Abstract A Cu/carbon-steel nanocomposite is fabricated by pressing, rolling and wire drawing. The average layer thickness is about 69 nm for steel and 67 nm for Cu. Cu suppresses the growth of prior austenite at elevated temperature, and thus the steel layer thickness barely increases during austenization. Subsequent quenching results in a large amount of metastable retained austenite within the steel layers. The martensitic transformation behavior of the composite during plastic deformation is investigated by in situ tensile test using synchrotron X-ray diffraction at room temperature. It is found that the retained austenite, rather than Cu, dominates the plastic deformation of the nanocomposite. In situ results verify that the transformation of retained austenite initiates in a manner of Luders-like band due to stress-induced martensitic transformation, followed by strain-induced martensitic transformation until fracture.

中文翻译：

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铜/碳钢纳米复合材料中的 Lüders 样马氏体转变：原位同步加速器研究

摘要 通过压制、轧制和拉丝制备了Cu/碳钢纳米复合材料。钢的平均层厚度约为 69 纳米，铜的平均层厚度约为 67 纳米。Cu在高温下抑制原奥氏体的生长，因此在奥氏体化过程中钢层厚度几乎不增加。随后的淬火导致钢层内有大量亚稳态残余奥氏体。通过在室温下使用同步加速器 X 射线衍射进行原位拉伸试验，研究了复合材料在塑性变形过程中的马氏体转变行为。发现残余奥氏体，而不是铜，主导了纳米复合材料的塑性变形。