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| 1 | A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion显示文摘This paper reports a synergistic design of high-performance BCC high-entropy alloy based on the combined consideration of the principles of intrinsic ductility of elements,maximum atomic size difference for solid solution strengthening and the valence electron concentration criterion for ductility.The single-phase BCC HfNbTaTiV alloy thus designed exhibited a high compressive yield strength of 1350 MPa and a high compressive ductility of>45%at the room temperature.This represents a 50%increase in yield strength relative to a HfNbTaTiZr alloy.This is attributed to the maximized solid solution strengthening effect caused by lattice distortion,which is estimated to be 1094 MPa.The alloy was also able to retain 53%of its yield strength and 77%of its ductility at 700℃.These properties are superior to those of most refractory BCC high-entropy alloys reported in the literature. | Zibing An Shengcheng Mao Yinong Liu Li Wang Hao Zhou Bin Gan Ze Zhang Xiaodong Han | 2021 | Journal of Materials Science & Technology2021，，20： | 9 |
| 2 | Synthesis of layered double hydroxides/graphene oxide nanocomposite as a novel high-temperature CO_2 adsorbent显示文摘In this contribution, a novel high-temperature CO2 adsorbent consisting of Mg-Al layered double hydroxide(LDH) and graphene oxide(GO)nanosheets was prepared and evaluated. The nanocomposite-type adsorbent was synthesized based on the electrostatically driven self-assembly between positively charged Mg-Al LDH single sheet and negatively charged GO monolayer. The characteristics of this novel adsorbent were investigated using XRD, FE-SEM, HRTEM, FT-IR, BET and TGA. The results showed that both the CO2 adsorption capacity and the multicycle stability of LDH were increased with the addition of GO owing to the enhanced particle dispersion and stabilization. In particular, the absolute CO2 capture capacity of LDH was increased by more than twice by adding 6.54 wt% GO as support. GO appeared to be especially effective for supporting LDH sheets. Moreover, the CO2 capture capacity of the adsorbent could be further increased by doping with 15 wt%K2CO3. This work demonstrated a new approach for the preparation of LDH-based hybrid-type adsorbents for CO2 capture. | Junya Wang Xueyi Mei Liang Huang Qianwen Zheng Yaqian Qiao Ketao Zang Shengcheng Mao Ruoyan Yang Zhang Zhang Yanshan Gao Zhanhu Guo Zhanggen Huang Qiang Wang | 2015 | Journal of Energy Chemistry2015，24，2： | 4 |
| 3 | Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy显示文摘This study explored a multi-mechanism approach to improving the mechanical properties of a Co CrFe Mn Ni high-entropy alloy through non-equiatomic alloy design and processing.The alloy design ensures a single-phase face-centered cubic structure while lowering the stacking fault energy to encourage the formation of deformation twins and stacking faults by altering the equiatomic composition of the alloy.The processing strategy applied helped create a hierarchical grain size gradient microstructure with a high nanotwins population.This was achieved by means of rotationally accelerated shot peening(RASP).The non-equiatomic Co Cr Fe Mn Ni high-entropy alloy achieved a yield strength of 750 MPa,a tensile strength of 1050 MPa,and tensile uniform elongation of 27.5%.The toughness of the alloy was 2.53×10^(10)k J/m^(3),which is about 2 times that of the same alloy without the RASP treatment.The strength increase is attributed to the effects of grain boundary strengthening,dislocation strengthening,twin strengthening,and hetero-deformation strengthening associated with the heterogeneous microstructure of the alloy.The concurrent occurrence of the multiple deformation mechanisms,i.e.,dislocation deformation,twining deformation and microband deformation,contributes to achieving a suitable strain hardening of the alloy that helps to prevent early necking and to assure steady plastic deformation for high toughness. | Zibing An Shengcheng Mao Yinong Liu Hao Zhou Yadi Zhai Zhiyong Tian Cuixiu Liu Ze Zhang Xiaodong Han | 2021 | Journal of Materials Science & Technology2021，，33： | 3 |
| 4 | In-situ revealing the degradation mechanisms of Pt film over 1000℃显示文摘Degradation of a metallic film under harsh thermal-mechanical-electrical coupling field conditions determines its service temperature and lifetime.In this work,the self-heating degradation behaviors of Pt thin films above 1000℃were studied in situ by TEM at the nanoscale.The Pt films degraded mainly through void nucleation and growth on the Pt-SiN_(x)interface.Voids preferentially formed at the grain boundary and triple junction intersections with the interface.At temperatures above 1040℃,the voids nucleated at both the grain boundaries and inside the Pt grains.A stress simulation of the suspended membrane suggests the existence of local tensile stress in the Pt film,which promotes the nucleation of voids at the Pt-Si Nxinterface.The grain-boundary-dominated mass transportation renders the voids grow preferentially at GBs and triple junctions in a Pt film.Additionally,under the influence of an applied current,the voids that nucleated inside Pt grains grew to a large size and accelerated the degradation of the Pt film. | Dongfeng Ma Shengcheng Mao Jiao Teng Xinliang Wang Xiaochen Li Jin Ning Zhipeng Li Qing Zhang Zhiyong Tian Menglong Wang Ze Zhang Xiaodong Han | 2021 | Journal of Materials Science & Technology2021，，36： | 0 |
| 5 | Heterostructure TiO2 polymorphs design and structure adjustment for photocatalysis显示文摘Atomic composite-structure materials play an important role in energy generation and storage application fields for their advanced performance.Constructing heterostructured semiconductors is a promising strategy to devise photocatalytic systems with high activity.However,most studied hererostructures are those semiconductors with different materials formed by multi-steps,researches on in-situ formed hererostructure originated from the same precursor are few reported,and the effects of different structure ratios on photocatalytic performance are ambiguous.Here,according to in-situ temperature X-ray diffraction and transmission electron microscope techniques,a nano-sized in-situ formed heterostructure of TiO_2semiconductors with anatase and TiO_2-B crystalline structures were designed,their structure ratios were adjusted,the heterostructure interface and photocatalytic reaction mechanism were also detected.Results show that high-quality heterojunction and optimum structure ratios have vital influence on photocatalytic performance,there is an obvious synergetic effect between anatase and TiO_2-B structure,degradation reactions on methyl orange(MO)under ultraviolet light irradiation prove that the highest activity toward MO removal can be obtained for material with 82.5%anatase structure. | Di He Heng Su Xueqiao Li Haijun Yu Muhammad Zubair Lin Wang Shengcheng Mao Jinshu Wang | 2018 | Science Bulletin2018，63，5： | 0 |
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