Several body-centered-cubic(BCC)refractory high entropy alloys(HEAs),i.e.,HfNbTaTiZr,NbTaTiZr,HfNbTiZr and NbTiZr,were annealed at intermediate temperatures for 100 h,and their microstructures and aging behaviors were studied in detail.All these HEAs start to decompose into multiple phases at around 500℃,but reenter the single-phase region at significantly different temperatures which were determined to be 900,1000,1100 and above 1300℃for HfNbTiZr,NbTiZr,HfNbTaTiZr and NbTaTiZr,re-spectively.Our analysis indicates that the onset decomposition temperature in these four HEAs is closely related to the elemental diffusion rates while the ending decomposition temperature is strongly depen-dent on the elemental melting points.Our findings are important not only for understanding phase sta-bility of HEAs in general,but also for adjusting processing parameters to optimize mechanical properties of these HEAs.

P.P.Cao;H.L.Huang.S.H.Jiang X.J.Liu;H.Wang Y.Wu;Z.P.Lu

Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

材料科学技术（英文版）

[1]P.P.Cao;H.L.Huang.S.H.Jiang X.J.Liu;H.Wang Y.Wu;Z.P.Lu-.Microstructural stability and aging behavior of refractory high entropy alloys at intermediate temperatures)[J].材料科学技术（英文版）,2022(27):243-254

HfNbTaTiZr,NbTaTiZr,HfNbTiZr,NbTiZr,reenter

Microstructural,stability,aging,refractory,high,entropy,alloys,intermediate,temperatures,Several,body,centered,cubic,BCC,HEAs,were,annealed,their,microstructures,behaviors,studied,detail,All,these,start,decompose,into,multiple,phases,around,but,single,region,significantly,different,which,determined,above,spectively,Our,analysis,indicates,that,onset,decomposition,four,closely,related,elemental,diffusion,rates,while,ending,strongly,depen,dent,melting,points,findings,are,important,not,only,understanding,general,also,adjusting,processing,parameters,optimize,mechanical,properties

0.524474