Interface structure and chemistry in a novel steel-based composite Fe–TiB2 obtained by eutectic solidification
Interface structure and chemistry in a novel steel-based composite Fe–TiB2 obtained by eutectic solidification
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DOI：
10.1016/j.actamat.2012.08.017
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发表时间：
2012-10
期刊：
影响因子：
9.4
通讯作者：
L. Cha;S. Lartigue-Korinek;M. Walls;L. Mazerolles
中科院分区：
文献类型：
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作者：
L. Cha;S. Lartigue-Korinek;M. Walls;L. Mazerolles
新一代钢，fe - tib2复合材料，专为汽车应用而设计。与现有的钢相比，该产品具有高刚度和低密度，并且是通过直接从熔体中共晶凝固制备的。得到了均匀分布的tib2颗粒。在加工和进一步加载过程中，内部界面的结构和化学性质将清楚地决定界面黏聚的质量。在这里，原子水平上的基本研究是通过透射电子显微镜进行的。二硼化物粒子首选的界面平面是棱柱形{101¯0}面（占多数）和基面。在棱柱平面上没有检测到第二相位。基型界面或多或少地被TiC颗粒所覆盖，TiC颗粒也存在于体中和铁晶界处。对界面晶体学和缺陷进行了精确的测定。我们的研究结果有力地支持了这种新型钢基复合材料具有良好的界面凝聚力，表现出增强的力学性能。
A new generation of steels, Fe–TiB2composites, is designed for automotive applications. The product displays both a high stiffness and a low density in comparison with existing steels and is prepared by eutectic solidification directly from the melt. A homogeneous distribution of TiB2particles is achieved. The structure and chemistry of the internal interfaces will clearly determine the quality of interfacial cohesion during processing and further loading. Here, fundamental investigations at the atomic level are performed by transmission electron microscopy. The preferred interface planes for diboride particles are prismatic {101¯0} planes (in the majority) and the basal plane. No second phase is detected at prismatic planes. Basal type interfaces appear more or less covered by TiC particles, which are also present in the bulk and at iron grain boundaries. The interfacial crystallography and defects are accurately determined. Our results strongly support the good interfacial cohesion assumed for this novel steel-based composite displaying enhanced mechanical behaviour.