The system Indium+Mn precipitates has been irradiated with 275 keV Ar+ions at low temperatures (T<15 K). By using the depression of the superconducting transition temperatureTcas a probe for dissolved Mn atoms, it could be demonstrated that an ion‐beam induced precipitate dissolution occurs even at small Ar fluences (<1015cm−2). The maximum amount of Mn atoms which can be forced into metastable solution by irradiation depends on the preparation conditions of the samples. For high Ar fluences the dissolution effect is overlapped by the influence of the simultaneously produced radiation damage onTc.