Pub Date : 2017-07-17DOI: 10.1504/IJNM.2017.10005592
L. Hourng, C. Liu, Z. Fen
Helical tools have been proven to enhance the circulation of electrolyte between electrodes in electrochemical micro-drilling. However, the fabrication of micro helical tools is difficult by traditional machining methods. The aim of the present article is to fabricate a helical tungsten micro pin by electrochemical machining. Experimental results show that a helical pin can only be fabricated in the limiting current conditions, and the length of threaded region is proportional to the anode rotating rate. Under the conditions of applied voltage equal to 2.6 V, machining time of two minutes, and the anode rotating rate of 4,000 rpm, an optimal micro helical electrode with thread depth around 17 micro-metre can be obtained. The mechanism for the formation of helical groove is well explained.
{"title":"Fabrication of helical micro pins by electrochemical machining","authors":"L. Hourng, C. Liu, Z. Fen","doi":"10.1504/IJNM.2017.10005592","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10005592","url":null,"abstract":"Helical tools have been proven to enhance the circulation of electrolyte between electrodes in electrochemical micro-drilling. However, the fabrication of micro helical tools is difficult by traditional machining methods. The aim of the present article is to fabricate a helical tungsten micro pin by electrochemical machining. Experimental results show that a helical pin can only be fabricated in the limiting current conditions, and the length of threaded region is proportional to the anode rotating rate. Under the conditions of applied voltage equal to 2.6 V, machining time of two minutes, and the anode rotating rate of 4,000 rpm, an optimal micro helical electrode with thread depth around 17 micro-metre can be obtained. The mechanism for the formation of helical groove is well explained.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"235"},"PeriodicalIF":0.0,"publicationDate":"2017-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45895156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004723
Changsheng Li, Shuming Yang, Chenying Wang, Lin Sun, Zhuangde Jiang
Currently, the x, y scale and the orthogonality of atomic force microscopy (AFM) was independently calibrated by the traditional in-plane calibration methods. There exist theoretical errors because the other two error terms are neglected during the calibration of a certain error term. It has been found that the traditional calibration methods have a rather big theoretical error which is unbearable for nanometrology. In this paper, we propose a calibration method based on multi-measurement of a one-dimensional grating. The x, y scale and the orthogonality can be calibrated simultaneously. This new calibration method was also modified to eliminate the effect of AFM drift by keeping the parallelism between the slow scan direction of AFM and the grating lines of the one-dimensional grating.
{"title":"In-plane calibration for AFM","authors":"Changsheng Li, Shuming Yang, Chenying Wang, Lin Sun, Zhuangde Jiang","doi":"10.1504/IJNM.2017.10004723","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004723","url":null,"abstract":"Currently, the x, y scale and the orthogonality of atomic force microscopy (AFM) was independently calibrated by the traditional in-plane calibration methods. There exist theoretical errors because the other two error terms are neglected during the calibration of a certain error term. It has been found that the traditional calibration methods have a rather big theoretical error which is unbearable for nanometrology. In this paper, we propose a calibration method based on multi-measurement of a one-dimensional grating. The x, y scale and the orthogonality can be calibrated simultaneously. This new calibration method was also modified to eliminate the effect of AFM drift by keeping the parallelism between the slow scan direction of AFM and the grating lines of the one-dimensional grating.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"185"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45058313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004721
I. Bu, L. Kao
In this paper a simple and inexpensive method of preparing carbon-based nanomaterials via Co catalyst has been demonstrated. It was shown by using various optical and structural characterisations that well-graphitised carbon nano spheres can be prepared through the proposed process. Through the data extracted from Raman spectra it was found that the as deposited samples showed much lower Id/Ig than previously reported candle-synthesised carbon nanomaterials. Furthermore, under optimised condition, it was found that low resistivity sample can be produced which could be potentially useful in applications as counter electrode in dye sensitise solar cells.
{"title":"Flame synthesis of highly graphitic carbon nano-sphere using cobalt-based catalyst","authors":"I. Bu, L. Kao","doi":"10.1504/IJNM.2017.10004721","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004721","url":null,"abstract":"In this paper a simple and inexpensive method of preparing carbon-based nanomaterials via Co catalyst has been demonstrated. It was shown by using various optical and structural characterisations that well-graphitised carbon nano spheres can be prepared through the proposed process. Through the data extracted from Raman spectra it was found that the as deposited samples showed much lower Id/Ig than previously reported candle-synthesised carbon nanomaterials. Furthermore, under optimised condition, it was found that low resistivity sample can be produced which could be potentially useful in applications as counter electrode in dye sensitise solar cells.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"161"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48299163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Janus hybrids, the anisotropic materials, have displayed very strong potentials in diverse research fields like life science and photology due to their unique properties. In this study, using graphene as an efficient nanoparticles (NPs) carrier, we present the fabrication of two-dimensional (2D) Janus hybrids (gold NPs/graphene) superstructures through a rapid, solventless sputtering method in 10-30 seconds. The micropores in graphene (~0.5 nm) is much smaller than the sputtered gold NPs, which can allow the sheet material to mesh gold NPs in one side to form a Janus structure. The size and morphology of gold NPs can be fine controlled on graphene by adjusting the sputtering current and time, while the resulting graphene hybrids enjoy tunable NPs area density and desirable thermal stability. The performance of hybrids has also been explored through standard electrochemical experiments.
{"title":"Fabrication of Janus graphene hybrids with controlled structure and high stability","authors":"Yaling Li, Jiao Wu, Kun Qian, Jingjing Wan, Ying Wang, Baohong Liu, Xiaojing Zhang","doi":"10.1504/IJNM.2017.10004719","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004719","url":null,"abstract":"Janus hybrids, the anisotropic materials, have displayed very strong potentials in diverse research fields like life science and photology due to their unique properties. In this study, using graphene as an efficient nanoparticles (NPs) carrier, we present the fabrication of two-dimensional (2D) Janus hybrids (gold NPs/graphene) superstructures through a rapid, solventless sputtering method in 10-30 seconds. The micropores in graphene (~0.5 nm) is much smaller than the sputtered gold NPs, which can allow the sheet material to mesh gold NPs in one side to form a Janus structure. The size and morphology of gold NPs can be fine controlled on graphene by adjusting the sputtering current and time, while the resulting graphene hybrids enjoy tunable NPs area density and desirable thermal stability. The performance of hybrids has also been explored through standard electrochemical experiments.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"139"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41488459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004717
C. Nick, H. Schlaak, C. Thielemann
Improving the neuron-electrode interface has been a focus of biomedical research for the last decade. Low impedance, high charge storage capacities and small geometrical surface area are desired for excellent recording conditions. A common way to improve this interface is to increase the electrochemically active surface area of the electrode using nanoporous or nanostructured electrode materials. In this paper, the fabrication of microelectrodes with very high aspect ratio gold nanopillars coated with the conducting polymer PEDOT:PSS is presented. The electrodes are simulated, manufactured and studied using scanning electron microscopy, atomic force microscopy, impedance spectroscopy, cyclic voltammetry and neural cell culture experiments. We show that PEDOT:PSS coated nanopillar electrodes have improved capacity, reduced impedance and in-vitro recordings reveal high signal-to-noise ratio. Depending on pillar height the impedance is more than 350 times smaller compared to planar gold electrodes at 1 kHz and reveals an electrode capacity more than 1,000 times higher.
{"title":"PEDOT:PSS coated Gold Nanopillar Microelectrodes with Ultralow Impedance for Neural Interfaces","authors":"C. Nick, H. Schlaak, C. Thielemann","doi":"10.1504/IJNM.2017.10004717","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004717","url":null,"abstract":"Improving the neuron-electrode interface has been a focus of biomedical research for the last decade. Low impedance, high charge storage capacities and small geometrical surface area are desired for excellent recording conditions. A common way to improve this interface is to increase the electrochemically active surface area of the electrode using nanoporous or nanostructured electrode materials. In this paper, the fabrication of microelectrodes with very high aspect ratio gold nanopillars coated with the conducting polymer PEDOT:PSS is presented. The electrodes are simulated, manufactured and studied using scanning electron microscopy, atomic force microscopy, impedance spectroscopy, cyclic voltammetry and neural cell culture experiments. We show that PEDOT:PSS coated nanopillar electrodes have improved capacity, reduced impedance and in-vitro recordings reveal high signal-to-noise ratio. Depending on pillar height the impedance is more than 350 times smaller compared to planar gold electrodes at 1 kHz and reveals an electrode capacity more than 1,000 times higher.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"109"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42227270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004718
Xiaoguang Guo, Changheng Zhai, R. Kang, D. Guo
Three-dimensional molecular dynamics simulations are conducted to investigate the effect of grain boundary on the mechanical properties of polycrystalline silicon. The load-displacement curves and nanohardness curves are obtained. The coordination analysis method is introduced to visualise the motion of the silicon atoms. The diagram about stress distribution is applied to analyse the mechanical behaviour of polysilicon under stress. The results show that when the moving direction of the indenter is almost the same as the grain boundary, grain boundaries become sliding source, which causes the suddenly unloading phenomenon. As a result, the nanohardness is continuously decreasing in the process of sliding. When the moving direction of the indenter is perpendicular to the grain boundary, the dislocations of the polysilicon are limited at grain boundaries, pile-up phenomenon occurs, which means the hardening mechanism is directly related to the nanoscale grain boundaries.
{"title":"Study on the effect of grain boundary on the mechanical properties of polysilicon by molecular dynamics simulation","authors":"Xiaoguang Guo, Changheng Zhai, R. Kang, D. Guo","doi":"10.1504/IJNM.2017.10004718","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004718","url":null,"abstract":"Three-dimensional molecular dynamics simulations are conducted to investigate the effect of grain boundary on the mechanical properties of polycrystalline silicon. The load-displacement curves and nanohardness curves are obtained. The coordination analysis method is introduced to visualise the motion of the silicon atoms. The diagram about stress distribution is applied to analyse the mechanical behaviour of polysilicon under stress. The results show that when the moving direction of the indenter is almost the same as the grain boundary, grain boundaries become sliding source, which causes the suddenly unloading phenomenon. As a result, the nanohardness is continuously decreasing in the process of sliding. When the moving direction of the indenter is perpendicular to the grain boundary, the dislocations of the polysilicon are limited at grain boundaries, pile-up phenomenon occurs, which means the hardening mechanism is directly related to the nanoscale grain boundaries.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"129"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48249848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004716
Feng Kaiping, Zhou Zhao-zhong, H. Fan, J. Yuan
In order to improve the efficiency of ultra-precision processing, the self-sharpening fine super-hard abrasive tool is presented. Diamond abrasive tool samples adding three different soluble fillers Zn, CaO and SiO2 were prepared separately and soaked in dressing dissolvent to verify dissolving capacity of the soluble fillers in the dressing dissolvent. Grinding experiments of using three novel abrasive tools were carried out compared with conventional super-hard diamond abrasive tool. The experiment result showed that the combination of abrasive adding filler Zn and FeCl3 solution showed good performance, the surface roughness of the K9 glass reduced from Ra = 1.9307 µm to Ra = 0.1011 µm after 4 h grinding. During grinding, soluble fillers exposed on the abrasive surface were dissolved by dressing dissolvent, worn abrasive grains shed, new abrasive grains were exposed to achieve abrasive dressing.
{"title":"Experiment on self-sharpening fine super-hard abrasive tool","authors":"Feng Kaiping, Zhou Zhao-zhong, H. Fan, J. Yuan","doi":"10.1504/IJNM.2017.10004716","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004716","url":null,"abstract":"In order to improve the efficiency of ultra-precision processing, the self-sharpening fine super-hard abrasive tool is presented. Diamond abrasive tool samples adding three different soluble fillers Zn, CaO and SiO2 were prepared separately and soaked in dressing dissolvent to verify dissolving capacity of the soluble fillers in the dressing dissolvent. Grinding experiments of using three novel abrasive tools were carried out compared with conventional super-hard diamond abrasive tool. The experiment result showed that the combination of abrasive adding filler Zn and FeCl3 solution showed good performance, the surface roughness of the K9 glass reduced from Ra = 1.9307 µm to Ra = 0.1011 µm after 4 h grinding. During grinding, soluble fillers exposed on the abrasive surface were dissolved by dressing dissolvent, worn abrasive grains shed, new abrasive grains were exposed to achieve abrasive dressing.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"97"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46868251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004720
Yongbo Wu, Sisi Li, M. Nomura, Satoshi Kobayahi, T. Tachibana
Aiming at the development of a novel grinding technology for the high efficient machining of difficult to machine materials such as titanium alloy Ti-6Al-4V, an ultrasonic assisted electrolytic grinding (UAEG) method was proposed. Firstly, an experimental apparatus was constructed by installing an electrolytic mechanism on an existing 3D CNC machine tool attached with an ultrasonic spindle. Then, after the performance test has been carried out for the constructed apparatus, UAEG experiments of Ti-6Al-4V specimen were conducted on the apparatus to investigate the effects of the ultrasonic vibration of grinding wheel and the electrolytic phenomenon on the grinding force and the work surface quality. The experimental results indicate that the ultrasonic assisted electrolytic grinding is greatly beneficial to the decrease in grinding force and the improvement in the work surface quality compared to conventional grinding.
{"title":"Ultrasonic assisted electrolytic grinding of titanium alloy Ti-6Al-4V","authors":"Yongbo Wu, Sisi Li, M. Nomura, Satoshi Kobayahi, T. Tachibana","doi":"10.1504/IJNM.2017.10004720","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004720","url":null,"abstract":"Aiming at the development of a novel grinding technology for the high efficient machining of difficult to machine materials such as titanium alloy Ti-6Al-4V, an ultrasonic assisted electrolytic grinding (UAEG) method was proposed. Firstly, an experimental apparatus was constructed by installing an electrolytic mechanism on an existing 3D CNC machine tool attached with an ultrasonic spindle. Then, after the performance test has been carried out for the constructed apparatus, UAEG experiments of Ti-6Al-4V specimen were conducted on the apparatus to investigate the effects of the ultrasonic vibration of grinding wheel and the electrolytic phenomenon on the grinding force and the work surface quality. The experimental results indicate that the ultrasonic assisted electrolytic grinding is greatly beneficial to the decrease in grinding force and the improvement in the work surface quality compared to conventional grinding.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"152"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42159641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-27DOI: 10.1504/IJNM.2017.10004722
Yuya Kobaru, E. Kondo, R. Iwamoto
A lot of studies on the ultra-precision cutting of single crystal silicon have been reported and they used the diamond cutting tools. However, the diamond cutting tools are very expensive. Therefore, if the single crystal diamond tools were replaced with sintered CBN tools, the cost of machining could be fairly reduced. However, it is easily expected that the CBN tools wear out faster than the diamond tools. Therefore, it is very important to find out the optimum cutting conditions in order to reduce tool wear. In this study, precision cutting of single crystal silicon was machined with using CBN cutting tools having chamfer at cutting edge and large nose radius, and the effect of feed rate, cutting speed, depth of cut and nose radius on the tool wear were studied. As a result, the local minimum of width of flank wear land appeared at the feed rate of 30~50 µm/rev.
{"title":"Precision cutting of single crystal silicon using CBN tool with large top corner radius","authors":"Yuya Kobaru, E. Kondo, R. Iwamoto","doi":"10.1504/IJNM.2017.10004722","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10004722","url":null,"abstract":"A lot of studies on the ultra-precision cutting of single crystal silicon have been reported and they used the diamond cutting tools. However, the diamond cutting tools are very expensive. Therefore, if the single crystal diamond tools were replaced with sintered CBN tools, the cost of machining could be fairly reduced. However, it is easily expected that the CBN tools wear out faster than the diamond tools. Therefore, it is very important to find out the optimum cutting conditions in order to reduce tool wear. In this study, precision cutting of single crystal silicon was machined with using CBN cutting tools having chamfer at cutting edge and large nose radius, and the effect of feed rate, cutting speed, depth of cut and nose radius on the tool wear were studied. As a result, the local minimum of width of flank wear land appeared at the feed rate of 30~50 µm/rev.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"170"},"PeriodicalIF":0.0,"publicationDate":"2017-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48311640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-02DOI: 10.1504/IJNM.2017.10003132
Jinxuan Bai, Q. Bai, Xin He, Qingchun Zhang
The two-dimensional discrete dislocation dynamics simulations under fully periodic boundary conditions has been employed to study the dislocation pattern evolution in the early stages of fatigue in aluminium single crystal. Long-range force among of dislocations is solved by line elasticity model, and short-range force is obtained by constitutive equations of dislocation nucleation, slip, pileup and annihilate. Dislocation movement mechanisms of single-slip-oriented and multi-slip systems are simulated and the evolution process of fatigue pattern is revealed. The result shows that dislocation quantity and microstructure strongly depend on external load and internal configuration. The dislocation pattern of single-slip-oriented generate matrix wall, and positive dislocations are vertical alignment and negative dislocations are at the angle of 45° with slip oriented in the initial stage. For multi-slip system, maze structure of dislocations is produced during dislocation multiplication, which eventually transforms into persistent slip band. The result is consistent with the existing experiment.
{"title":"Dislocation dynamic simulation of dislocation pattern evolution in the early fatigue stages of aluminium single crystal","authors":"Jinxuan Bai, Q. Bai, Xin He, Qingchun Zhang","doi":"10.1504/IJNM.2017.10003132","DOIUrl":"https://doi.org/10.1504/IJNM.2017.10003132","url":null,"abstract":"The two-dimensional discrete dislocation dynamics simulations under fully periodic boundary conditions has been employed to study the dislocation pattern evolution in the early stages of fatigue in aluminium single crystal. Long-range force among of dislocations is solved by line elasticity model, and short-range force is obtained by constitutive equations of dislocation nucleation, slip, pileup and annihilate. Dislocation movement mechanisms of single-slip-oriented and multi-slip systems are simulated and the evolution process of fatigue pattern is revealed. The result shows that dislocation quantity and microstructure strongly depend on external load and internal configuration. The dislocation pattern of single-slip-oriented generate matrix wall, and positive dislocations are vertical alignment and negative dislocations are at the angle of 45° with slip oriented in the initial stage. For multi-slip system, maze structure of dislocations is produced during dislocation multiplication, which eventually transforms into persistent slip band. The result is consistent with the existing experiment.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"13 1","pages":"12"},"PeriodicalIF":0.0,"publicationDate":"2017-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42292737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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