摘要
Alloys with a hexagonal close-packed(HCP)lattice often suffer from intrinsic brittleness due to their in-sufficient number of slip systems,which limits their practical uses.In this paper,nevertheless,we show that remarkably tensile ductility in HCP Hf-Zr-Ti medium entropy alloys(MEAs)was achieved,particu-larly in the MEAs with a higher content of Hf.Both first-principles calculation and experimental analyses reveal that addition of Hf increases basal I2 stacking fault energy and decreases prismatic stacking fault energy in these HCP MEAs,which promotes the source of pyramidal dislocations due to the facilitated cross slips of basal dislocations and eventually give rise to the observed large tensile ductility.Our current findings not only shed new insights into understanding deformation of HCP alloys,but also provide a basis for controlling alloying effects for developing novel HCP complex alloys with optimized properties.
基金
supported by the National Natural Science Foundation of China(Nos.11790293,51871016,51671021,51971017,52122408,52071023,51901013)
the Funds for Creative Research Groups of China(51921001)
111 Project(BP0719004)
Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05)
financial support from the Fundamental Research Funds for the Central Universities of China(No.FRF-TP-18-004C1,No.FRF-BD-19-002B,respectively)
financial support from Projects of SKLAMM-USTB(2019Z-01,2018-Z01,2022Z-09).
