High-/medium-entropy stainless alloys (HESAs/MESAs) are a new kind of alloys with great potential to combine excellent properties from high-/medium-entropy alloys (HEAs/MEAs) and stainless steels. A CrFeNi MESA was chosen to investigate its microstructures and mechanical behaviors. After homogenization, the strength and ductility of CrFeNi MESAs with single-phase face-centered-cubic (fcc) structure were higher compared with those of Fe_100−x–yCr_xNi_y austenitic stainless steels. Cr-rich body-centered-cubic (bcc) precipitates and heterogeneous structure were introduced by cold rolling and annealing at 800 °C. Rolling at 700 °C results in higher dislocation density and the occurrence of lamellar Cr-rich bcc precipitates. High-density dislocations and fcc grains with heterogeneous structure, together with Cr-rich bcc precipitates, contribute to a yield strength improvement of about 50 MPa, and appreciable tensile yield strength of ~ 540 MPa and fracture strain of ~ 20% are obtained. It reveals that not only compositional variations but also grain size and phase structure tuning can be utilized for achieving desired mechanical properties.

高/中熵不锈钢（HESAs / MESA）是一种新型合金，具有将高/中熵合金（HEAs / MEAs）和不锈钢的优异性能相结合的巨大潜力。选择CrFeNi MESA来研究其微观结构和力学行为。均质后，具有单相面心立方（fcc）结构的CrFeNi MESA的强度和延展性高于Fe _{100− x – y} Cr _x Ni _y奥氏体不锈钢。通过在800°C下冷轧和退火引入富铬的体心立方（bcc）沉淀和非均质结构。在700°C的温度下轧制会导致更高的位错密度，并出现层状富Cr的bcc沉淀。高密度位错和具有异质结构的fcc晶粒，以及富含Cr的bcc沉淀物，有助于使屈服强度提高约50 MPa，并获得约540 MPa的可观拉伸屈服强度和〜20％的断裂应变。它表明，不仅可以利用成分变化，而且可以利用晶粒尺寸和相结构调节来获得所需的机械性能。