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Nano-SiC reinforced Zn biocomposites prepared via laser melting:Microstructure,mechanical properties and biodegradability

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Journal of Materials Science & Technology 2019年第11期35卷 2608-2617页

作者： Chengde Gao Meng Yao Cijun Shuai Shuping Peng Youwen Deng State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Jiangxi University of Science and Technology Ganzhou 341000China Shenzhen Institute of Information Technology Shenzhen 518172China NHC Key Laboratory of Carcinogenesis and The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Xiangya HospitalCentral South UniversityChangsha 410013China Cancer Research Institute School of Basic Medical SciencesCentral South UniversityChangsha 410011China Department of Emergency The Second Xiangya Hospital of Central South UniversityChangsha 410011China

Zn has been regarded as new kind of potential implant biomaterials due to the desirable biodegradability and good biocompatibility,but the low strength and ductility limit its application in bone *** the present study,nano-SiC was incorporated into Zn matrix via laser melting,aiming to improve the mechanical *** microstructure analysis showed that nano-SiC distributed along Zn grain *** the laser rapid solidification,nano-SiC particles acted as the sites for heterogeneous nucleation,which resulted in the reduction of Zn grain size from 250μm to 15μm with 2 wt%SiC(Zn-2 SiC).Meanwhile,nano-SiC acted as a reinforcer by virtue of Orowan strengthening and dispersion *** a consequence,the nanocomposites showed maximal compressive yield strength(121.8±5.3 MPa)and high microhardness(72.24±3.01 HV),which were increased by 441%and 78%,respectively,compared with pure ***,fracture analysis indicated a more ductile fracture of the nanocomposites after the incorporation of nano-SiC In addition,the nanocomposites presented favorable biocompatibility and accelerated degradation caused by intergranular *** findings suggested that the nano-SiC reinforced Zn biocomposites may be the potential candidates for orthopedic implants.

关键词： Zn Nano-SiC Biocomposites laser melting Mechanical properties

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Competition Growth of α and β Phases in Ti-50 at.%Al Peritectic Alloy during the Rapid Solidification by laser melting Technique

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Acta Metallurgica Sinica(English Letters) 2013年第5期26卷 523-532页

作者： Wenjing YAO Xiuling NIU Long ZHOU Nan WANG Jehyun LEE The Key Laboratory of Space Applied Physics and Chemistry Ministry of Education School of Science Northwestern Polytechnical University Engineering Research Center for Integrated Mechatronics Materials and Components Changwon National University92 Toechon-ro Uichang-gu Changwon-si

Rapid solidification of Ti-50 at.%Al peritectic alloy is realized by laser melting technique at diferent conditions of laser power and scanning speed. The temperature field and the cooling rate under the corresponding conditions are derived from the finite element simulation.℃omparing the measured pool size with the simulated result, the laser absorptivity of Ti-50 at.%Al peritectic alloy at diferent conditions can be deduced to establish the relationships between the laser absorptivity, the laser power and the scanning speed. The morphology evolution and the phase selection of Ti-50 at.%Al peritectic alloy are described by the temperature gradient and the cooling rate. With the increase of temperature gradient and cooling rate, β phase replaces α phase to become the leading growth phase. And the growth of α phase experiences the transition from facet to non-facet manner, while β phase is refined. To understand the underlying mechanism of the competition growth can bring benefit to the industrial application of Ti-Al alloy.

关键词： Rapid solidification laser melting Competition growth Temperature field

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REDISTRIBUTION OF IMPURITY ATOMS AI, Si, Mn AND Cu IN Ni DURING laser melting

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Acta Metallurgica Sinica(English Letters) 1992年第7期5卷 77-81页

作者： ZHENG Ling, Chongqing Institute of Communications, Chongqing, ChinaZOU Zhirong, LIU Jianglong, Chongqing University, Chongqing, China ZHENG Ling, Lecturer, Department of Mechanical Engineering, Chongqing Institute of Communications, Chongqing 630074, China

An explanation of the redistribution of impurity atoms such as Al, Si, Mn and Cu in pure nickel during low speed laser melting is made by one-dimensional analysis model for heat transfer. The solid-liquid interface solute redistribution seems to be the principal cause that makes the impurity atoms redistribute in the depth direction. The diffusion of impurity atoms from low to high temperature zones and their surface selective evaporation are believed to be noticeably contributed to the redistribution.

关键词： Ni laser melting impurity atom redistribution

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Unique redox properties in defective CeO_(2-x) nanocrystallines synthesized by laser melting

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Science China Materials 2018年第8期61卷 1078-1084页

作者： Lu Song Jing Ma Qinghua Zhang Yidan Cao Rui Ran Zhijian Shen State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Key Lab of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Materials and Environmental Chemistry Arrhenius Laboratory Stockholm University Stockholm 10691 Sweden

Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x with hetero- geneous structure was synthesized by high-energy laser melt- ing, where a large amount of oxygen vacancies and Ce3~ could be introduced, leading to improved visible light absorption, narrowed bandgap and room temperature ferromagnetism. Moreover, this laser melted CeO2x exhibits significantly en- hanced low-temperature oxidation behaviors than the coun- terpart prepared by normal hydrogen-reduction. This unique redox performance could be attributed to the intragranular diffusion at the boundaries of assembled nanocrystallites. This method paves a new way for introducing unique multi-func- tions in oxide ceramics.

关键词： cerium oxide laser melting defect boundary redoxproperty

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Study on Camshaft Treated by Bionic laser melting Process in Aqueous Media Cooling

Study on Camshaft Treated by Bionic Laser Melting Process in...

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The 3rd International Conference of Bionic Engineering(ICBE’10)

作者： Yu Zhao 1 2 Dongxue Song 1 Luquan Ren 2 Li Chen 1 2 1 Key Laboratory of Advanced Structrural Materials Ministry of Education Changchun University of Techology Changchun 130012 China 2 Key Laboratory of Bionic Engineering (Jilin University) Ministry of Education P.R.China

Biomimetic coupling wear resistance model was created according to biomimetic coupling phenomenon and biomimetic coupling theory. The model utilize the preparation of aqueous media by laser cooling techniques and process biological coupling unit on the gray cast iron surface according to the organism form. The bionic coupled unit is made in accordance with the laws of organism combination and a bionic coupling surface which is similar to the organism form is produced with material surface which can improve the wear resistance of the camshaft. Studies show that the region treated with aqueous media by laser can get small grains with uniform size. The hardness and wear resistance is improved.

关键词： Bionic coupling laser melting Camshaft

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Oxidation resistance of Si-coated TZM alloy prepared through combined process of plasma spray and laser surface melting

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Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2603-2608页

作者： Jeong-Min KIM Tae-Hyung HA Joon-Sik PARK Hyun-Gil KIM Department of Advanced Materials Engineering Hanbat National UniversityDaejeon 34158Korea Korea Atomic Energy Research Institute Daejeon 34057Korea

Plasma thermal spraying ofSi coating layer ontitanium-zirconium-molybdenum （Ti-Zr-Mo）,TZM alloy,was conducted for the surface protection of the Mo substrate that is unstable in air at high temperatures. Although the plasma thermal spraying alone could protect the Mo alloy from oxidation at a high temperature for a short time, the post laser surface melting process further improved the oxidation resistance of Si-coated alloy. In the case of the post laser treated specimen,MoSi compounds, mainly MoSi2 phases, were formed during the additional annealing process, and the oxidation resistance could be even further enhanced. The corrosion behaviors of Si-coated specimens in 3.5%NaCl solution were also investigated;however,nosignificant variations with respect to the post treatment procedure were found.

关键词： Si Ti-Zr-Mo alloy Si oxidation plasma spray laser melting

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Effect of laser surface melting treatment on properties of electric copper busbar joints

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中国有色金属学会会刊：英文版 2001年第4期11卷 479-482页

作者：梁工英宋晓平顾林喻 Department of Materials Physics Science School Xi′an Jiaotong University Department of Materials Engineering Xi′an Institute of Technology

Electrical conductance and temperature of electric copper busbar joints were measured under different torque moments. Experimental results show that laser surface melting can increase hardness and refine structure of the copper, and it does not deteriorate electric resistance. Meanwhile, the temperature of laser treated joints under electric current is slightly lower than that of original sample. Salt spray test shows that laser treated sample has better salt spray corrosion resistance than the original sample does. The electric resistance of both laser treated and original samples are increased with salt spray time. For the same salt spray time, the electric resistance of busbar joint is decreased with increasing torque moment.

关键词： laser melting electrical copper busbar electric conductance corrosion

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MICROSTRUCTURE AND CORROSION RESISTANCE OF laser SURFACE ALLOYING PLASMA SPRAYED Cr-Mo COATING

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 261-265页

作者： LIANG Yong WANG Jun TONG Baiyun SI Zhongyao Institute of Metal Research,Academia Sinica,Shenyang,China Inst of Metal Research Acad Sinica Shenyang China

The precipitation of χ-phase,σ-phase and carbides may be restrained or eliminated by laser melting the plasma sprayed Cr-Mo alloy coating,in which austenite of abundant block usual- ly occurred on medium carbon low alloying *** corrosion resistance of this coating to 0.5mol/L H_2SO_4 was examined to be superior to that of 18-8 stainless *** laser al- loying Cr-Mo coating also has excellent resistance to pitting corrosion,and no pitting ap- peared even it immersed in a medium containing Cl^- ions.

关键词： Cr-Mo coating laser melting microstructure corrosion resistance pitting

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INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 188-193页

作者： TAO Zengyi LUO Jiaming Huazhong University of Science and Technology,Wuhan,China TAO Zengyi,Faculty of Metallic Materials,Dept.of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan 430074,China

The influence of laser surface melting and induction hardening on the surface structure,con- tact fatigue life and failure behaviour of the nodular cast iron has been *** con- tact fatigue life can be improved by both laser treatment and induction hardening,but the fail- ure process and type are different from each *** former is due to lumpy and deep spal- ling caused by crack propagation between the quenching zone and the substrate,and the latter is due to nubby and surface flaking caused by the oil wedged action into surface cracks.

关键词： surface hardening contact fatigue life laser melting induction hardening

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Effect of Cu addition on microstructural evolution and hardening of mechanically alloyed Al-Ti-O in-situ composite

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Transactions of Nonferrous Metals Society of China 2020年第5期30卷 1135-1147页

作者： A.S.PROSVIRYAKOV A.I.BAZLOV I.S.LOGINOVA Department of Physical Metallurgy of Non-Ferrous Metals National University of Science and Technology“MISiS”Leninskiy Prospect 4Moscow 119049Russia

The microstructure formation and strengthening of an Al-5 wt.%TiO2 composites with additions of 5 wt.%Cu and 2 wt.% stearic acid(as a process control agent, PCA) during mechanical alloying and subsequent thermal exposure were studied. The powder composites were prepared by high-energy ball milling for up to 10 h. Single line tracks of the powders were laser melted. Optical and scanning electron microscopy, XRD analysis and differential scanning calorimetry were used to study microstructural evolution. The results showed that the Cu addition promotes an effective mechanical alloying of aluminum with Ti O2 from the start of milling, resulting in higher microhardness(up to HV 290), while the PCA, on the contrary, postpones this process. In both cases, the composite granules with uniform distribution of Ti O2 particles were formed. Subsequent heating of mechanically alloyed materials causes the activation of an exothermic reaction of Ti O2 reduction with aluminum, the start temperature of which, in the case of Cu addition,shifts to lower values, that is, the transformation begins in the solid state. Besides, the Cu-added material after laser melting demonstrates a more dispersed and uniform structure which positively affects its microhardness.

关键词： mechanical alloying Al-Ti-O system aluminum matrix composites microstructure hardening laser melting

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