Synthesis and characterization of metastable Ag-B solid solutions
(1. Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory of Silicon Materials,
Zhejiang University, Hangzhou 310027, China;
3. Department of Physics, Zhejiang University, Hangzhou 310027, China)
Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory of Silicon Materials,
Zhejiang University, Hangzhou 310027, China;
3. Department of Physics, Zhejiang University, Hangzhou 310027, China)
Abstract: Mechanical alloying (MA) was applied to Ag-B immiscible binary systems by ball milling elemental Ag and B powders. The microstructural characterization of the milled powders was carried out by XRD and TEM. The results show that face-centered-cubic (FCC) Ag-B solid solutions are formed and that the maximum ratio of B to Ag is 4∶1. The structure evolution of Ag-B solid solution during ball milling indicates that the formation of Ag-B solid solution may be divided into two stages, which are mainly substitutional and interstitial solutions separately. The decomposition of the as-milled granules under the irradiation of electron beam is observed by TEM, which reveals that the solid solutions are metastable.
Key words: mechanical alloying; Ag-B solid solution; metastable.