A method of manufacturing a part consisting of a first portion made of a first material and a second portion made of a second material, said method further comprising the following steps: - procuring a preform made of the second material, said second material being an at least partially amorphous metal adapted to increase in volume subject to temperature and pressure conditions; - procuring said first portion and a mould comprising two dies forming a cavity, and placing said first portion and the preform between the two dies having the negative shape of the part to be manufactured; - heating the combination to a temperature between the glass transition temperature Tg and the crystallisation temperature Tx of the preform in order, at the latest during this step, to enable the preform to form a foam and to enable expansion of said preform in order to fill the negative shape of the part and form said part; - cooling the combination to solidify the preform and separate the part from the dies, and in that the expansion of the amorphous metal foam preform is achieved when the pressure between the two dies is less than the gas pressure inside the preform, and: - in the case of a sealed mould, placing the cavity under vacuum to allow the expansion of the amorphous metal foam preform, or - in the case of an unsealed mould, placing the mould in an enclosure and placing the enclosure under vacuum or at a pressure sufficiently less than the gas pressure to allow the expansion of the amorphous metal foam preform. - procuring a preform made of the second material, said second material being an at least partially amorphous metal adapted to increase in volume subject to temperature and pressure conditions; - procuring said first portion and a mould comprising two dies forming a cavity, and placing said first portion and the preform between the two dies having the negative shape of the part to be manufactured; - heating the combination to a temperature between the glass transition temperature Tg and the crystallisation temperature Tx of the preform in order, at the latest during this step, to enable the preform to form a foam and to enable expansion of said preform in order to fill the negative shape of the part and form said part; - cooling the combination to solidify the preform and separate the part from the dies, and in that the expansion of the amorphous metal foam preform is achieved when the pressure between the two dies is less than the gas pressure inside the preform, and: - in the case of a sealed mould, placing the cavity under vacuum to allow the expansion of the amorphous metal foam preform, or - in the case of an unsealed mould, placing the mould in an enclosure and placing the enclosure under vacuum or at a pressure sufficiently less than the gas pressure to allow the expansion of the amorphous metal foam preform. - in the case of a sealed mould, placing the cavity under vacuum to allow the expansion of the amorphous metal foam preform, or - in the case of an unsealed mould, placing the mould in an enclosure and placing the enclosure under vacuum or at a pressure sufficiently less than the gas pressure to allow the expansion of the amorphous metal foam preform.