So in html 5, is the div element is taken away and replaced with the <article> tag?

Question

<article> replaces <div> fully in html5?

Answer 1

No.
Actually you can write anything as a tag. example: <mybox>, or <sonny>. Div is short for division so it is used.

Using anything is possible, but article, nav etc, are created to bring consistency and similarity in writing.