Abstract
The paper concentrates on mechanical alloying (MA), a high-energy ball-milling technique, used for preparing powders of Al3Ti, Al3Zr, and Al3Hf. The synthesis of these alloys by MA is reported, and the formation of metastable phases, the thermal stability of these phases, and their lattice parameters are discussed. It is noted that the closeness of the lattice and structure parameters between Al and the Al3X intermetallic phases offers the possibility of coherent precipitates in the Al matrix, while the use of hexane during MA leads to the formation of fine uniformly dispersed carbide precipitates in the matrix. It is pointed out that this, in combination with the fine grain size of the matrix and intermetallic precipitates should lead to cumulative improvements in the properties of the alloys. 23 refs.
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