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富氯T颗粒乳剂的新型晶形调变剂
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作者 黄仁清 《影像技术》 CAS 1996年第4期11-16,共6页
本文概述了柯达公司的照相乳剂制备专家Joe E.Maskasky近年提出的用于制备富氯T颗粒乳剂的新型晶形调变剂的优良特性、种类、结构及作用机理;并例举了应用实例。
关键词 照相乳剂 T颗粒乳剂 感光乳剂
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Preparation and Characterization of Nanometer TiO_2 by Hydrolysis Precipitation Method 被引量:1
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作者 方世杰 徐明霞 +1 位作者 郝俊杰 汪成建 《Transactions of Tianjin University》 EI CAS 2002年第2期79-82,共4页
Nanometer TiO 2 powders were obtained from TiOSO 4 and studied by XRD, TEM and BET. The result indicated that pH and heat treatment temperature have great effects on their grain size and crystal phase structu... Nanometer TiO 2 powders were obtained from TiOSO 4 and studied by XRD, TEM and BET. The result indicated that pH and heat treatment temperature have great effects on their grain size and crystal phase structure. Annealed at 500 ℃, nanometer TiO 2 with a specific surface area of 101.39 m 2 ·g -1 and a grain size about 10 nm were obtained(pH=5); and with a specific surface area of 95.48 m 2 ·g -1 and a grain size about 30 nm were obtained(pH=10). The research indicated that crystal phase transformation of rutile at 750 ℃made great promotion in grain size growth. 展开更多
关键词 nanometer Tio 2 hydrolysis precipitation method PH crystal phase transformation
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Influence of strain rate on microstructure and formability of AZ31B magnesium alloy sheets 被引量:10
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作者 王利飞 黄光胜 +1 位作者 李红成 张华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期916-922,共7页
The effects of strain rate on microstructure and formability of AZ31B magnesium alloy sheets were investigated through uniaxial tensile tests and hemispherical punch tests with strain rates of 10^-4, 10^-3, 10^-2, 10^... The effects of strain rate on microstructure and formability of AZ31B magnesium alloy sheets were investigated through uniaxial tensile tests and hemispherical punch tests with strain rates of 10^-4, 10^-3, 10^-2, 10^-1 s^-1 at 200℃. The results show that the volume fraction of dynamic recrystallization grains increases and the original grains are gradually replaced by recrystallization grains with the strain rate decreasing. A larger elongation and a smaller r-value are obtained at a lower strain rate, moreover the erichsen values become larger with the strain rate reducing, so the formability improves. This problem arises in part from the enhanced softening and the coordination of recrystallization grains during deformation. 展开更多
关键词 AZ31B magnesium alloy strain rate dynamic recrystallization FORMABILITY
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Crystal anisotropy of AZ31 magnesium alloy under uniaxial tension and compression 被引量:8
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作者 蓝永庭 钟献词 +2 位作者 权高峰 蔺若成 张克实 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期249-260,共12页
To investigate the deformation twinning and the plastic anisotropy of the hexagonal-close-packed(HCP) single crystal, the crystal plastic constitutive model including slip and twinning deformation was established wi... To investigate the deformation twinning and the plastic anisotropy of the hexagonal-close-packed(HCP) single crystal, the crystal plastic constitutive model including slip and twinning deformation was established with finite element method based on crystal plasticity theory. The model was verified by test data. Newton-Raphson iteration method was developed with the stress components directly as the basic variables of iteration. The plastic deformation behavior of single crystal AZ31 alloy was analyzed numerically under monotonic tension and compression, respectively, in four different strain paths(i.e. along 〈2110〉, 〈 0110〉, 〈0001〉 and 〈0111〉) with this model. The stress-strain curves were obtained in the above paths. The numerical calculation results show that this crystal model is feasible to predict the activity of slip/twinning system and to describe the number of active twin variants, the types of dominant twin variants and twin intersection. Due to the polar nature of mechanical twinning in inelastic deformation of the material, the plastic behavior of the single crystal material is demonstrated to be notably anisotropic and high asymmetry. 展开更多
关键词 AZ31 magnesium alloy constitutive model single crystal deformation twin twin variant twin intersection
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Deformation mechanisms of Mg-3Al-1Zn alloy by polycrystal plasticity modeling 被引量:1
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作者 尹德良 刘金强 吴冰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2188-2194,共7页
A polycrystal plasticity model was developed to analyze the room-temperature deformation behaviors of Mg-3A1-1Zn alloy(AZ31).The uniaxial tension and compression tests at room temperature were conducted using cast a... A polycrystal plasticity model was developed to analyze the room-temperature deformation behaviors of Mg-3A1-1Zn alloy(AZ31).The uniaxial tension and compression tests at room temperature were conducted using cast and extruded AZ31 rods with different textures and combined with the proposed model to reveal the deformation mechanisms.It is shown that,different flow curves of two specimens under tension and compression tests can be simulated by this model.The flow curves of AZ31 extrusions exhibit different shapes for tension and compression due to different activities of tensile twinning and pyramidalc+a slip.The metallographic and TEM observations showed the equal twinning activities at the initial stage in tension and compression tests and the occurrence of pyramidalc+a slip in compression of as-cast Mg-3A1-1Zn alloy with increasing the strain,which is consistent with the simulated results by the proposed model. 展开更多
关键词 Mg alloy deformation mechanism polycrystal plasticity model TEXTURE
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Polycrystalline model for FE-simulation of micro forming processes 被引量:3
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作者 王春举 郭斌 单德彬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1362-1366,共5页
A new polycrystal model was presented from the viewpoint of polycrystal structure of the billets considering free surface effects.In the model,the billet was divided into three portions,such as free surface portion,tr... A new polycrystal model was presented from the viewpoint of polycrystal structure of the billets considering free surface effects.In the model,the billet was divided into three portions,such as free surface portion,transition portion and internal portion.The grains in free surface portion were considered the single grains,and the anisotropy of the grains was taken into account by introducing grain orientation to explain the inhomogeneous deformation.In the transition portion,the effects of the neighbouring grains were adopted in the model.The grains in the internal portion were considered the polycrystalline material.With the developed model,the upsetting deformation process was simulated by the MSC Superform software.The scatter of the flow stress and inhomogeneous deformation was observed by analysis of the model.The comparisons show that the computational results are good agreed with the experimental results.This means that the presented model is effective. 展开更多
关键词 micro forming size effect polycrystal model inhomogeneous deformation
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减振合金(二)
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作者 李湘洲 《金属世界》 1995年第6期14-14,27,共2页
减振吸音的缘由 上一期提到在人们的传统观念中,金属是极易产生振动和发出响亮声音的材料,那么减振合金为什么能减振吸音呢? 大家知道,任何材料在弹性变形范围内的应力——应变过程中,一般应变总是滞后于应力。这是由于任何材料都不可... 减振吸音的缘由 上一期提到在人们的传统观念中,金属是极易产生振动和发出响亮声音的材料,那么减振合金为什么能减振吸音呢? 大家知道,任何材料在弹性变形范围内的应力——应变过程中,一般应变总是滞后于应力。这是由于任何材料都不可能是纯弹性体所决定的。这一滞后现象及其大小表征材料内部对外界能量的衰减特性, 展开更多
关键词 减振合金 复相 铁磁 变晶型 位错
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Preparation and Characterization of Nanometer TiO2 by Hydrolysis Precipitation Method 被引量:1
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作者 方世杰 徐明霞 +1 位作者 郝俊杰 汪成建 《Transactions of Tianjin University》 EI CAS 2002年第2期79-82,共页
Nanometer TiO 2 powders were obtained from TiOSO 4 and studied by XRD, TEM and BET. The result indicated that pH and heat treatment temperature have great effects on their grain size and crystal phase structu... Nanometer TiO 2 powders were obtained from TiOSO 4 and studied by XRD, TEM and BET. The result indicated that pH and heat treatment temperature have great effects on their grain size and crystal phase structure. Annealed at 500 ℃, nanometer TiO 2 with a specific surface area of 101.39 m 2 ·g -1 and a grain size about 10 nm were obtained(pH=5); and with a specific surface area of 95.48 m 2 ·g -1 and a grain size about 30 nm were obtained(pH=10). The research indicated that crystal phase transformation of rutile at 750 ℃made great promotion in grain size growth. 展开更多
关键词 nanometer Tio 2 hydrolysis precipitation method PH crystal phase transformation
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UNDERSTANDING HREM IMAGES OF Al-Mn-Si ICOSAHEDRAL QUASICRYSTAL
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作者 闵乐泉 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1996年第2期142+140-142,共4页
提出了处理数字化图像的光滑算子。用它处理了Al-Mn-Si二十面体准晶的高分辨电子显微图,处理后的图像展示了周期结构特征,由此建立了一个平面周期模型,其Fourier变换图符合Al-Mn-Si准晶相应的电子衍射图。
关键词 图像处理 高分辨电子显微图 周期模 Fourier换图
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Dynamic recrystallization behavior of burn resistant titanium alloy Ti-25V-15Cr-0.2Si
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作者 鲁世强 欧阳德来 +1 位作者 崔霞 王克鲁 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第4期1003-1010,共8页
Dynamic recrystallization (DRX) behavior in β phase region for the burn resistant titanium alloy Ti?25V?15Cr?0.2Si was investigated with a compression test in the temperature range of 950?1100 °C and the strain ... Dynamic recrystallization (DRX) behavior in β phase region for the burn resistant titanium alloy Ti?25V?15Cr?0.2Si was investigated with a compression test in the temperature range of 950?1100 °C and the strain rate of 0.001?1 s?1. The results show that deformation mechanism of this alloy in hot deformation is dominated by DRX, and new grains of DRX are evolved by bulging nucleation mechanism as a predominant mechanism. DRX occurs more easily with the decrease of strain rate and the increase of deformation temperature. Grain refinement is achieved due to DRX during the hot deformation at strain rate range of 0.01?0.1 s?1 and temperature range of 950?1050 °C. DRX grain coarsening is observed for the alloy deformed at the higher temperatures of 1100 °C and the lower strain rates of 0.001 s?1. Finally, in order to determine the recrystallized fraction and DRX grain size under different deformation conditions, the prediction models of recrystallization kinetics and recrystallized grain sizes were established. 展开更多
关键词 burn resistant titanium alloy deformed microstructure deformation mechanism dynamic recrystallization prediction models
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Semi-solid processing of hypereutectic A390 alloys using novel rheoforming process 被引量:10
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作者 M.TEBIB J.B.MORIN +1 位作者 F.A JERSCH X.GRANT CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1743-1748,共6页
The feasibility of semi solid processing of hypereutectic A390 alloys using a novel rheoforming process was investigated. A combination of the swirl enthalpy equilibration device (SEED) process, isothermal holding u... The feasibility of semi solid processing of hypereutectic A390 alloys using a novel rheoforming process was investigated. A combination of the swirl enthalpy equilibration device (SEED) process, isothermal holding using insulation and addition of solid alloy during swirling was introduced as a novel method to improve the processability of semi solid slurry. The effects of isothermal holding and the addition of solid alloy on the temperature gradient between the centre and the wall and on the formation of a(Al) particles were examined. In additional tests, phosphorus and strontium were added to the molten metal to refine the primary and eutectic silicon structure to facilitate semi solid processing. The results show that the combination of the SEED process with two additional processing steps can produce semi-solid A390 alloys that can be rheoprocessed. The microstructure reveals an adequate amount of non-dendritic a(Al) globules surrounded by liquid, which greatly improves the processability of semi-solid slurry. 展开更多
关键词 semi-solid forming rheoforming process hypereutectic A390 alloys MICROSTRUCTURE
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Dislocation density model and microstructure of 7A85 aluminum alloy during thermal deformation 被引量:7
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作者 HU Jian-liang WU Xiu-jiang +3 位作者 BO Hong JIAO Zi-teng HUANG Shi-quan JIN Miao 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期2999-3007,共9页
The microstructure evolution of 7A85 aluminum alloy at the conditions of strain rate(0.001−1 s^(−1))and deformation temperature(250−450°C)was studied by optical microscopy(OM)and electron back scattering diffract... The microstructure evolution of 7A85 aluminum alloy at the conditions of strain rate(0.001−1 s^(−1))and deformation temperature(250−450°C)was studied by optical microscopy(OM)and electron back scattering diffraction(EBSD).Based on the K-M dislocation density model,a two-stage K-M dislocation density model of 7A85 aluminum alloy was established.The results reveal that dynamic recovery(DRV)and dynamic recrystallization(DRX)are the main mechanisms of microstructure evolution during thermal deformation of 7A85 aluminum alloy.350−400°C is the transformation zone from dynamic recovery to dynamic recrystallization.At low temperature(≤350°C),DRV is the main mechanism,while DRX mostly occurs at high temperature(≥400°C).At this point,the sensitivity of microstructure evolution to temperature is relatively high.As the temperature increased,the average misorientation angle(θˉ_(c))increased significantly,ranging from 0.93°to 7.13°.Meanwhile,the f_(LAGBs) decreased with the highest decrease of 24%. 展开更多
关键词 hot deformation microstructure evolution dynamic recrystallization dislocation density model
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Deformation behavior of materials in micro-forming with consideration of intragranular heterogeneities 被引量:2
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作者 Zhen-wu MA Guo-quan TONG Feng CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期616-626,共11页
To describe the relationship between the whole material deformation behavior and each grain deformation behavior inmicro-forming,experimental and numerical modelling methods were employed.Tensile test results reveal t... To describe the relationship between the whole material deformation behavior and each grain deformation behavior inmicro-forming,experimental and numerical modelling methods were employed.Tensile test results reveal that contrary to the valueof flow stress,the scatter of flow stress decreases with the increase of thickness-to-grain diameter(T/d)ratio.Microhardnessevaluation results show that each grain owns unique deformation behavior and randomly distributes in each specimen.The specimenwith less number of grains would be more likely to form an easy deformation zone and produce the concentration of plasticdeformation.Based on the experiment results,a size-dependent model considering the effects of grain size,geometry size,and thedeformation behavior of each grain was developed.And the effectiveness and practicability of the size-dependent model wereverified by experimental results. 展开更多
关键词 MICRO-FORMING deformation behavior size effect model intragranular heterogeneity
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Critical Behavior of Gaussian Model on X Fractal Lattices in External Magnetic Fields
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作者 LIYing KONGXiang-Mu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第3期337-340,共4页
Using the renormalization group method, the critical behavior of Gaussian model is studied in external magnetic fields on X fractal lattices embedded in two-dimensional and -dimensional Euclidean spaces, respectively... Using the renormalization group method, the critical behavior of Gaussian model is studied in external magnetic fields on X fractal lattices embedded in two-dimensional and -dimensional Euclidean spaces, respectively. Critical points and exponents are calculated. It is found that there is long-range order at finite temperature for this model, and that the critical points do not change with the space dimensionality (or the fractal dimensionality ). It is also found that the critical exponents are very different from results of Ising model on the same lattices, and that the exponents on X lattices are different from the exact results on translationally symmetric lattices. 展开更多
关键词 Gaussian model X fractal renormalization group critical phenomena
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New constitutive equation utilizing grain size for modeling of hot deformation behavior of AA1070 aluminum 被引量:9
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作者 H.R.REZAEI ASHTIANI A.A.SHAYANPOOR 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第2期345-357,共13页
A new phenomenological and empirically-based constitutive model was proposed to modify the term in the original Johnson−Cook constitutive model.The new model can be used to describe and predict the flow stress of AA10... A new phenomenological and empirically-based constitutive model was proposed to modify the term in the original Johnson−Cook constitutive model.The new model can be used to describe and predict the flow stress of AA1070 aluminum with different initial grain sizes in the hot working process.This developed model considers thermal softening,strain-rate hardening,strain hardening,initial grain size,and interactions with each other and can correctly model the behavior of AA1070 at elevated temperature with different strains,strain rates,and initial grain sizes.The hot flow behavior of AA1070 was investigated through compression tests over wide ranges of temperature from 623 to 773 K,strain rate from 0.005 to 0.5 s−1 and initial grain size from 50 to 450μm.Results show that the initial grain size has a significant effect on the flow behavior of AA1070.Then,correlation coefficient(R),average absolute relative error(AARE),and relative error were examined for comparative predictability of the model.Results show that flow stresses for different initial grain sizes calculated by the new proposed model perfectly correlate with experimental ones,with a mean relative error of 1.19%,which confirms that the new modified Johnson−Cook relation can give a precise estimation of the hot flow stress of AA1070 aluminum by considering the initial grain size. 展开更多
关键词 constitutive equation modified Johnson−Cook model initial grain size flow stress hot deformation AA1070 aluminum
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Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary 被引量:1
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作者 Ying-jun GAO Zong-ji HUANG +4 位作者 Qian-qian DENG Kun LIAO Yi-xuan LI Xiao-Ai YI Zhi-rong LUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第1期45-63,共19页
An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was proposed.The energy of the pile-up of the G... An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was proposed.The energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was discussed.The results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation decomposition.The mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed. 展开更多
关键词 triple junction of grain boundary dislocation pile-up dislocation structural transformation energy model for pile-up ultrafine-grain materials
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Model of critical strain for dynamic recrystallization in 10%TiC/Cu-Al_2O_3 composite 被引量:4
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作者 杨志强 刘勇 +1 位作者 田保红 张毅 《Journal of Central South University》 SCIE EI CAS 2014年第11期4059-4065,共7页
Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the tempe... Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the temperatures from 450 °C to 850 °C with the strain rates from 0.001 s-1 to 1 s-1. The results show that the softening mechanism of the dynamic recrystallization is a feature of high-temperature flow true stress-strain curves of the composite, and the peak stress increases with the decreasing deformation temperature or the increasing strain rate. The thermal deformation activation energy was calculated as 170.732 k J/mol and the constitutive equation was established. The inflection point in the lnθ-ε curve appears and the minimum value of-(lnθ)/ε-ε curve is presented when the critical state is attained for this composite. The critical strain increases with the increasing strain rate or the decreasing deformation temperature. There is linear relationship between critical strain and peak strain, i.e., εc=0.572εp. The predicting model of critical strain is described by the function of εc=1.062×10-2Z0.0826. 展开更多
关键词 10%Ti C/Cu-Al2O3 composite hot deformation constitutive equation dynamic recrystallization critical condition
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Microstructure homogeneity regulation of 7050 aluminum forgings by surface cumulative plastic deformation 被引量:1
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作者 Jian-liang HU Zi-han ZHAO +4 位作者 Meng-xiao DONG Huan WANG Miao JIN Shi-quan HUANG Hong BO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第9期2814-2827,共14页
To regulate the microstructure homogeneity of large aluminum structural forgings for aircraft,the surface cumulative plastic deformation was proposed.The microstructure of 7050 aluminum forgings after the surface cumu... To regulate the microstructure homogeneity of large aluminum structural forgings for aircraft,the surface cumulative plastic deformation was proposed.The microstructure of 7050 aluminum forgings after the surface cumulative plastic deformation was investigated by electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),and X-ray diffraction(XRD).The results showed that the microstructure evolution of 7050 aluminum forgings was more sensitive to the deformation temperature than the strain rate.The dislocation density continued to increase with the decrease of the deformation temperature and the increase of the strain rate.Dislocation density and stored energy were accumulated by the surface cumulative plastic deformation.Besides,a static recrystallization(SRX)model of 7050 aluminum forgings was established.The SRX volume fraction calculated by this model was in good agreement with the experimental results,which indicated that the model could accurately describe the SRX behavior of 7050 aluminum forgings during the surface cumulative plastic deformation. 展开更多
关键词 microstructure homogeneity regulation surface cumulative plastic deformation dislocation density static recrystallization model
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Deformation study of bicrystalline and nano-polycrystalline structures using phase field crystal method 被引量:1
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作者 LONG Jian ZHANG Shuai +3 位作者 ZHAO YuLong LONG QingHua YANG Tao CHEN Zheng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第6期1046-1056,共11页
Deformation behaviors of bicrystalline and nano-polycrystalline structures of various tilt angles and inclination angles in two dimensions are investigated in detail using a two-mode phase field crystal model.The inte... Deformation behaviors of bicrystalline and nano-polycrystalline structures of various tilt angles and inclination angles in two dimensions are investigated in detail using a two-mode phase field crystal model.The interaction between grain boundary(GB)and dislocation is also examined in bicrystals and nano-polycrystals that both contain asymmetric and symmetric tilt GBs,with energy analysis being carried out to analyze these processes.During deformation simulations,we assume the volume of each simulation cell at every time step is coincident with that of the initial state just before deformation.Our simulation results show that the behaviors of symmetric and asymmetric GBs in bicrystals and nano-polycrystals differ from each other depending on tilt angle and inclination angle.A new dislocation emission mechanism of interest is observed in bicrystals which contain low angle symmetric tilt GBs.Low angle GB has a higher mobility relative to high angle GB in both bicrystalline and nano-polycrystalline structures,as does asymmetric GB to symmetric GB.The generation,motion,pileup and annihilation of dislocations,grain rotation and grain coalescence are observed,which is consistent with the simulation results obtained by molecular dynamics.These simulation results can provide strong guidelines for experimentation. 展开更多
关键词 phase field crystal grain boundary DISLOCATION deformation mechanism
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Invariant line and crystallography of HCP→BCC precipitation
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作者 肖晓玲 罗承萍 刘江文 《Science China(Technological Sciences)》 SCIE EI CAS 2002年第1期58-64,共7页
The method of calculating the invariant line in HCP→BCC precipitation based on the invariant line strain model is described. The experimentally determined crystallographic features of the lath-shaped or needle-like p... The method of calculating the invariant line in HCP→BCC precipitation based on the invariant line strain model is described. The experimentally determined crystallographic features of the lath-shaped or needle-like precipitates formed in the HCP→BCC precipitations occurring in Mg?Al and Zr?Nb alloys were found to be in excellent agreement with the predictions from the model, thus suggesting that the model is valid for predicting the crystallography of diffusion-controlled phase transformations. 展开更多
关键词 HCP→BCC precipitation invariant line invariant line strain model CRYSTALLOGRAPHY
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