大塑性变形CuCo合金的氧化物稳定组织
Oxide-stabilized microstructure of severe plastically deformed CuCo alloys
摘要：
纳米晶体材料因其有益的机械和物理性质而众所周知。然而，在高温下稳定微观结构以拓宽应用窗口是至关重要的，例如通过杂质或氧化物钉扎晶界。CuCo合金，严重的塑性变形，使用高压扭转，被用来研究退火后的氧化物的演变。这些调查进行了电子显微镜，同步辐射高能X射线散射和原子探针断层扫描。通过原位小角散射研究监测氧化物的演变表明，在高温下，初级氧化物的生长以及另一种氧化物的形成。在热处理样品中可以观察到略微不同的粗化，这可以追溯到不同氧化物量的影响。最初过饱和的CuCo基质的变化，分解过程以及钴和铜基氧化物的形成和生长。已经发现，退火后存在的主要数量的氧化物已经可以在起始材料中找到。
英文摘要：
Nanocrystalline materials are well known for their beneficial mechanical and physical properties. However, it is of utmost importance to stabilize the microstructure at elevated temperatures to broaden the window of application e.g. by pinning grain boundaries through impurities or oxides. CuCo alloys, severe plastically deformed using high-pressure torsion, were used to investigate the evolution of oxides upon annealing. These investigations were performed using electron microscopy, synchrotron high-energy X-ray scattering and atom probe tomography. Monitoring the evolution of oxides by in-situ small angle scattering investigations indicates the growth of primary oxides as well as the formation of another species of oxide at elevated temperatures. Slightly different coarsening can be observed in heat-treated samples, which can be traced back to the influence of different oxide amounts. The initially supersaturated CuCo matrix changes by the decomposition process as well as Co- and Cu-based oxides formation and growth. It has been found that the major number of oxides which are present after annealing, can already be found in the starting materials.
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