Formation and stability of nanocrystalline alloys synthesized by mechanical milling.

摘要

Nanocrystalline materials are expected to have quite different physical properties from both conventional polycrystalline materials and amorphous materials, particularly due to high fraction of grain boundaries. For their application, to improve the stability is of great concern. In this study, nanocrystalline Ti-Cu, Ti-Zr-Cu and Nb-Cu alloys were synthesized by the mechanical alloying technique. Macroscopically, supersaturated single-phase solid solutions were obtained in the form of powder after certain duration of ball milling. The powders obtained were characterized by X-ray diffraction, differential scanning calorimetry, transmission electron microscopy and small angle X-ray scattering. In Ti-Cu and Ti-Zr-Cu systems, crystal grains do not grow by heating until the intermetallic Cu(Ti, Zr)