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| 1 | Body-centered-cubic martensite and the role on room-temperature tensile properties in Si-added SiVCrMnFeCo high-entropy alloys显示文摘We present a new class of metastable high-entropy alloys(HEAs),triggering deformation-induced martensitic transformation(DIMT)from face-centered-cubic(FCC)to body-centered-cubic(BCC),i.e.,BCC-DIMT.Through the ab-initio calculation based on 1 st order axial interaction model and combined with the Gibbs free energy calculation,the addition of Si is considered as a critical element which enables to reduce the intrinsic stacking fault energy(ISFE)in Si_xV_((9-x))Cr_(10)Mn_5 Fe_(46)Co_(30)(x=2,4,and 7 at.%)alloy system.The ISFE decreases from-30.4 to-35.5 mJ/m^(2)as the Si content increases from 2 to 7 at.%,which well corresponds to the reduced phase stability of FCC against HCP.The BCC-DIMT occurs in all the alloys via intermediate HCP martensite,and the HCP martensite provides nucleation sites of BCC martensite.Therefore,the transformation rate enhances as the Si content increases in an earlier deformation ra nge.However,the BCC-DIMT is also affected by the phase stability of FCC against BCC,and the stability is the highest at the Si content of 7 at.%.Thus,the 7Si alloy presents the moderate transformation rate in the later deformation range.Due to the well-controlled transformation rate and consequent strain-ha rdening rate,the 7Si alloy possesses the superior combination of strength and ductility beyond 1 GPa of tensile strength at room temperature.Our results suggest that the Si addition can be a favorable candidate in various metastable HEAs for the further property improvement. | Yong Hee Jo Junha Yang Won-Mi Choi Kyung-Yeon Doh Donghwa Lee Hyoung Seop Kim Byeong-Joo Lee Seok Su Sohn Sunghak Lee | 2021 | Journal of Materials Science & Technology2021，，17： | 1 |
| 2 | Implemen- tation of real-time positioning system using extended Kalman fil- ter and artificial landmark on ceiling 显示文摘 | Rusdinar Angga Kim Jungmin Lee Junha | 2012 | Journal of Mecha nical Science and Technology2012，26，3： | 1 |
| 3 | Decomposing class responsibilities using distance-based method similarity显示文摘 | Junha LEE Dae-Kyoo KIM Suntae KIM Sooyong PARK | 2016 | Frontiers of Computer Science2016，10，4： | 0 |
| 4 | Magnetic wallpaper Dirac fermions and topological magnetic Dirac insulators显示文摘Topological crystalline insulators(TCIs)can host anomalous surface states which inherits the characteristics of crystalline symmetry that protects the bulk topology.Especially,the diversity of magnetic crystalline symmetries indicates the potential for novel magnetic TCIs with distinct surface characteristics.Here,we propose a topological magnetic Dirac insulator(TMDI),whose two-dimensional surface hosts fourfold-degenerate Dirac fermions protected by either the p'_(c)4mm or p40 g0 m magnetic wallpaper group.The bulk topology of TMDIs is protected by diagonal mirror symmetries,which give chiral dispersion of surface Dirac fermions and mirror-protected hinge modes.We propose candidate materials for TMDIs including Nd_(4)Te_(8)Cl_(4)O_(2)0 and DyB_(4) based on first-principles calculations,and construct a general scheme for searching TMDIs using the space group of paramagnetic parent states.Our theoretical discovery of TMDIs will facilitate future research on magnetic TCIs and illustrate a distinct way to achieve anomalous surface states in magnetic crystals. | Yoonseok Hwang Yuting Qian Junha Kang Jehyun Lee Dongchoon Ryu Hong Chul Choi Bohm-Jung Yang | 2023 | npj Computational Materials2023，，1： | 0 |
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