The Mechanical Alloying Process

The layered structure cannot be refined indefinitely by deformation due to the increasing hardness with decreasing crystallite size (for details see Sect. 3.3.2). The main alloying, therefore, occurs by an interdiffusion reaction at the created clean interfaces, if a thermodynamic driving force (negative free enthalpy of mixing) exists for this diffusion couple. The required temperature rise is provided by the heat released during the ball collisions (Sect. 3.3.2). 

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The obtained results on the mechanical alloying process and heat treatment of Al - C system, and on deformation behavior of dispersion strengthened Al - AI4C3 system prepared under different conditions, can be summarized as follows ... 

Cocco, G. Delogu, F. Schiffini, L. (2000). Toward a Quantitative Understanding of the Mechanical Alloying Process. Journal of Materials Synthesis and Processing, Vol.8, No.3-4, pp. 167-180. 

Le Bnm, P. Froyen, L. Delaey, L. (1993). The Modeling of the Mechanical Alloying Process in a Planetary Ball Mill Comparison between Theory and In-situ Observations. Materials Science and Engineering A, Vol. 161, No.l, pp. 75-82. 

FIGURE 3 Cross section SEM images of the lamellar (onion-type) structure formed in the mechanical alloying process of the Ti-15Zr-4Nb alloy particles (a, b - different magnifications)... 

Brun, P.L., Froyen, L., and Delaey, L., The modeling of the mechanical alloying process in a planetary ball mill comparison between theory and in-situ observations. Mater. Sci. Eng., A161 (1), 75-82, 1993. 

Magini, M., Burgio, N., lasonna. A., MartelU, S., PadeUa, F., and Paradiso, E., Analysis of energy transfer in the mechanical alloying process in the coUision regime, J. Mater. Synth. Process, 1 (3), 135-144, 1993. 

As during the mechanic synthesis processes of alloying and grinding take place simultaneously and as a result we have die total effect of their influence, firstly some experiments on finding possibility of thermal stability reduction of unalloyed hydrides of Ti, Y and Mg as a result of mechanic grinding only have been carried out. 

The present work reports on mechanical alloying process of the n-type Bi-Sb [4-10] solid solution which is known to be the best material in low temperature region. The effect of milling conditions on the microstructure development and the thermoelectrical properties were studied. 

Rad] studied the effect of added molybdenum powder on properties of sintered fine-grained Cu-Fe alloys. The mechanical alloying was used for the preparation of the powder mixtures. The specimens were sintered in the range 600 to 1130°C. Additions of Mo powder accelerated flic sintering process. 

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