摘要：In order to evaluate interstitial strengthening effect on the properties of high entropy alloy(HEA),a nitrogen-doped Cr Mn Fe VTi6 HEA was fabricated by mechanical alloying(MA)and spark plasma sintering(SPS).XRD,SEM,TEM and FIB were used to characterize the phase co.position and microstructure of this *** sintered bulk HEA exhibits a microstructure co.prising TiNx,BCC,Laves and B2 *** HEA exhibits high yield strength(>2729 MPa)and hardness in lower temperature range of<380℃.Quantitative calculations of the co.tributions from each strengthening mechanism in the BCC phase indicate that the interstitial strengthening by nitrogen is the dominant *** additions in the BCC phase can produce a yield strength increase of-634 MPa/at.%,which is much higher than the strengthening effects of carbon or boron additions in other *** demonstrates that adding nitrogen is a viable approach for enhancing the strength of HEAs.