李淼泉
个性化签名
- 姓名:李淼泉
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, “973”、“863”首席科学家, 优秀教师/优秀教育工作者
- 职称:-
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学科领域:
材料科学基础学科
- 研究兴趣:
李淼泉于1987年4月毕业于西北工业大学。1994年2月破格晋升为西北工业大学副教授,1997年12月破格晋升为西北工业大学教授,1998年12月被遴选为西北工业大学材料加工工程学科博士生导师。2002年以访问教授身份应邀赴英国伯明翰大学(The University of Birmingham)进行合作研究。本人兼任中国材料研究学会青年委员会理事;中国航空学会材料工程分会理事及热工艺与表面工程学术委员会副主任;中国机械工程学会塑性工程分会精锻学术委员会委员和超塑性学术委员会委员;陕西省材料研究学会理事;《塑性工程学报》、《锻压技术》和《材料工程》编委;陕西省摩擦焊接工程技术重点实验室学术委员会副主任;西北工业大学高性能计算研究与发展中心学术委员会委员。1995年获“光华科技基金奖”;1996年获首届“陕西青年科技奖”;1998年获第六届“中国青年科技奖”; 1998年获国务院颁发的“政府特殊津贴”;1999年获中国航空学会青年科技奖;2000年获高校首届“优秀青年教师奖”。 始终围绕不同尺度下的精确控制成形理论与金属新材料开展研究工作,先后主持及参加了国家自然科学基金(7项)、国家“973”项目子课题(1项)、航空基础科学基金(6项)和教育部奖励基金(1项),国际合作项目(1项),国防预先研究项目(2项)等共30余项。 通过实验研究与数学-力学方法相结合,创造性地提出了多种宏观成形缺陷并存的判断准则;在宏观成形缺陷研究的基础上,将介观空洞损伤与宏观韧性破坏行为相联系,成功地开展了材料不同尺度下塑性成形机理的研究;进一步将材料的微观组织演变与塑性流动行为相联系,探索跨材料尺度(宏观-介观-微观)的塑性成形机理研究;应用塑性成形技术成功地制备出纳米钛合金和超细晶铝合金。已在国际学术刊物和国际学术会议上发表论文52篇,《SCI》论文35篇,《EI》论文56篇;申报国家发明专利6项;获国家科技进步叁等奖1项、国家教委等部省级科技进步贰等奖5项、叁等奖3项。
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主页访问
2449
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0
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成果阅读
457
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成果数
10
李淼泉, Miaoquan Li, Shichun Wu
Journal of Materials Processing Technology 61(1996)298-301,-0001,():
-1年11月30日
Cavities have been widely observed during the superplastic deformation of metals and alloys, the superplasticity of metals and alloys generally being sensitive to cavity formation. However, the shape of the cavities is irregular during superplastic deformation, thus quantitative analysis of the shape of the cavities is one of the keys to the studying of the superplastic deformation mechanism. In this paper, the quantitative effects of process parameters on the fractal dimension, Df, of the shape of cavities during the superplastic deformation of duralumin LYI2CZ (approximately corresponding to ASTM 2024) with and without the application of an external electric field is studied. The experimental results show that: (i) the fractal dimension of the shape of cavities varies with the change of process parameters (deformation temperature, T, true strain, ε, initial strain rate, ε0), both with and without the application of an external electric field; (ii) the fractal dimension of the shape of cavities also varies with the intensity of the electric field, E, under otherwise identical conditions. The results in this paper show that the improvement of superplasticity with the application of an external electric field is related to a lower value of the fractal dimension in the quasi-stable flow stage of superplastic deformation.
Duralumin, Superplastic deformation: Fractal dimension
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【期刊论文】Electric field modification during superplastic deformation of 15 vol% SiCp/LY12 Al composite
李淼泉, Li Miaoquan*, Chen Yanyun, Chen Dengjun
Journal of Materials Processing Technology 73(1998)264-267,-0001,():
-1年11月30日
investigated. The electroplastic effect of 15 vol% SiCp/LY12 Al composite and the influence of deformation process parameters on the superplasticity have also been studied. The experimental results show that: (i) the optimum intensity of the electric field improves the superplasticity of 15 vol% SiCp/LY12 AI composite, i.e. the strain-rate sensitivity index (m) is increased by 13% and the elongation (δ) is 420%, being increased by 20%; (ii) the optimum intensity of the electric field decreases the flow stress by 16% during the superplastic deformation of 15 vol% SiCp/LY12 Al composite; (iii) the optimum intensity of the electric field makes the grain size finer during the superplastic deformation of 15 vol% SiCp/LYI2 Al composite, which provides the microstructural conditions for the improvement of superplasticity, but the electric field has only a slight influence on the microstructure before superplastic deformation.
Electric field modification, Superplastic deformation, Al composite
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李淼泉, Li Miaoquana, *, Chen Dunjuna, Xiong Aiminga, Long Lib
Journal of Materials Processing Technology 123(2002)377-381,-0001,():
-1年11月30日
In this paper, an adaptive model of grain size, has been established with the help of the fuzzy neural networks (FNNs), based on experimental results for Ti-6Al-4V titanium alloy with homogeneous deformation under various process technological parameters. The data of Teacher's samples has been obtained from the experimental results. By the comparison of the calculated results with the experimental data of the Teacher's samples and the testing samples, it has been verified that the model proposed in this paper can be applied to compute the grain size evolution during the deformation of Ti-6Al-4V titanium alloy.
Forming, Titanium alloy, Grain size, FNN model
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【期刊论文】Microstructural evolution and mechanical properties of the semisolid Al-4Cu-Mg alloy
李淼泉, Haitao Jiang, Yalin Lu, Weichao Huang, Xiaoli Li, Miaoquan Li*
Materials Characterization 51(2003)1-10,-0001,():
-1年11月30日
Microstructural evolution and the mechanical properties of the semisolid Al-4Cu-Mg alloy were investigated, and a grain coarsening equation of this semisolid alloy in the semisolid state was provided based on Ostwald ripening theory. The experimental results showed that the process parameters, including height reduction, isothermal temperature and holding time, affect grain size, fractal dimension and distribution of grain size to some extent. The grain size decreases with an increase of the height reduction, a decrease of the isothermal temperature and/or the holding time. The spheroidization of grains is promoted with an increase of height reduction, isothermal temperature or holding time. The grain size has a Gaussian distribution under different experimental conditions. There will be a more uniform distribution of grain size at high height reduction, low isothermal temperature and short holding time. The pretreatment of samples with cold or hot deformation before isothermal heat treatment is necessary. Good ultimate strength and yield strength could be obtained by the conditions of suitable height reduction, low isothermal temperature and short holding time. Finally, a kinetic equation of grain coarsening was put forward, which could be applied to the semisolid Al-4Cu-Mg alloy system over a high volume fraction of separated grains range from 0.75 to 0.90.
Aluminum alloy, Semisolid state, Microstructural evolution, Mechanical properties
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李淼泉, Dunjun Chen*, Miaoquan Li, Shichun Wu
Journal of Materials Processing Technology 142(2003)197-202,-0001,():
-1年11月30日
In this paper, an adaptive fuzzy-neural network model has been established to model the microstructure evolution and constitutive relation of 15 vol% SiCp/LY12 aluminum composite during superplastic deformation. This network integrates the learning power of neural networks with fuzzy inference systems. During the training process of the network, the back-propagation learning algorithm is applied to optimally adjust the weight coefficients of the neural network and the parameters of the fuzzy membership functions. Then, the trained network is used to predict the microstructure evolution and constitutive relation of 15 vol% SiCp/LY12 aluminum composite during superplastic deformation. The predicted results agree very well with the experimental data of the test samples. On the basis of the good prediction ability of the proposed fuzzy-neural network, the constitutive relation and microstructure of 15 vol% SiCp/LY12 aluminum composite under various superplastic deformation conditions have also been calculated and analyzed.
Fuzzy-neural network, Superplastic deformation, Microstructure evolution, Constitutive relation
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【期刊论文】New model of microstructural evolution during isothermal forging of Ti-6Al-4V alloy
李淼泉, M.-Q. Li and A.-M. Xiong
,-0001,():
-1年11月30日
An artificial neural network model of microstructural evolution, in particular grain size and volume fraction of α phase, has been established and trained with the help of experimental results obtained using Ti-6Al-4V alloy subjected to homogeneous deformation under high temperature. The measurement of microstructural variables was carried out using a Leica microscope. By comparison of the calculated results with the experimental data from training specimens and testing specimens, it has been verified that the proposed model can be applied to compute the microstructural evolution of formed Ti-6Al-4V alloy.
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【期刊论文】Simulation and experiment of curve irradiated laser bending process of titanium alloy sheet
李淼泉, D.-J. Chen, Y.-B. Xiang, S.-C. Wu, and M.-Q. Li
,-0001,():
-1年11月30日
Laser bending along a curve scanning path is a complex 3D forming process. To analyse the deformation behaviour of the process and the effect of process parameters on the bending angle of sheets, numerical simulation becomes indispensable. In this paper, non-linear transient heat transfer and dynamic structural computational models including thermal mechanical coupling analysis, in which the temperature dependence of the thermal and mechanical properties of the material are taken into account, have been developed. The temperature, stress, and strain fields as well as the effect of process parameters on the bending angle were calculated on the basis of models using the finite element method. Meanwhile, an experimental parameter investigation was also carried out. The results showed that, compared with the linear laser bending, curve irradiated laser bending has a significant reduction of the bending angle and the bending angle decreases with increasing path curvature. The bending angle increases with increasing laser power and decreasing spot diameter, and decreases roughly with decreasing scanning velocity. Good correlation was found between the numerically simulated results and the experimental data.
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【期刊论文】Application of fuzzy neural network to laser bending process of sheet metal
李淼泉, D.-J. Chen, Y.-B. Xiang, S.-C. Wu, and M.-Q. Li
,-0001,():
-1年11月30日
The optimisation and selection of process plans is very important for laser bending of sheet metal to achieve the anticipated bending deformation. In this paper, an adaptive fuzzy neural network has been proposed to predict the bending deformation. This network integrates the learning power of neural networks with fuzzy inference systems. During the establishing process of the energy density (composed of three process parameters: laser power, scanning velocity, and spot diameter), width, thickness of sheet, and scanning path curvature were taken as four input variables of the network. The gradient descent learning algorithm was applied to optimally adjust the weight coefficients of the neural network and the parameters of the fuzzy membership functions. Then, the trained network was used to predict the laser bending deformation. Good correlation was found between the predictive and experimental results.
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李淼泉, A.-M. Xiong, M.-Q. Li, W.-C. Huang, S.-H. Chen and H. Lin
,-0001,():
-1年11月30日
Elevated temperature true stress-strain curves have been determined for the isothermal deformation of a TC6 titanium alloy using hot compression testing in the deformation temperature range 800-1040℃, strain rate range 0·001-50s-1 and reduction in height of 30-50%. The experimental results show that the flow stress of TC6 titanium alloy is strongly dependent on process parameters, especially on the deformation temperature and strain rate. The peak stress and steady stress of such an alloy have the same characterisation, which increases with higher strain rate and lower deformation temperature. During isothermal forging, microstructural characterisation, including volume fraction, grain size, and grain pattern of prior α phase, varies with different temperatures, height reductions, and strain rates.
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李淼泉, M. Q. Li, A. M. Xiong, H. R. Wang, S. B. Su and L. C. Shen
,-0001,():
-1年11月30日
Isothermal compression tests on a commercial TC6 titanium alloy have been conducted at deformation temperatures of about 800-1040℃, strain rates of 0·001-50s-1 and height reductions of 30-50%. The microstructural evolution is represented through the measured grain size of the prior α-phase. Meanwhile, a new constitutive equation, which includes the grain size, is established for high temperature deformation behaviour. The procedure required to formulate a constitutive equation from the experimental results is presented. The constitutive equation to model the behaviour of the TC6 titanium alloy during high temperature deformation is validated and its formulation is presented. The results show that the present equation is satisfactory for describing the behaviour of the TC6 titanium alloy during high temperature deformation. The maximum difference between the calculated and the experimental results is less than 15%.
Titanium alloys,, High temperature deformation,, Grain size,, Constitutive equation
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