AlxCr10Fe53-xNi36Mo1双相多主元合金的凝固组织与冲击性能研究OA

FCC/B2 dual-phase multiprincipal element alloys combine high strength with good ductility,but their insufficient impact toughness under dynamic loading remains a key obstacle to engineering applications.To overcome this limitation,as-cast AlxCr10Fe53-xNi36Mo1(x=13,15,17 at.％)alloys with different phase volume fractions were designed and fabricated by tuning the Al/Fe ratio,with a size of φ100 mm×400 mm and a weight of 25 kg,aiming to establish composition-microstructure-property relationships.Microstructural characterization reveals that decreasing the Al/Fe ratio drives a transition from a regular lamellar eutectic structure(Al17)to a hypoeutectic microstructure with primary FCC dendrites(Al13)while simultaneously increasing the FCC phase fraction from 68.1％to 93.1％.In addition,the FCC/B2 interfacial density decreases and gradually deviates from the Kurdjumov-Sachs(K-S)orientation relationship.These structural changes significantly improve the mechanical response:the Al13 alloy achieves the most favourable balance,with a yield strength of 622 MPa,31.9％tensile ductility,and an impact energy of 19.62 J at room temperature.