Turlo Vladyslav, Rupert Timothy J
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, USA.
Department of Materials Science and Engineering, University of California, Irvine, California 92697, USA.
Phys Rev Lett. 2019 Mar 29;122(12):126102. doi: 10.1103/PhysRevLett.122.126102.
The unique three-phase coexistence of metastable B2-FeNi with stable L1_{0}-FeNi and L1_{2}-FeNi_{3} is discovered near edge dislocations in body-centered cubic Fe-Ni alloys using atomistic simulations. Stable nanoscale precipitate arrays, formed along the compression side of dislocation lines and defined as linear complexions, were observed for a wide range of compositions and temperatures. By analyzing the thermodynamics associated with these phase transitions, we are able to explain the metastable phase formation and coexistence, in the process defining new research avenues for theoretical and experimental investigations.
利用原子模拟发现在体心立方铁镍合金的边缘位错附近，亚稳的B2-FeNi与稳定的L1₀-FeNi和L1₂-FeNi₃存在独特的三相共存现象。在广泛的成分和温度范围内，观察到沿位错线压缩侧形成的稳定纳米级析出相阵列，将其定义为线性共格组织。通过分析与这些相变相关的热力学，我们能够解释亚稳相的形成和共存，在此过程中为理论和实验研究开辟了新的研究途径。
