Is there such a thing as a Boron-Carbon-Lithium alloy?
In the study Compound Formation in the Systems Lithium-Carbon and Lithium-Boron, Journal of the American Ceramic Society, Volume 50, Issue 10, October 1967, Pages 520–523 

molten lithium metal was added to $\ce{B_{4.0}C}$ in proportions ranging from 7 to 71% lithium.  


  a  substitution  reaction  evidently  occurs  between 
  lithium  and  boron  carbide  which  leads  to  the  formation  of 
  lithium  boride  and  lithium  carbide