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Synthesis of metallic glasses and metallic glass based composites in the cu-mo-hf system by ion beam mixing

Science China(Technological Sciences) 2012年第5期55卷 1353-1358页

作者： BAI Xue WANG TongLe cuI YuanYuan DING Ning LI JiaHao LIU BaiXin Advanced Materials Laboratory Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Single-phase and dual-phase metallic glasses as well as metallic glass based composites were synthesized in the cu-mo-hf ternary metal system by 200 keV xenon ion beam mixing of far-from-equilibrium. It was found that mo-hf-based and cu-mo-based single-phase metallic glasses could be obtained at compositions around culTmo20hf63 and cu34mo57hf9, respectively. Interestingly, at the nearly equal-atomic stoichiometry of cu38mo31hf3i, a dual-phase cu-mo-hf metallic glass, consisting both of the mo-hf-based and cu-mo-based phases, was first obtained at relatively low irradiation doses ranging from （1-5）×10^15 Xe＋/cm2, and a single-phase metallic glass was eventually obtained at a dose of 7×10^15 Xe＋/cm2. In addition, two glass-based composites were obtained at the compositions of cu14mo62hf24 and cu77mo14hf9, and they consisted of the mo-hf based and cu-mo based metallic glasses, dissolved with some uniformly distributed BCC mo-based and FCC cu-based crystalline solid solutions, respectively. The formation mechanism of the above described non-equilibrium alloy phases was also discussed in terms of the atomic collision theory.

关键词： cu-mo-hf system ion beam mixing metallic glass dual-phase metallic glass glass-based composite

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