|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||On the Mechanism of TRIP Behavior in Co-Cr-Ni Multi-principal Element Alloy
||Yaofeng Guo, Francisco Coury, Michael Kaufman, Amy J Clarke
|On-Site Speaker (Planned)
A series of Co-Cr-Ni multi-principal element alloys (MPEAs) of single face-centered cubic (FCC) phase were designed using a combined method of solid solution strengthening and CALPHAD phase equilibria modeling. The single phase FCC MPEAs transform to a hexagonal close-packed phase during deformation at room temperature, exhibiting significant transformation-induced plasticity (TRIP). In this work, post-mortem characterization using transmission electron microscopy (TEM) was performed to study the microstructural details of deformed samples, particularly line and planar defects. Moreover, the stacking fault energy (SFE) of different MPEAs was measured and the ease of TRIP behavior was correlated with SFE. Finally, in order to elucidate the TRIP mechanism of the present alloys, in-situ observation of microstructure evolution during straining was conducted in the TEM to study the FCC-to-HCP transformation. The TRIP behavior was explained using a model of defect-assisted transformation.