric about at least two planes defined by x, y, and z axes of a Cartesian coordinate system defined to align a z axis of the coordinate system with a central axis of the substrate and to locate a center of the coordinate system at a midpoint along an axial height of the interface feature, the plurality of radially extending spokes being rotationally asymmetric about at least the central axis of the substrate, wherein an exposed lateral side surface of the substrate is reflectively and rotationally asymmetric with respect to all axes and planes intersecting with the substrate;
• distributing a plurality of superhard particles on the substrate over the interface feature in a mold;
• and
• bonding the superhard particles in the mold to form a polycrystalline table attached to the substrate.

A method of forming a cutting element, comprising:

• forming an asymmetric interface feature in a polycrystalline table, the interface feature comprising a plurality of radially extending spokes that are reflectively asymmetric about at least two planes defined by x, y, and z axes of a Cartesian coordinate system defined to align a z axis of the coordinate system with a central axis of the polycrystalline table and to locate a center of the coordinate system at a midpoint along an axial height of the interface feature, the plurality of radially extending spokes being rotationally asymmetric about at least the central axis of the substrate;
• distributing a plurality of hard particles and a plurality of particles comprising a matrix material on the polycrystalline table and over the interface feature in a mold;
• and
• sintering the plurality of hard particles and the plurality of particles comprising a matrix material in the mold to form a substrate attached to the polycrystalline table, wherein an exposed lateral side surface of the substrate is reflectively and rotationally asymmetric with respect to all axes and planes intersecting with the substrate.