Not directly, some apps can be moved there though... go to Settings->Apps and swipe over one to the ON SD CARD tab, any app you tick will be moved to the SD card, not that any app with widgets cannot reside on the SD (used or not) in the stock ROM, if you move something like GSAM or Accuweather, the widgets will fail.
In a few weeks Marshmallow should be out, it will allow to use your SD card like internal storage, but the disadvantage is it has to be formatted by the phone to the correct format, and Windows will not be able to read it anymore unless it is in the phone, Linux perhaps (I don't know if you are forced to use an encrypted file system or not).