The forward and center add to the Terps' frontcourt depth and take up their last two scholarship spots.
Carey averaged 13.5 points per game for the Hoyas last season.
Young averaged 19.6 points per game for Charlotte last season and will become the first DeMatha product to commit to the Terps in 20 years.
Willard becomes the 10th head coach in Terp history.
With the loss, the Terps finish the season with a losing record for the first time since 1993.
The majority of the current Terps — including interim head coach Danny Manning — had never competed in the Big Ten before this season.
Despite Russell and Ayala being honorable mentions, no Terp was named to any of the all-Big Ten teams for the second straight season.
The Terps went down 18-1 early and never managed to take the lead throughout the game.
Jamison Battle scored 39 points, but the Terps were able to come away with a win off a strong team effort.
The Terps managed to hold onto its lead despite challenge from the Golden Gophers' Jamison Battle who finished with 39 points.