An oriented single grain of a γ/γ superalloy is deformed by dynamic compression(12%, 20°C) along [001]. Thin deformation twins are observed for the first time in such a single grain using high resolution electron microscopy. They appear to develop more easily in γ corridors between γ precipitates.Un monograin oriente de superalliage γ/γ est deforme en compression dynamique (12 %, 20 °C) selon [001]. De fines macles de deformation sont observees pour la premiere fois dans un tel monograin en microscopie electronique a haute resolution. Elles semblent se developper plus facilement dans les couloirs γ separant les precipites γ .