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- 저자 : Lianmeng Zhang (검색결과 3 건)
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Jian Zhang,Shuai Ma,Jiawen Zhu,Kejia Kang,Guoqiang Luo,Chuandong Wu,Qiang Shen,Lianmeng Zhang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
In this work, W/HfC composite materials were synthesized using plasma activated sintering. The influence of the sinteringtemperature and HfC weight fraction on the relative density, microstructure and compression strength were investigated. The results demonstrated that the sintering temperature and the HfC content significantly affected the microstructure of W/HfC composites. Moreover, the grain size of the W/HC composites decreased and the mechanical properties were improvedremarkably due to the addition of HfC. The majority of HfC particles reacted with oxygen impurities to generate HfO2,whichpurified the grain boundaries and refined the grain size of the W matrix. The optimum content of HfC is 2 wt%, at which ahigh compressive strength of 1.98 GPa and a high strain of 34.7% were obtained.
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Cui, Lianmeng,Zhou, Limin,Zhang, Kai,Xiong, Fangyu,Tan, Shuangshuang,Li, Maosheng,An, Qinyou,Kang, Yong-Mook,Mai, Liqiang Elsevier 2019 Nano energy Vol.65 No.-
<P><B>Abstract</B></P> <P>Benefiting from high volumetric energy density and generally dendrite-free growth of Mg metal, rechargeable magnesium batteries (MBs) become a promising next-generation energy storage system. Organic electrode materials, with characteristic of sustainable resource and flexible structure, have been widely studied in alkali metal ion batteries, but are rarely reported in MBs. Herein, we demonstrate that 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) serves as a cathode material for MBs in non-aqueous system, which realizes a fast diffusion kinetics and remarkable Mg-storage performance through a salt-dissolution inhibition approach for the electrolyte. The PTCDA exhibits a reversible capacity of 126 mAh g<SUP>−1</SUP> (at 200 mA g<SUP>−1</SUP>), excellent rate performance, and good cycling stability (100 mAh g<SUP>−1</SUP> even after 150 cycles). Furthermore, the evolution mechanism of the PTCDA electrode based on the transformation between carbonyl groups (CO) and enolate groups (C–O) is revealed by <I>ex-situ</I> phase characterization and functional group analysis. Besides, the dissolution inhibition of the PTCDA could also be realized through the incorporation of other soluble salt (KCl or NaCl) into all phenyl complex (APC) electrolyte, resulting in an enhanced cycling capacity. Considering the designable configuration of the organic materials, this work would pave way for their utilization on multi-valent ion batteries and provide efficient strategy to realize high voltage and satisfied cycle life.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The magnesium anode in organic system was realized combined with the solubility inhibition of the host materials. </LI> <LI> Compared with other inorganic cathode materials, the PTCDA is eligible to offset the defect of Mg<SUP>2+</SUP> transport dynamics. </LI> <LI> Compared with other Mg-storage materials reported, the PTCDA demonstrates a high working voltage plateau and a small polarization. </LI> <LI> The electrochemical mechanism of the PTCDA is proved to be the transformation between carbonyl groups and enolate groups. </LI> <LI> The incorporation of dissolvable salts inhibited the dissolution of the PTCDA. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Influence of Porosity on Mechanical Behavior of Porous Cu Fabricated via De‑Alloying of Cu–Fe Alloy
Lijie Zou,Fei Chen,Hao Wang,Qiang Shen,Enrique J. Lavernia,Lianmeng Zhang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
We report on a study of the mechanical behavior of porous Cu containing micron-sized pores and fabricated by de-alloyingof a Cu–Fe precursor alloy. Our results show that the minimum volume fraction of pores that can be obtained by using anapproach that involves de-alloying of a Cu–Fe precursor alloy is approximately 40 vol%. Moreover, the average pore sizeformed by de-alloying Cu–Fe of varying compositions is in the range of 1.5–4.0 μm. Our mechanical behavior results revealthat the yield stress increases from 3.9 to 58.6 MPa as the volume fraction of porosity decreases from 78.9% to 39.3%. Moreover, our data shows that the influence of porosity on the relative yield stress and relative Young’s modulus conformsto the scaling equations of Gibson and Ashby as formulated for open-cell porous metals. The pore cell characteristics anddeformation modes of porous Cu produced by de-alloying Cu–Fe alloys were discussed in the context of the observed fluctuationsin the value of the constants C and n in the Gibson-Ashby scaling equation. The evolution of microstructure duringcompressive deformation of porous Cu was studied and the results reveal an increase in the fraction of low-angle grainboundaries, an increase in the number of twins and a decrease in the average grain size with increasing strain from 0% to 70%.
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