Method of making a multi-composition fiber

A method of making a multi-composition fiber, the method comprising:

• providing a precursor laden environment;
• forming a fiber in the precursor laden environment using laser heating;
• wherein the precursor laden environment comprises a primary precursor material and an elemental precursor material:
• the primary precursor material comprising a precursor for a material selected from the group consisting of silicon carbide, boron carbide, silicon nitride, zirconium carbide, hafnium diboride, hafnium carbide, tantalum carbide, niobium carbide, tantalum diboride, zirconium diboride, tungsten diboride, hafnium nitride, tantalum nitride, zirconium nitride, and combinations thereof;
• and
• the elemental precursor material comprising a precursor for a material selected from the group consisting of hafnium, tantalum, niobium, yttrium, lanthanum, cerium, zirconium, molybdenum, tungsten, hafnium carbide, tantalum carbide, niobium carbide, tantalum diboride, zirconium diboride, tungsten diboride, hafnium nitride, tantalum nitride, zirconium nitride, and combinations thereof;
• and
• wherein the fiber comprises a primary fiber material and an elemental additive material, the elemental additive material having too large an atom size to fit within a single crystalline domain within a crystalline structure of the fiber, and being deposited on grain boundaries between adjacent crystalline domains of the primary fiber material to present an energy barrier to atomic diffusion through the grain boundaries, and to increase creep resistance by slowing down grain growth between the adjacent crystalline domains of the primary fiber material.