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論文

Cryogenic-to-ambient evolution of hetero-deformation-induced strengthening in dual-phase medium-entropy alloys

Ha, H.*; Kim, J.*; Gu, G. H.*; Harjo, S.; Gong, W.; Hong, S.-J.*; Kim, H. S.*

Materials Characterization, 234, p.116086_1 - 116086_12, 2026/04

https://doi.org/10.1016/j.matchar.2026.116086
 被引用回数：2 パーセンタイル：94.05(Materials Science, Multidisciplinary)

Dual-phase (DP) high- and medium-entropy alloys (H/MEAs), consisting of face-centered cubic (FCC) and body-centered cubic (BCC) phases, have attracted attention because of their excellent strength-ductility balance. However, the temperature dependence of hetero-deformation-induced (HDI) strengthening remains unclear. In this study, an Al$$_{7}$$(CoNiV)$$_{93}$$ DP MEA was investigated using in-situ neutron diffraction and multiscale electron microscopy. Both intrinsic strength and HDI strengthening increased at cryogenic temperature. This enhancement originated from the increased lattice friction stress of the hard BCC phase and suppressed dislocation mobility at low temperature, which promoted dislocation accumulation at heterogeneous interfaces. These findings provide insights into temperature-dependent HDI strengthening in DP H/MEAs and related alloy systems.

論文

Surface severe plastic deformation-enabled deformation behavior control and mechanical property enhancement in metastable ferrous medium-entropy alloys

Gu, G. H.*; Jeong, S. G.*; Lee, J. H.*; Harjo, S.; Gong, W.; Amanov, A.*; Bae, J. W.*; Kwon, H.*; Kim, H. S.*

International Journal of Plasticity, 197, p.104581_1 - 104581_21, 2026/02

https://doi.org/10.1016/j.ijplas.2025.104581
 被引用回数：9 パーセンタイル：81.63(Engineering, Mechanical)

Stacking fault energy (SFE) controls key deformation mechanisms in metals. This study demonstrates that apparent SFE and deformation behavior can be tuned by modifying only the near-surface microstructure ($$sim$$100 um) through surface severe plastic deformation. The resulting gradient microstructure reduces apparent SFE, promoting martensitic transformation via preferential nucleation and stress partitioning. Consequently, mechanical properties are enhanced, achieving higher strength with minimal ductility loss, highlighting the effectiveness of localized microstructural engineering.

論文

Mechanistic insights into deformation, load redistribution, and stress partitioning in high-strength dual-phase medium-entropy alloys

Gu, G. H.*; Ha, H.*; Harjo, S.; Gong, W.; Louzguine-Luzgin, D. V.*; Kim, H. S.*

Materials Science & Engineering A, 943, p.148818_1 - 148818_10, 2025/10

https://doi.org/10.1016/j.msea.2025.148818
 被引用回数：4 パーセンタイル：56.20(Nanoscience & Nanotechnology)

High-strength structural alloys are essential for advanced engineering. This study explores the mechanical behavior of a dual-phase AlCoNiV medium-entropy alloy (MEA) with FCC and BCC phases. The alloy shows excellent performance, with a yield strength of 1148 MPa, tensile strength of 1556 MPa, and 40% uniform elongation. In-situ neutron diffraction and EBSD analyses reveal that strength originates from the intrinsic responses of both phases. The BCC phase carries more load, while dislocation buildup at phase boundaries enhances strength via hetero-deformation-induced (HDI) strengthening. Synergistic effects, including stress partitioning and load redistribution, further improve mechanical performance. These findings highlight the role of phase-specific properties and interphase interactions in alloy robustness and offer insights for microstructural optimization.

論文

L$"u$ders band-assisted high uniform ductility in ultrastrong ferrous medium-entropy alloy via hierarchical microstructure

Kwon, H.*; Lee, J. H.*; Zargaran, A.*; Harjo, S.; Gong, W.; Wang, J.*; Gu, G. H.*; Lee, B.-J.*; Bae, J. W.*; Kim, H. S.*

International Journal of Plasticity, 190, p.104378_1 - 104378_18, 2025/07

https://doi.org/10.1016/j.ijplas.2025.104378
 被引用回数：17 パーセンタイル：95.86(Engineering, Mechanical)

In this work, we harness a hierarchical microstructure to simultaneously tailor strengthening and deformation mechanisms in a Co$$_{21}$$Cr$$_{12.5}$$Fe$$_{55}$$Ni$$_{4}$$Mo$$_{7.5}$$ (at%) ferrous medium-entropy alloy (MEA). A simple thermomechanical process (cold rolling and 90 s annealing) produces ultrafine recrystallized grains, non-recrystallized grains with substructures, and intragranular nanoprecipitates. This structure, with high dislocation density and fine grains, yields a high strength of $$sim$$1.60 GPa but can risk premature fracture. To overcome this, L$"u$ders deformation, enabled by ultrafine grain boundaries and stress-induced martensitic transformation at pre-existing nucleation sites, is employed. Stable L$"u$ders band propagation delays strain hardening and enables large uniform ductility. As a result, a tensile strength of $$sim$$1.84 GPa and uniform elongation of $$sim$$20% are achieved, matching the best tensile properties among reported multi-principal element alloys.

論文

Temperature-dependent deformation behavior of dual-phase medium-entropy alloy; In-situ neutron diffraction study

Gu, G. H.*; Jeong, S. G.*; Heo, Y.-U.*; Harjo, S.; Gong, W.; Cho, J.*; Kim, H. S.*; 他4名*

Journal of Materials Science & Technology, 223, p.308 - 324, 2025/07

https://doi.org/10.1016/j.jmst.2024.11.057
 被引用回数：9 パーセンタイル：89.01(Materials Science, Multidisciplinary)

Face-centered cubic (FCC) equi-atomic multi-principal element alloys (MPEAs) exhibit excellent mechanical properties from cryogenic to room temperatures. At room temperature, deformation is dominated by dislocation slip, while at cryogenic temperatures (CTs), reduced stacking fault energy enhances strain hardening with twinning. This study uses in-situ neutron diffraction to analyze the temperature-dependent deformation behavior of Al$$_{7}$$(CoNiV)$$_{93}$$, a dual-phase (FCC/BCC) medium-entropy alloy (MEA). At liquid nitrogen temperature (LNT), deformation twinning in the FCC matrix leads to additional strain hardening through the dynamic Hall-Petch effect, giving the appearance of improved strengthening at LNT. In contrast, BCC precipitates show dislocation slip at both 77 K and 298 K, with temperature-dependent lattice friction stress playing a significant role in strengthening. The study enhances understanding of deformation behaviors and provides insights for future alloy design.

論文

Magnetic properties and electronic configurations of Mn ions in the diluted magnetic semiconductor Ba$$_{1-x}$$K$$_x$$(Zn$$_{1-y}$$Mn$$_y$$)$$_2$$As$$_2$$ studied by X-ray magnetic circular dichroism and resonant inelastic X-ray scattering

鈴木 博人*; Zhao, G.*; 岡本 淳*; 坂本 祥哉*; Chen, Z.-Y.*; 野中 洋亮*; 芝田 悟朗; Zhao, K.*; Chen, B.*; Wu, W.-B.*; et al.

Journal of the Physical Society of Japan, 91(6), p.064710_1 - 064710_5, 2022/06

https://doi.org/10.7566/JPSJ.91.064710
 被引用回数：5 パーセンタイル：43.75(Physics, Multidisciplinary)

The magnetic properties and the electronic excitations of the new diluted magnetic semiconductor Ba$$_{1-x}$$K$$_x$$(Zn$$_{1-y}$$Mn$$_y$$)$$_2$$As$$_2$$ have been studied by X-ray magnetic circular dichroism (XMCD) and resonant inelastic X-ray scattering (RIXS). The sum rule analysis of the XMCD spectra indicates that the Mn atoms are in the high-spin configurations of $$d^5$$, whereas the presence of competing ferromagnetic and antiferromagnetic interactions between the Mn ions reduces the net spin moment. Based on a comparison of the RIXS line shapes with those of Ga$$_{1-x}$$Mn$$_x$$As, it is concluded that the ground state of Mn in Ba$$_{1-x}$$K$$_x$$(Zn$$_{1-y}$$Mn$$_y$$)$$_2$$As$$_2$$ consists of both the $$3d^5 underline{L}$$ and $$3d^5$$ electron configurations.

論文

Field-tuned magnetic structure and phase diagram of the honeycomb magnet YbCl$$_3$$

Hao, Y. Q.*; Wo, H. L.*; Gu, Y. M.*; Zhang, X. W.*; Gu, Y. Q.*; Zheng, S. Y.*; Zhao, Y.*; Xu, G. Y.*; Lynn, J. W.*; 中島 健次; et al.

Science China; Physics, Mechanics & Astronomy, 64(3), p.237411_1 - 237411_6, 2021/03

https://doi.org/10.1007/s11433-020-1626-3
 被引用回数：13 パーセンタイル：65.00(Physics, Multidisciplinary)

We report thermodynamic and neutron diffraction measurements on the magnetic ordering properties of the honeycomb lattice magnet YbCl$$_3$$. We find YbCl$$_3$$ exhibits a N${'e}$el type long-range magnetic order at the wavevector (0, 0, 0) below T$$_N$$ = 600 mK. This magnetic order is associated with a small sharp peak in heat capacity and most magnetic entropy release occurs above the magnetic ordering temperature. The magnetic moment lies in-plane, parallel to the monoclinic a-axis, whose magnitude m$$_{rm Yb}$$ = 0.86(3) $$mu_B$$ is considerably smaller than the expected fully ordered moment of 2.24 $$mu_B$$ for the doublet crystal-field ground state. The magnetic ordering moment gradually increases with increasing magnetic field perpendicular to the ab-plane, reaching a maximum value of 1.6(2) $$mu_B$$ at 4 T, before it is completely suppressed above $$sim$$9 T. These results indicate the presence of strong quantum fluctuations in YbCl$$_3$$.

論文

Coordination number regulation of molybdenum single-atom nanozyme peroxidase-like specificity

Wang, Y.*; Jia, G.*; Cui, X.*; Zhao, X.*; Zhang, Q.*; Gu, L.*; Zheng, L.*; Li, L. H.*; Wu, Q.*; Singh, D. J.*; et al.

Chem, 7(2), p.436 - 449, 2021/02

https://doi.org/10.1016/j.chempr.2020.10.023
 被引用回数：375 パーセンタイル：99.75(Chemistry, Multidisciplinary)

Nanozymes are promising alternatives to natural enzymes, but their use remains limited owing to poor specificity. Overcoming this is extremely challenging due to the intrinsic structural complexity of these systems. We report theoretical design and experimental realization of a series of heterogeneous molybdenum single-atom nanozymes (named Mo$$_{rm{SA}}$$-N$$_{x}$$-C), wherein we find that the peroxidase-like specificity is well regulated by the coordination numbers of single Mo sites. The resulting Mo$$_{rm{SA}}$$-N$$_{3}$$-C catalyst shows exclusive peroxidase-like behavior. It achieves this behavior via a homolytic pathway, whereas Mo$$_{rm{SA}}$$-N$$_{2}$$-C and Mo$$_{rm{SA}}$$-N$$_{4}$$-C catalysts have a different heterolytic pathway. The mechanism of this coordination-number-dependent enzymatic specificity is attributed to geometrical structure differences and orientation relationships of the frontier molecular orbitals.

論文

Self-guiding of 100 TW femtosecond laser pulses in centimeter-scale underdense plasma

Chen, L.-M.; 小瀧 秀行; 中島 一久*; Koga, J. K.; Bulanov, S. V.; 田島 俊樹; Gu, Y. Q.*; Peng, H. S.*; Wang, X. X.*; Wen, T. S.*; et al.

Physics of Plasmas, 14(4), p.040703_1 - 040703_4, 2007/04

https://doi.org/10.1063/1.2720374
 被引用回数：39 パーセンタイル：75.17(Physics, Fluids & Plasmas)

レーザーの自己導波の調査のため、長いunderdenseのプラズマと100TWレーザーパルスの相互作用実験を行い、レイリー長の約20倍の10mmという非常に長いプラズマチャネルを観測した。レーザーパルスがチャネル中で曲がること、及び電子キャビティ形成が実験的に初めて観測された。

論文

Incommensurate lattice distortion in the high temperature tetragonal phase of La$$_{2-x}$$(Sr,Ba)$$_{x}$$CuO$$_{4}$$

脇本 秀一; 木村 宏之*; 藤田 全基*; 山田 和芳*; 野田 幸男*; 白根 元*; Gu, G.*; Kim, H.*; Birgeneau, R. J.*

Journal of the Physical Society of Japan, 75(7), p.074714_1 - 074714_6, 2006/07

https://doi.org/10.1143/JPSJ.75.074714
 被引用回数：26 パーセンタイル：73.25(Physics, Multidisciplinary)

高温超伝導体La$$_{2-x}$$(Sr,Ba)$$_{x}$$CuO$$_{4}$$の高温正方晶(HTT)相において観測される格子非整合な散漫散乱を、x=0.07, 0.125(Ba), 0.15, 0.20の試料について、中性子散乱実験により系統的に調べた。測定したすべての試料において、低温斜方晶(LTO)相で現れる超格子反射がHTT相で格子非整合な散漫散乱に変化する様子が観測された。散漫散乱ピークの位置、及び構造因子の考察から、散漫散乱はLTO的な八面体の傾きがHTT相で局所構造として残ることに起因し、かつ傾きの方向(Cu0$$_2$$正方格子でCu-Cuの対角線方向)に格子非整合な変調を伴っていることがわかった。変調周期の逆数に相当する格子非整合性$$delta$$は、温度上昇に伴い増加し、すべての試料で${it T/T$_{s}$}$(${it T$_{s}$}$構造相転移温度)に対して、散漫散乱の積分強度は(${it T-T$_{s}$}$)$$^{-1}$$に対して各々スケールする普遍的な振る舞いが見られた。以上の結果と、超伝導を示さないx=0.05では同様の散漫散乱が観測されないことから、格子非整合な変調を伴ったLTO歪みは超伝導領域に特有の性質であることが示された。

口頭

La$$_{2-x}$$(Sr,Ba)$$_{x}$$CuO$$_{4}$$のスピン揺らぎの異方性の研究

脇本 秀一; 加倉井 和久; 松田 雅昌; 武田 全康; 藤田 全基*; 山田 和芳*; Gu, G.*; Tranquada, J. M.*; Birgeneau, R. J.*; Zhang, H.*

no journal, , 

214型銅酸化物高温超伝導体における磁気励起へのストライプ構造の影響を調べるため、強固なストライプ構造を持つLa$$_{1.875}$$Ba$$_{0.125}$$CuO$$_{4}$$と弱いストライプ秩序を示すLa$$_{1.92}$$Sr$$_{0.08}$$CuO$$_{4}$$の単結晶を用いて偏極中性子非弾性散乱実験を行い、低エネルギー領域($$omega < 8$$meV)の磁気励起の偏極性を調べた。前者の試料では10Kでストライプ構造に起因する格子非整合弾性散乱ピークが観測され、偏極解析により秩序化したCu$$^{2+}$$スピンはCuO$$_{2}$$面内に寝ていることを確認した。偏極中性子非弾性散乱実験では$$omega = 4$$meVのエネルギーでスピンが面内にのみ揺らいでいることを観測した。これとは対照的に後者の試料では10K, 4meVでの磁気揺らぎは完全に等方的であった。以上の結果は低エネルギー磁気励起はストライプの影響を強く受けていることを示唆する。

口頭

La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$の高温正方晶での格子不安定性

脇本 秀一; 木村 宏之*; 藤田 全基*; 山田 和芳*; 野田 幸男*; 白根 元*; Gu, G.*; Kim, H.*; Birgeneau, R. J.*

no journal, , 

ホールドープ系高温超伝導体であるLa$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$では、高温正方晶(HTT)相において低温斜方晶(LTO)的な格子歪み(CuO$$_6$$八面体の傾き)が残ることが、中性子散乱実験で散漫散乱として観測されている。本研究では、超伝導と格子非整合なLTO的格子歪みとの関連を調べるため、$$x$$=0.07, 0.125(Ba), 0.15, 0.20の試料について、中性子散乱実験を行った。測定したすべての試料において、LTO的な八面体の傾きに起因した散漫散乱ピークが、かつ傾きの方向(LTO相でb軸に相当する方向)に格子非整合な変調を伴って観測された。変調周期の逆数に相当する格子非整合性$$delta$$は、温度上昇に伴い増加し、すべての試料で$$T/T_s$$($$T_s$$は構造相転移温度)に対してスケールする普遍的な振る舞いを示した。以上の結果と、超伝導を示さない$$x=0.05$$の結果から、格子非整合な変調を伴ったLTO歪みは超伝導領域に特有の性質であることが示された。

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  • 1