Abstract
Compared with cold rolling,warm rolling can significantly reduce or completely eliminate microstruc-ture damage to regulate the microstructure of the material,which is an effective method to improve the mechanical properties of the material.However,the effect of warm rolling on refractory complex concen-trated alloys(RCCAs)has rarely been reported.This research examines how warm rolling influences the microstructure,texture,and mechanical properties of the Zr45Ti15Nb30Ta10 RCCA.The RCCA was warm-rolled to a 75％reduction in thickness at 650 ℃(two-phase zone)and then annealed at 1000 ℃ for 1 h.To highlight the advantages of warm rolling,a comparison was conducted with similarly deformed and annealed cold-rolled RCCA.The warm-rolled RCCA exhibits a layered heterogeneous structure and induces the precipitation of the(Nb,Ta)-enriched bcc2 phase.The deformation texture of warm-rolled RCCA is weaker than that of cold-rolled RCCA,which is attributed to localized deformation inhomogene-ity.After annealing,warm rolling resulted in a remarkable increase in the yield strength of the RCCA,i.e.,from 861 MPa to 1071 MPa;meanwhile,moreover,the tensile plasticity was almost identical.Warm rolling leads to a change in plastic deformation of the RCCA from dislocation cross-slip to one dominated by the interaction of dislocations with subgrain boundaries as well as the bcc2 phase.The back tress gen-erated by the heterogeneous structure induced by warm rolling is also effective in increasing the yield strength of the RCCA.The remarkably layered heterogeneous structure,subgrain boundaries and textures result in warm-rolled RCCA with optimal strength-ductility combination.Our results provide an effective processing approach for tailoring the microstructure and mechanical properties of RCCAs.
基金项目
National Natural Science Foundation of China(52074257)
Chinese Academy of Sciences(ZDBS-LY-JSC023)
NETL
NSTL
万方数据