检索结果-南通市图书馆

Rare Metals 2021年第4期40卷 939-951页

作者： Ya-Kai Zhang ze-qin cui Dian-qing Gong Wen-Xian Wang Wei-Li Cheng School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024China Shanxi Province Boiler and Pressure Vessel Supervision and Inspection Institute Taiyuan 030024China

Ideal biodegradable materials exhibit suitable degradation rates and sufficient mechanical properties for their specific *** these parameters in mind,Zn-Mg/Mg-Zn-hydroxyapatite(HAp) laminated composites were designed and fabricated by spark plasma *** paper describes the structure,mechanical properties,in vitro corrosion resistance,and cytotoxicity of the Zn-Mg/Mg-Zn-HAp laminated *** compressive strength and elastic moduli of the laminated composites matched that of cortical bone and could effectively reduce the stress shielding effect as an implant with good biomechanical *** of the fracture path and morphology after fracture toughness tests indicated that the Zn-Mg/Mg-Zn-HAp laminated composites exhibited significant capacity to prevent crack propagation,improving the fracture *** vitro degradation experiments showed that the design of the laminated structure can provide a gradient degradation rate for the ***,the laminated composites exhibited excellent biocompatibility and are promising candidates for orthopedic implants.

关键词： Laminated composites Zn-Mg composites Spark plasma sintering Microstructure Fracture behavior In vitro degradation Cytotoxicity

Role of micro-Ca/In alloying in tailoring the microstructural characteristics and discharge performance of dilute Mg-Bi-Sn-based alloys as anodes for Mg-air batteries

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Journal of Magnesium and Alloys 2024年第1期12卷 251-266页

作者： Fei-er Shangguan Wei-li Cheng Yu-hang Chen ze-qin cui Hui Yu Hong-xia Wang Li-fei Wang Hang Li Hua Hou School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China

The influence of micro-Ca/In alloying on the microstructural charac teristics,electrochemical behaviors and discharge properties of extruded dilute Mg-0.5Bi-0.5Sn-based(wt.%)alloys as anodes for Mg-air batteries are *** grain size and texture intensity of the Mg-Bi-Sn-based alloys are significantly decreased after the Ca/In alloying,particularly for the In-containing *** that,in addition to nanoscale Mg_(3)Bi_(2)phase,a new microscale Mg_(2)Bi_(2)Ca phase forms in the Ca-containing *** electrochemical test results demonstrate that Ca/In micro-alloying can enhance the electrochemical *** In to alloy the Mg-Bi-Sn-based alloy is effective in restricting the cathodic hydrogen evolution(CHE)kinetics,leading to a low self-corrosion rate,while severe CHE occurred after Ca *** micro-alloying of Ca/In to Mg-Bi-Sn-based alloy strongly deteriorates the compactness of discharge products film and mitigates the"chunk effect"(CE),hence the cell voltage,anodic efficiency as well as discharge capacity are greatly *** In-containing alloy exhibits outstanding discharge performance under the combined effect of the modified microstructure and discharge products,thus making it a potential anode material for primary Mg-air battery.

关键词： Mg-air batteries Mg-Bi-Sn based alloys Electrochemical behaviors Discharge properties

Tailoring the microstructure and improving the discharge properties of dilute Mg-Sn-Mn-Ca alloy as anode for Mg-air battery through homogenization prior to extrusion

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Journal of Materials Science & Technology 2021年第1期60卷 77-89页

作者： Xiong-jie Gu Wei-li Cheng Shi-ming Cheng Yan-hui Liu Zhi-feng Wang Hui Yu ze-qin cui Li-fei Wang Hong-xia Wang School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Advanced Magnesium-Based Materials Taiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China

Mg-0.5Sn-0.5Mn-0.5Ca(wt.%) alloys with different microstructures are designed through casting and extrusion with and without homogenization treatment prior to extrusion(HPE).The influence of HPE treatment on the microstructural characteristics and resultant discharge properties of Mg-Sn-Mn-Ca alloy in extruded condition as anode for Mg-air battery was *** treatment exerts a prominent effect on the grain structure and orientation,distribution of the second phase particles as well as the dislocation density of the extruded *** HPE alloy exhibits a distinctly high cell voltage together with specific energy compared with that of Non-HPE *** discharge tests confirm that the HPE alloy possesses a more excellent discharge activity and more stable discharge process than the NonHPE *** results demonstrate that the HPE alloy is an attractive anode material for Mg-air battery with long-term storage and under intermittent discharge.

关键词： Mg-air battery Homogenization prior to extrusion Microstructure Discharge property Intermittent discharge

Laser surface melting AZ31B magnesium alloy with liquid nitrogen-assisted cooling

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Transactions of Nonferrous Metals Society of China 2015年第5期25卷 1446-1453页

作者：崔泽琴施海霞王文先许并社太原理工大学材料科学与工程学院太原030024 太原理工大学新材料界面科学与工程教育部重点实验室太原030024

Laser surface melting（LSM） is a high-energy surface treatment that allows modification of the microstructure and surface properties of Mg alloys. In the present work, an attempt of LSM on magnesium alloy with liquid nitrogen-assisted cooling（LNSC） was carried out to get the higher cooling rate and improve the surface properties. The experimental results were compared with those of Ar gas protection at room temperature. The samples after LSM with LNSC resulted in a thinner melted layer, a highly homogeneous, refined melted microstructure and formed a lot of worm-like nanocrystals and local amorphous structures. Microhardness of the melted layer with LNAC was improved to HV 90-148 as compared to HV 65-105 of the samples with Ar gas protection. The corrosion resistance of the melted layer in a 3.5% Na Cl solution（mass fraction） was improved because of the grain refinement and redistribution of β-Mg17Al12 phases following rapid quenching associated with the process.

关键词： magnesium alloy laser surface melting liquid nitrogen-assisted cooling microhardness corrosion resistance

Effects ofslip mode on microstructure evolution and compressive flow behavior of extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy

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Transactions of Nonferrous Metals Society of China 2024年第11期34卷 3599-3614页

作者： Zhi-yong YOU Wei-li CHENG Guo-lei LIU Jian LI Li-fei WANG Hui YU Hong-xia WANG ze-qin cui Jin-hui WANG School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Salt Lake Chemical Engineering Research Complex Qinghai UniversityXining 810016China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China

The influence of the slip mode on the microstructure evolution and compressive flow behavior at different strains in an extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy was analyzed through electron backscatter diffraction,X-ray diffraction,transmission electron microscopy,and hot compression *** results showed that at a low strain of 0.05,the basal,pyramidalandslip modes were simultaneously ***,at the middle stage of deformation(strain of 0.1,0.2 and 0.5),theslip mode was difficult to be activated andslip mode became *** deformation process between strains of 0.2 and 0.5 was primarily characterized by the softening effect resulting from the simultaneous occurrence of continuous dynamic recrystallization and discontinuous dynamic ***,at strain of 0.8,a dynamic equilibrium was established,with the flow stress remaining constant due to the interplay between the dynamic softening brought about by discontinuous dynamic recrystallization and the work-hardening effect induced by the activation of the basalslip mode.

关键词： dilute Mg−Bi−Sn−Mn alloy slip mode hot compression flow behavior dynamic recrystallization

Fatigue behavior of AZ31B magnesium alloy electron beam welded joint based on infrared thermography

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Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2595-2602页

作者：杨宏伟崔泽琴王文先许并社许海鹰太原理工大学材料科学与工程学院太原030024 先进镁基材料山西省重点实验室太原030024 北京航空制造工程研究所北京100024

Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechanism of heat generationwas discussed. Fatigue limit of the welded joint was predicted and the fatigue damage was also assessed based ontheevolution of the temperatureand hotspot zone on the specimen surfaceduring fatigue tests. The presented results show that infrared thermography can not onlyquicklypredict the fatigue behavior of the welded joint, but also qualitatively identify the evolution of fatigue damage in real time. It is found that the predicted fatigue limit agrees well with the conventionalS-Nexperimental results. The evolution of the temperatureand hotspot zone on the specimen surface can be an effectivefatigue damage indicatorfor effectiveevaluationof magnesium alloy electron beam welded joint.

关键词： magnesium alloy electron beam welded joint fatigue behavior infrared thermography

Small Prime Solutions of a Pair of Linear Equations in Five Prime Variables

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Acta Mathematica Sinica,English Series 2010年第3期26卷 569-578页

作者： Zhen cui Hong ze LI Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 P. R. China

Assume an additional congruent condition on the coefficients. We prove that the pair 5 of linear equations ∑j=1^5 αλjpj = bλ （λ= 1, 2） has solutions in primes pj satisfying pj 〈〈（｜b1｜＋｜b2｜＋1） maxλ,j ｜αλj｜^2318＋ε. This improves the exponent 79680 without assuming the additional condition of the second author＇s.

关键词： Diophantine equations Deuring-Heilbronn phenomenon large sieve inequality zero-free region

Quasiprobability Distribution of Squeezed Thermal Spin States in Ferromagnet

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Communications in Theoretical Physics 2008年第3期49卷 777-782页

作者： XU qin-Feng CHENG ze Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We study squeezed properties of magnon squeezed thermal spin states by using the distribution of Q function in the ferromagnet. It is found that the distribution of Q function strongly depends on the temperature T and coupling parameter γ. Below the transition temperature Tc, the distribution Q function in the squeezed thermal spin state presents a richer structure than in the normal state. Non-classical effects have been observed. In the transition from the normal to the squeezed thermal spin state, the phase symmetry of the magnon system is spontaneously broken.

关键词： squeezed thermal spin state ferromagnon quasiprobability distribution function

Microstructure evolution and its effect on mechanical properties of cast Ti48Al6NbxSi alloys

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China Foundry 2020年第6期17卷 416-422页

作者： qin Xu Hong-ze Fang Chao Wu Qi Wang Hong-zhi cui Rui-run Chen School of Mechanical and Electrical Engineering Henan University of TechnologyZhengzhou 450001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

In order to improve mechanical properties of TiAlNb alloys,different contents of silicon were added into Ti48Al6Nb *** Ti48Al6NbxSi (x=0,0.1,0.2,0.3,0.4 and 0.5,at.%) alloys were prepared by vacuum arc *** phase constitution,microstructure evolution and mechanical properties of the alloys were *** show that the Ti48Al6NbxSi alloys consist of γ-TiAl phase,α2-Ti3Al phase and B2 phase,and Ti5Si3 silicide phase is formed when the addition of silicon is higher than 0.3at.%.The addition of silicon leads to the decrease in γ phase and increase in α2 *** formation of silicide decreases the amount of Nb dissolved in the TiAl matrix,and therefore decreases B2 *** tests show that the ultimate strength of the alloys increases from 2,063 MPa to 2,281 MPa with an increase in silicon from 0 to 0.5at.%,while the fracture strain decreases from 34.7% to 30.8%.The increase of compressive strength and decrease of fracture strain can be attributed to the decrease of B2 phase and the formation of Ti5Si3 phase by the addition of *** strengthening mechanism is changed from solid solution strengthening when the addition of silicon is less than 0.3at.% to combination of solid solution strengthening and secondary phase strengthening when the addition of silicon is higher than 0.3at.%.

关键词： TiAl-based alloy microstructure mechanical property strengthening

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辐照蘑菇人体试食试验

卫生研究 1988年第4期 32-36页

作者：韩驰郭世萍王茂起刘泽嵚崔文明戴寅中国预防医学科学院营养与食品卫生研究所卫生部食品卫生监督检验所

以双盲法60Co辐照蘑菇（吸收剂量为1.0KGY）对19名志愿者（男9名女10名）年龄21～40岁,进行了人体试食试验。将受试者按性别、年龄随机配对分成试验组和对照组,每日食用蘑菇250g,试验期28天,在此之前14天适应期食用非辐照蘑菇。辐照蘑... 详细信息

以双盲法60Co辐照蘑菇（吸收剂量为1.0KGY）对19名志愿者（男9名女10名）年龄21～40岁,进行了人体试食试验。将受试者按性别、年龄随机配对分成试验组和对照组,每日食用蘑菇250g,试验期28天,在此之前14天适应期食用非辐照蘑菇。辐照蘑菇在室温储存24小时后食用。试食期没有不良影响,对造血、肝、肾功能、血脂、血糖和内分泌功能试验组与对照相比两组没有显著性差异。外周淋巴细胞染色体畸变分析表明:试验组女性试食后染色体畸变率明显增加,而对照组与试食组于试食期后两组相比亦有明显差异。然而,染色体畸变率偏低,且均在正常范围内。同时,受试人数较少,因此所观察到的畸变率增加可能由于分析的系统误差所致,并非辐照蘑菇所致。

关键词：辐照蘑菇人体试食试验染色体畸变分析