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|Title:||Formation of new materials in the solid state by mechanical alloying|
|Authors:||Lu, L. |
solid stat diffusion
|Source:||Lu, L.,Lai, M.O. (1995). Formation of new materials in the solid state by mechanical alloying. Materials and Design 16 (1) : 33-39. ScholarBank@NUS Repository.|
|Abstract:||This paper studies the mechanisms of formation of new materials in the solid state using mechanical alloying. Several key factors have been observed to control the formation of new alloys. These factors are: activation energy, which is related to the formation of defects during collision of powder particles; temperature, which is associated with the plastic deformation of powder particles and sliding between these particles, and between high energetic balls and powder particles; and crystalline size, which is related to the formation of nanometer crystalline during mechanical alloying. It is found that the diffusion process during mechanical alloying is controlled by both mechanical and thermal energy. The activation energy can be lowered by introducing defects, which in turn results in an increase in diffusivity. By reducing grain size, effective diffusivity can be increased significantly. Grain boundary and free surface diffusions are found to prevail to enable diffusion to proceed at relatively low temperature. © 1995.|
|Source Title:||Materials and Design|
|Appears in Collections:||Staff Publications|
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