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Interactions of Shear Bands in a Ductile Metallic Glass

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Journal of Iron and Steel Research International 2016年第1期23卷 48-52页

作者： Li-shan HUO jun-qiang wang jun-tao HUO Yuan-yun ZHAO He MEN Chun-tao CHANG Xin-min wang Run-wei LI Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology & EngineeringChinese Academy of Sciences Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & EngineeringChinese Academy of Sciences

Shear bands play a key role in the plastic deformation of metallic glasses（MGs）.Even though there are extensive studies on the initiation and propagation of shear bands,the interactions among them have not been systematically studied *** interactions between the primary shear bands（PSBs）and secondary shear bands（SSBs）in a ductile Zr-based MG were *** residual stress near PSBs can deflect the propagation direction and reduce the propagation velocity of SSBs,which contributes to the plasticity and toughness of the *** was demonstrated that the probability and strength of the interactions between PSBs and SSBs would become stronger for MGs with larger Young′s modulus and smaller shear modulus,i.e.,larger Poisson′s *** results are valuable in understanding the plastic deformation of MGs and may be helpful in designing new MGs with desirable mechanical properties.

关键词： bulk metallic glass shear band interaction plasticity serration

Relating microstructure to magnetocaloric properties in RE_(36)Tb_(20)Co_(20)Al_(24)(RE=Gd,Dy or Ho)high-entropy metallic-glass microwires designed by binary eutectic clusters method

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Journal of Materials Science & Technology 2023年第18期149卷 167-176页

作者： Hangboce Yin jun-qiang wang Yongjiang Huang Hongxian Shen Shu Guo Hongbo Fan juntao Huo Jianfei Sun School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Center for Analysis Measurement and Computing Harbin Institute of TechnologyHarbin 150001China Space Environment Simulation Research Infrastructure Harbin Institute of TechnologyHarbin 150001China

The new high-entropy metallic-glasses(HE-MGs)are designed by using Dy and Ho to replace Gd in Gd_(36)Tb_(20)Co_(20)Al_(24)alloy based on the binary eutectic clusters *** with the equiatomic Gd 25 Tb 25 Co 25 Al 25 HE-MG,the non-equiatomic RE_(36)Tb_(20)Co_(20)Al_(24)(RE=Gd,Dy,or Ho)alloys show bet-ter glass-forming ability,which is attributed to the deep binary eutectic compositions used for alloy *** RE_(36)Tb_(20)Co_(20)Al_(24)alloys undergo second-order magnetic *** extreme peak value of magnetic entropy change is obtained as 10.3 J kg^(-1) K-1(5 T)for the Ho_(36)Tb_(20)Co_(20)Al_(24)***-situ high-energy synchrotron X-ray diffraction was conducted to observe the microstructural difference among non-equiatomic samples at cryogenic *** results indicate that Gd_(36)Tb_(20)Co_(20)Al_(24)alloy possesses a relatively large average value of the dispersion of local clusters at a low-temperature ***,com-bined with the critical exponentβclose to 0.5 of Gd_(36)Tb_(20)Co_(20)Al_(24)alloy,leads to its widest working temperature span among non-equiatomic *** work successfully establishes the connection be-tween microstructure and magnetocaloric properties of HE-MGs,which is beneficial for understanding the physical mechanism of the magnetocaloric behaviors of HE-MGs.

关键词： High-entropy metallic-glass Magnetocaloric effect High energy synchrotron X-ray diffraction Cryogenic temperature

Function of chloride intracellular channel 1 in gastric cancer cells

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World Journal of Gastroenterology 2012年第24期18卷 3070-3080页

作者： Peng-Fei Ma jun-qiang Chen Zhen wang Jin-Lu Liu Bo-Pei Li Department of Gastrointestinal Surgery the First Affili- ated Hospital of Guangxi Medical University Nanning 530021 Guangxi Zhuang Autonomous Region China

AIM:To investigate the effect of chloride intracellular channel 1(CLIC1) on the cell proliferation,apoptosis,migration and invasion of gastric cancer ***:CLIC1 expression was evaluated in human gastric cancer cell lines SGC-7901 and MGC-803 by real time polymerase chain reaction(RT-PCR).Four segments of small interference RNA(siRNA) targeting CLIC1 mRNA and a no-sense control segment were designed by bioinformatics ***1 siRNA was selected using Lipofectamine 2000 and transfected transiently into human gastric cancer SGC-7901 and MGC-803 *** transfected efficiency was observed under fluorescence *** transfection,mRNA expression of CLIC1 was detected with RT-PCR and Western blotting was used to detect the protein *** was examined by methyl thiazolyl tetrazolium and apoptosis was detected with flow *** membrane transwell chamber and Matrigel were used for the detection of the changes of invasion and migration of the two cell ***:In gastric cancer cell lines SGC-7901 and MGC-803,CLIC1 was obviously expressed and CLIC1 siRNA could effectively suppress the expression of CLIC1 protein and *** of cells transfected with CLIC1 siRNA3 was enhanced notably,and the highest proliferation rate was 23.3%(P = 0.002) in SGC-7901 and 35.55%(P = 0.001) in MGC-803 cells at 48 *** G2/M phase proportion increased,while G0/G1 and S phase proportions *** apoptotic rate of the CLIC1 siRNA3 group obviously decreased in both SGC-7901 cells(62.24%,P = 0.000) and MGC-803 cells(52.67%,P = 0.004).Down-regulation of CLIC1 led to the inhibition of invasion and migration by 54.31%(P = 0.000) and 33.62%(P = 0.001) in SGC-7901 and 40.74%(P = 0.000) and 29.26%(P = 0.002) in ***,there was no significant difference between the mock group cells and the negative control group cells.

关键词： Chloride intracellular channel 1 Gastric car-cinoma Small interference RNA Apoptosis Invasion Migration

High-precision nuclear magnetic resonance probe suitable for in situ studies of high-temperature metallic melts

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Chinese Physics B 2022年第4期31卷 48-55页

作者： Ao Li Wei Xu Xiao Chen Bing-Nan Yao jun-Tao Huo jun-qiang wang Run-Wei Li CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-temperature nuclear magnetic resonance(NMR)has proven to be very useful for detecting the temperatureinduced structural evolution and dynamics in ***,the sensitivity and precision of high-temperature NMR probes are *** we report a sensitive and stable high-temperature NMR probe based on laser-heating,suitable for in situ studies of metallic melts,which can work stably at the temperature of up to 2000 *** our design,a well-designed optical path and the use of a water-cooled copper radio-frequency(RF)coil significantly optimize the signal-to-noise ratio(S/NR)at high ***,a precise temperature controlling system with an error of less than±1 K has been *** temperature calibration,the temperature measurement error is controlled within±2 *** a performance testing,^(27)Al NMR spectra are measured in Zr-based metallic glass-forming liquid in *** show that the S/NR reaches 45 within 90 s even when the sample's temperature is up to 1500 K and that the isothermal signal drift is better than0.001 ppm per *** high-temperature NMR probe can be used to clarify some highly debated issues about metallic liquids,such as glass transition and liquid-liquid transition.

关键词： high-temperature NMR probe laser beams temperature measurement metallic melts

Influence of thermal history on the crystallization behavior of high-Bs Fe-based amorphous alloys

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 173-180页

作者： Bowen Zang Lijian Song Richard Parsons Jie Shen Meng Gao Yan Zhang juntao Huo Yonghao Sun Fushan Li Kiyonori Suzuki jun-qiang wang Weihua wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Materials Science and Engineering Monash UniversityClayton VIC 3800Australia Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

A crucial step in creating cutting-edge soft magnetic alloys is the nanocrystallization of Fe-based amorphous ***,it is unclear how the thermal history affects the *** this work,high-precision nanocalorimetry and in-situ hightemperature transmission electron microscopy are used to systematically examine how the pre-annealing relaxation process affects the nanocrystallization of Fe-based amorphous *** discover that the glass with more thermal energy storage will crystallize into superb nanocrystalline structures with exceptionally advanced soft *** soft magnetic properties of Fe-B nanocrystalline alloys can be improved by increasing the relaxation *** finding provides solid and clear evidence for the influences of thermal history on crystallization behavior for Fe-based amorphous alloys,which is helpful for designing advanced soft magnetic nanocrystalline alloys.

关键词： amorphous alloys enthalpy relaxation nanocrystallization microstructure development soft magnetic properties

Small activation entropy bestows high-stability of nanoconfined D-mannitol

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Chinese Physics B 2021年第7期30卷 376-381页

作者： Lin Cao Li-Jian Song Ya-Ru Cao Wei Xu jun-Tao Huo Yun-Zhuo Lv jun-qiang wang School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of Sciences(CAS)Ningbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

It has been a long-standing puzzling problem that some glasses exhibit higher glass transition temperatures(denoting high stability)but lower activation energy for relaxations(denoting low stability).In this paper,the relaxation kinetics of the nanoconfined D-mannitol(DM)glass was studied systematically using a high-precision and high-rate *** nanoconfined DM exhibits enhanced thermal stability compared to the free *** example,the critical cooling rate for glass formation decreases from 200 K/s to below 1 K/s;the Tg increases by about 20 K–50 *** relaxation kinetics is analyzed based on the absolute reaction rate *** is found that,even though the activation energy E^(*)decreases,the activation entropy S^(*)decreases much more for the nanoconfined glass that yields a large activation free energy G^(*)and higher thermal *** results suggest that the activation entropy may provide new insights in understanding the abnormal kinetics of nanoconfined glassy systems.

关键词： D-mannitol glass confinement relaxation activation entropy

Unexpected non-monotonic changing in the heterogeneity of glasses during annealing

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Journal of Materials Science & Technology 2024年第10期177卷 96-102页

作者： Yu Tong Fucheng Li Lijian Song Yanhui Liu juntao Huo Jichao Qiao Yao Yao JMPelletier Daniel Crespo Eloi Pineda jun-qiang wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China Mateis UMR CNRS5510INSA-LyonUniversitéde LyonVilleurbanne cedex F-69621France Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain

The heterogeneity of glasses has critical influences on the *** heterogeneity evolves during annealing is an intriguing cutting-edge *** this work,the heterogeneity of the annealed metal-lic and polymer glasses has been studied systematically by using stress relaxation and nanoindentation *** stress relaxation processes are analyzed using Kohlrausch-Williams-Watts(KWW)*** surprisingly find that the heterogeneous factor βkww in KWW equation does not change monotonously but increases first and then decreases along with the annealing *** two-stage process implies that glasses do not evolve as expected toward the more homogeneous glassy state but become homogeneous first and then more *** is further verified by the evolution of critical shear stress for local *** is revealed that the two-stage process is correlated with different relaxation modes,which is further interpreted using a phenomenological *** findings not only give insights into understanding the nature of glasses,but also are useful for designing glasses with superior properties.

关键词： Glasses Heterogeneity Aging Relaxation

Emerging progress: photochemical transformation of nitroso compounds

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Science China Chemistry 2025年第1期68卷 118-133页

作者： Ze-Le Chen qiang-qiang Li Armido Studer jun Xuan Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials School of Chemistry & Chemical Engineering Anhui University Organisch-Chemisches Institut Universitat Münster

Nitroso compounds have emerged as highly valuable reaction partners or reagents in organic synthesis due to their rich *** versatile profile of these compounds allows them to function as electrophiles, nucleophiles, diradicals, and radical acceptors in diverse transformations. In recent years, notable progress has been made in harnessing photochemical reactions with nitroso compounds to prepare N,O-containing structures using mild and eco-friendly conditions. Various nitroso compounds like nitrosoarenes, acyloxy nitroso compounds, N-nitrosoamines and nitrites have received significant attention for their ability to introduce NO moieties into complex molecules that are otherwise difficult to access. In this review, we provide an overview of the recent advancements in the visible light-induced conversion of nitroso compounds, with particular emphasis on their role as bifunctional reagents and acceptors of radicals, carbenes and nitrenes.

关键词： nitroso compounds photochemistry radical reaction carbene transformation nitrosoarenes

Realization of Rapid Debugging for Detection Circuit of Optical Fiber Gas Sensor： Using an Analog Signal Source

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Photonic Sensors 2015年第1期5卷 91-96页

作者： Changbin TIAN jun CHANG qiang wang Wei WEI Cunguang ZHU School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology andApplication Shandong University Jinan 250100 China

An optical fiber gas sensor mainly consists of two parts： optical part and detection circuit. In the debugging for the detection circuit, the optical part usually serves as a signal source. However, in the debugging condition, the optical part can be easily influenced by many factors, such as the fluctuation of ambient temperature or driving current resulting in instability of the wavelength and intensity for the laser; for dual-beam sensor, the different bends and stresses of^the optical fiber will lead to the fluctuation of the intensity and phase; the intensity noise from the collimator, coupler, and other optical devices in the system will also result in the impurity of the optical part based signal source. In order to dramatically improve the debugging efficiency of the detection circuit and shorten the period of research and development, this paper describes an analog signal source, consisting of a single chip microcomputer （SCM）, an amplifier circuit, and a voltage-to-current conversion circuit. It can be used to realize the rapid debugging detection circuit of the optical fiber gas sensor instead of optical part based signal source. This analog signal source performs well with many other advantages, such as the simple operation, small size, and light weight.

关键词： Optical fiber gas sensor detection circuit analog signal source rapid debugging