Fe-rich alloys are the most attractive among the compositionally complex alloys (CCAs) owing to the excellent combinations of mechanical properties combined with low cost. The kinetics of recrystallisation and grain growth of an austenitic Fe-35.5Ni–4Cr-6.3Al-3.2Ti alloy (in at.%) is systematically studied to balance the combination of high strength and good ductility through grain refinement and the precipitation of L1 (γ′) phase. The yield strength of the Fe-35.5Ni–4Cr-6.3Al-3.2Ti alloy can be tuned by thermo-mechanical processing from 294 MPa in the coarse-grained FCC (γ) phase structure to 1142 MPa through inducing a heterogeneous grain structure consisting of fine recrystallised grains, subgrains/deformed grains and precipitates. The fully recrystallised alloy showed a balanced combination of strength (∼1.35 GPa) and uniform elongation (∼24%). The alloy showed good strengthening by grain refinement (Hall-Petch coefficient of 581 MPa μm) and displayed an activation energy of 385 kJ/mol for static recrystallisation. The present Fe-rich CCA exhibited similar mechanical properties offered by Ni and Co-rich CCA compositions with a γ+γ′-phase structure, but at a substantially low alloying cost (<50%).

中文翻译：

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通过再结晶将沉淀 (γ') 硬化的富铁复合合金的强度和延展性结合起来

由于机械性能与低成本的优异结合，富铁合金在成分复杂的合金（CCA）中最具吸引力。系统研究了奥氏体 Fe-35.5Ni-4Cr-6.3Al-3.2Ti 合金（at.%）的再结晶和晶粒生长动力学，通过晶粒细化和 L1 析出来平衡高强度和良好延展性的结合。 (γ′)相。Fe-35.5Ni-4Cr-6.3Al-3.2Ti合金的屈服强度可以通过热机械加工通过诱导异质晶粒结构从粗晶FCC（γ）相结构中的294 MPa调整到1142 MPa细小的再结晶晶粒、亚晶粒/变形晶粒和沉淀物。完全再结晶的合金表现出强度（~1.35 GPa）和均匀伸长率（~24%）的平衡组合。该合金通过晶粒细化表现出良好的强化效果（霍尔佩奇系数为 581 MPa μm），并且静态再结晶的活化能为 385 kJ/mol。本发明的富铁CCA表现出与具有γ+γ'相结构的富镍和富钴CCA组合物相似的机械性能，但合金成本相当低（<50%）。