|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Unveil the Origin of Segregation-assisted Hardening in CoCrNi-Alloys with varying Mo Content Using Correlative TEM/APT Microscopy
||Manuel Köbrich, Daniel Hausmann, Gernot Hausch, Steffen Neumeier, Mathias Göken
|On-Site Speaker (Planned)
Correlative microscopy techniques as the combination of transmission electron microscopy (TEM) and atom probe tomography (APT) are capable of revealing deeper insights in segregation processes of solute alloying elements towards planar defects in low stacking fault energy alloys. Detailed knowledge concerning segregation effects therefore facilitates further tailoring of mechanical properties. This work investigates the secondary hardening mechanism by Mo-segregation in CoCrNi based systems, derivates of the commercial alloy MP35N (35Co-35Ni-20Cr-10Mo) with varying Mo content. This leads to an effect on the tensile strength after previous cold rolling due to the modification of the stacking fault energy. Secondary hardening, introduced by additional heat treatment, further improves the tensile strength up to 2400 MPa for the highest Mo content. Furthermore, TEM for characterization of observed planar defects and APT, to determine the local chemical composition were used highlighting the influence of elemental segregation on the mechanical properties.
||High-Entropy Alloys, Mechanical Properties, Other