disintegrate vs fly into pieces

disintegrate

verb
  • To cause to break up into infinitesimal parts through the use of a disintegrator. 

  • To fall apart, break up into parts. 

  • To undo the integrity of, break into parts. 

fly into pieces

How often have the words disintegrate and fly into pieces occurred in a corpus of books? (source: Google Ngram Viewer )