Mechanical Alloying of Ti-24Al-11Nb (at percent) using the Simoloyer

摘要

During the last years the mechanical alloying technique has been found to be very effective in producing powders with interesting properties. By this means it is possible to synthesize alloys or composite materials with highly dispersed components far away from thermal equilibrium state like amorphous or nano-crystalline materials. Furthermore, the powder route is a way to combine elemental or prealloyed components to materials which are generally not receivea-ble by conventional processing techniques due to e.g. the immiscibility of their components. In most cases mechanical alloying leads to material transformation of the crystalline structure by solid state reactions. The Gibbs' free energy is increased to higher levels during milling and results in reactions of a lower metastable or stable state. The interaction between milling balls and powder particles can be characterized by processes like cold-welding, plastic deformation and further fragmentation of the particles.