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A TWIP-TRIP quinary high-entropy alloy: Tuning phase stability and microstructure for enhanced mechanical properties

机译：TWIP行程静熵合金：调谐相位稳定性和用于增强机械性能的微观结构

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摘要

To understand the relations among phase stability, microstructure and deformation behavior of a non-equiatomic quinary Fe_(40)Mn_(10)Co_(20)Cr_(20)Ni_(10) (at.%) high-entropy alloy (HEA) with both transformation- and twinning-induced plasticity (TRIP & TW1P) effects, we systematically investigated the microstructural changes under different processing conditions and the corresponding tensile properties. The HEA has a single face-centered cubic (FCC) structure after thermomechanical processing. Inclusions enriched with Mn are rarely presented due to the relatively low Mn content compared to that in the reference equiatomic HEA. The HEA shows higher yield strength (375 MPa), ultimate tensile strength (785 MPa) and total elongation (77.5%) compared to the reference equiatomic HEA (349 MPa, 657 MPa and 59.9%, respectively) at a similar grain size of～4.5 Jim, which was also accompanied by the simultaneous increase of lattice friction stress and Hall-Petch coefficient. Further, introducing non-recrystallized zones of ～8 vol% significantly increases the yield strength (589 Mpa) and ultimate tensile strength (865 Mpa), at a high elongation (69.1%). Multiple strengthening mechanisms were activated upon deformation, including dislocation slip, nano-twining, and phase transformation, which explains the rationale behand the excellent strength-ductility synergy. The work further broadens the window for achieving a wide spectrum of mechanical properties of HEAs by phase stability-oriented alloy design and microstructure tuning.
机译：要了解非赤型官方Fe_（40）MN_（10）CO_（20）CR_（20）Ni_（10）（AT.％）高熵合金（HEA）的非赤级Qu_（40）MN_（10）CO_（20）的关系之间的关系，微观结构和变形行为随着转化和孪晶诱导的可塑性（TRIP＆TW1P）效果，我们系统地研究了不同加工条件下的微观结构变化和相应的拉伸性能。 HEA在热机械加工后具有单一面朝式的立方（FCC）结构。由于参考阶段Hea中的Mn含量相比，富含Mn的含量富含Mn的夹杂物。 HEA显示出更高的屈服强度（375MPa），最终拉伸强度（785MPa）和总伸长率（77.5％），与参考赤脂HEA（349MPa，657MPa和59.9％）以类似的粒度的~~ 4.5吉姆，也伴随着格子摩擦力和霍尔竖起系数的同时增加。此外，引入〜8体积％的非再结晶区显着增加了屈服强度（589MPa）和最终拉伸强度（865MPa），高伸长率（69.1％）。在变形时激活多种强化机制，包括位错滑移，纳米缠绕和相变，这解释了理论的优异强度 - 延展性协同效应。该工作进一步拓宽了通过相位稳定的合金设计和微观结构调整来实现HEA的广谱机械性能的窗口。

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