brittleness vs embrittlement

brittleness

noun
  • The property by virtue of which a material is fractured without appreciable deformation by the application of load. 

  • The state of being brittle; aptness to break; fragility. 

embrittlement

noun
  • The process of being embrittled; loss of flexibility or elasticity of a material. 

How often have the words brittleness and embrittlement occurred in a corpus of books? (source: Google Ngram Viewer )