Yes, Morrison definitely uses objective correlative in her novel Beloved. According to www.dictionary.com, objective correlative is when a writer uses situations or sequences of events to evoke a particular emotion in the reader ("Objective correlative").
Morrison uses this technique throughout Beloved. The most prominent use of it, as someone who has read this novel several times, is through Morrison's depiction of horrifying physical abuse and desperate acts. An example of this is when Sethe attempts to kill her children (and ultimately succeeds at doing so with one of them). This is a truly horrifying, heartwrenching, unimaginable situation to read about and it evokes terror, horror, and absolute sorrow in the reader. There are many other examples, as well, as this novel is ultimately a sad one that is so very eye-opening.