Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys
Author(s)Li, Zhiming; Springer, Hauke; Gault, Baptiste; Raabe, Dierk; Tasan, Cemal
MetadataShow full item record
High-entropy alloys (HEAs) consisting of multiple principle elements provide an avenue for realizing exceptional mechanical, physical and chemical properties. We report a novel strategy for designing a new class of HEAs incorporating the additional interstitial element carbon. This results in joint activation of twinning- and transformation-induced plasticity (TWIP and TRIP) by tuning the matrix phase’s instability in a metastable TRIP-assisted dual-phase HEA. Besides TWIP and TRIP, such alloys benefit from massive substitutional and interstitial solid solution strengthening as well as from the composite effect associated with its dual-phase structure. Nanosize particle formation and grain size reduction are also utilized. The new interstitial TWIP-TRIP-HEA thus unifies all metallic strengthening mechanisms in one material, leading to twice the tensile strength compared to a single-phase HEA with similar composition, yet, at identical ductility.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
Nature Publishing Group
Li, Zhiming, Cemal Cem Tasan, Hauke Springer, Baptiste Gault, and Dierk Raabe. “Interstitial Atoms Enable Joint Twinning and Transformation Induced Plasticity in Strong and Ductile High-Entropy Alloys.” Scientific Reports 7 (January 12, 2017): 40704.
Final published version