|About this Abstract
||MS&T22: Materials Science & Technology
||High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond III
||Probing Short-Range Order and Its Effect on the Mechanical Properties of a CrCoNi Multi-principal Element Alloy Using Nanoindentation
||Mingwei Zhang, Qin Yu, Dongye Liu, Robert O. Ritchie, Andrew Minor
|On-Site Speaker (Planned)
Despite the success of directly imaging short-range ordering (SRO) in multi-principal element alloys (MPEAs) using energy-filtered TEM (EFTEM) and X-ray techniques, the effect of SRO on their mechanical properties have not been explored in detail. In the present study, we report on the results from nanoindentation experiments using quasi-static (QS) and nanoscale dynamic mechanical analysis (nanoDMA) loading conditions on CrCoNi samples with different thermomechanical treatments intended to generate different extents of SRO. Unlike the complementary uniaxial tensile experiments on bulk polycrystalline samples that show little difference in their mechanical properties, nanoindentation results exhibit a trend in pop-in loads generated by QS tests and yield strengths in quasi stress-strain curves generated by nanoDMA tests with an increasing amount of SRO. Our nanomechanical tests will be discussed in terms of complementary EFTEM characterization and implications of SRO on deformation plasticity in MPEAs.