Hybrid material rotational systems and methods of manufacturing

A device comprising,

• a first rotational element comprised of a first material with a first surface that rotates at a first speed;
• and
• a second rotational element comprised of a second material with a second surface that rotates at a second speed;
• wherein the first surface and the second surface are comprised of different materials and engage at a hybrid material interface to transfer motion;
• wherein the first rotational element rotates at a first cycle period, the second rotational element rotates at a second cycle period, and the first cycle period is different from the second cycle period;
• and
• wherein at least one of the first material and the second material is a bulk metallic glass;
• wherein the first material and the second material are selected for a desired property selected from the group consisting of:
• operational lifetime, operational environment, hardness, or modulus;
• wherein the first rotational element wears at a first wear rate, the second rotational element wears at a second wear rate and the first wear rate and the second wear rate are not equal;
• and
• wherein the modulus of the first material is selected proportional to the first wear rate and the modulus of the second material is selected proportional to the second wear rate.