Automatically, No (well, at least not without customization that would require programming).
You could manually edit the first post and use the article embed function of the editor to add the embed article, however, that is just a small thumbnail.
Something like this...
Grab the AMS BB Code from the Share this article sidebar block.. .
View attachment 6549
Go to the discussion thread... (this is XF 2.2, but its the same process for earlier xf 2 versions).
View attachment 6551
Edit the first post of the thread... If you have the AMS BB Code added to the editor toolbar, you can choose the article via that function (or just copy the AMS bbcode from the article itself (as mentioned above).
View attachment 6550
Remove the existing text and add the AMS BB Code.
View attachment 6548
Click on Preview to make sure its rendering the AMS BB Code (as shown below).
View attachment 6547
And Save...
View attachment 6546
Probably not what you wanted, but figured I'd let you (and anyone else reading this), a neat trick