Is it permissible to publish an article written by a friend under my name?

If you submit the article under your name, claiming you wrote it when you did not, this is a lie that is impermissible except in exceptional circumstances, such as reconciling people, in war, in the conversations between spouses, or to save a life or property from injustice. However, if the intention is simply that you are the one who sent it to the magazine, regardless of the author, there is no harm in that. One can resort to tawriyah (ambiguity) to avoid a forbidden lie, such as writing on the letter: "From so-and-so" meaning that the letter is from you.