Spinodal decomposition during aging of Fe-Ni-C martensites
Spinodal decomposition during aging of Fe-Ni-C martensites
复制标题
DOI：
10.1007/bf02670166
复制
发表时间：
1989-12
期刊：
影响因子：
--
通讯作者：
K. A. Taylor;L. Chang;G. Olson;G. D. W. Smith;M. Cohen;J. B. Sande
中科院分区：
文献类型：
--
作者：
K. A. Taylor;L. Chang;G. Olson;G. D. W. Smith;M. Cohen;J. B. Sande
一个合作研究的原始Fe-Ni-C马氏体的老化结合了透射电子显微镜（TEM），原子探针场离子显微镜（APPENDIX），和电阻测量技术。室温时效导致沿沿着晶格方向的精细结构调制的快速发展<203 >。Fe-15 Ni-1C马氏体的原子探针分析揭示了富碳区的形成，其碳浓度随时间增加并接近11 at。pct C对延长衰老的影响。该过程的早期动力学是成分依赖性的，并且与碳扩散控制一致。老化反应的形态特征解释弹性应变能的考虑。根据以前的热力学模型，可以得出结论，处女Fe-C马氏体是不稳定的，相分离发生的Spinodal机制。马氏体亚结构似乎没有施加任何实质性的影响，这种分解行为。
A collaborative study of the aging of virgin Fe-Ni-C martensites has combined the techniques of transmission electron microscopy (TEM), atom-probe field-ion microscopy (APFIM), and electrical resistometry. Aging at room temperature leads to the rapid development of a finescale structural modulation along <203 > lattice directions. Atom-probe analysis of Fe-15Ni-lC martensite reveals the formation of carbon-rich regions whose carbon concentration increases with time and approaches 11 at. pct C on prolonged aging. The early stage kinetics of this process are composition-dependent and are consistent with carbon-diffusion control. The morphological features of the aging reaction are explained by elastic strain-energy considerations. In accordance with previous thermodynamic models, it is concluded that virgin Fe-C martensites are unstable and that phase separation occurs by a spinodal mechanism. The martensitic substructure does not appear to exert any substantial influence on this decomposition behavior.