Achieving outstanding heat-resistant Mg-Gd-Y-Zn-Mn alloy via introducing RE/Zn segregation on & alpha;-Mn nanoparticles

A novel Mg-8Gd-2Y-1.5Zn-1Mn (GYZ-1Mn, wt.%) alloy with extraordinary high-temperature mechanical properties was developed by introducing RE/Zn segregation on & alpha;-Mn nanoparticles. Its ultimate tensile stress (UTS) and yield stress (YS) are 312 MPa and 248 MPa at 300 celcius, which are 87 MPa and 52 MPa higher than the highest strengths of other Mg-Gd-Y-Zn alloys reported in the previous literature. The outstanding performance of GYZ1Mn alloy was associated with the segregation of RE/Zn atoms on the & alpha;-Mn nanoparticles, which facilitated the formation of fine lamellar long period stacking ordered (LPSO) phase and impeded the coarsening of & alpha;-Mn. Consequently, retarded dynamic recrystallization behavior occurred in the GYZ-1Mn, resulting in fine grain size, high density of geometrically necessary dislocations and strong fiber texture intensity to strengthen the hightemperature mechanical properties. Hence, this work paved a novel path for the development of heat-resistant Mg alloys by introducing elemental segregation on nanoparticles.

Automated summary

A novel Mg-8Gd-2Y-1.5Zn-1Mn (GYZ-1Mn) alloy with exceptional high-temperature mechanical properties was developed by introducing RE/Zn segregation on α-Mn nanoparticles. The outstanding performance of GYZ1Mn alloy was attributed to the segregation of RE/Zn atoms on the α-Mn nanoparticles, which promoted the formation of fine lamellar long period stacking ordered (LPSO) phase and hindered the coarsening of α-Mn. As a result, delayed dynamic recrystallization occurred in GYZ-1Mn, resulting in fine grain size, high density of geometrically necessary dislocations, and strong fiber texture intensity, thereby strengthening the high-temperature mechanical properties. Therefore, this work paved a new path for the development of heat-resistant Mg alloys by introducing elemental segregation on nanoparticles.