Abstract: Contacting the wellbore with a fluid composition and forming a metallic powder barrier at or near the tip of a fracture extending from the wellbore into a subterranean formation may strengthen a wellbore. The fluid composition may include a base fluid and a metallic powder having a plurality of metallic powder particles. The base fluid may include a drilling fluid, a completion fluid, a servicing fluid, a fracturing fluid, and mixtures thereof. The metallic powder particles may have a particle core and a metallic coating layer. The particle core may include a core material selected, such as magnesium, zinc, aluminum, manganese, vanadium, chromium, molybdenum, iron, cobalt, silicon, nitride, tungsten, and a combination thereof. The metallic coating layer may be disposed on the particle core thereby forming a metallic powder particle. The metallic powder particles may be configured for solid-state sintering to one another to form the metallic particle compacts.