毛卫民
金属材料各向异性的生成原理及其工业应用,其中包括在材料的合成、制备、凝固、变形、组织转变等各个环节中金属多晶体晶体学织构的形成和转化规律,以及相关的织构理论
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- 姓名:毛卫民
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博士生导师,
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学科领域:
材料合成与加工工艺
- 研究兴趣:金属材料各向异性的生成原理及其工业应用,其中包括在材料的合成、制备、凝固、变形、组织转变等各个环节中金属多晶体晶体学织构的形成和转化规律,以及相关的织构理论
毛卫民,教授,博士生导师。1977年于东北工学院金属材料系本科毕业。1981年毕业于北京钢铁学院材料科学与工程系,并获硕士学位。1983-1988年在德国Aachen工业大学金属学研究所学习并从事金属材料学研究,并于1988年获博士学位,现任北京科技大学材料学系教师。主讲“材料的结构”、“材料科学与工程原理”等课程。长期从事金属材料的晶体学织构与各向异性原理的研究。主要的研究方向为金属材料各向异性的生成原理及其工业应用,其中包括在材料的合成、制备、凝固、变形、组织转变等各个环节中金属多晶体晶体学织构的形成和转化规律,以及相关的织构理论;研究和开发诸如超深冲钢板、新一代优质硅钢板、半导体薄膜、电容器铝箔、超导材料薄膜、新型稀土永磁材料和磁致伸缩材料等各种能够利用材料晶体学织构与各向异性的高性能先进金属材料。主持完成国家科技攻关项目、国家经贸委项目、国家自然科学基金面上项目、北京市科委、北京市自然科学基金委、科技部863等多项科研项目。在国内外发表论文100余篇,出版4部著作,获5项国家发明专利、获省部级科技进步一等奖2项。目前在材料织构研究、薄膜应力研究、材料组织结构参数和各向异性在线检测技术的研究、电子工业用铝材组织结构控制技术的研究等方面承担着国家自然科学基金项目、国家高技术研究发展计划863项目、教育部重点研究计划等多项研究课题和多项企业课题。
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毛卫民
中国科学(E辑)2006(30):481~483,-0001,():
-1年11月30日
以β'-CuZn 相为例分析了轧制应力作用下B2结构金属发生机械孪生的基本过程,并从力学和晶体结构的稳定性两个方面论证了B2结构金属的逆向机械孪生行为。结果表明,逆向孪生能保持B2结构不变,且在多晶轧制变形条件下的应变阻力最小。
塑性变形,, 机械孪生,, B2结构,, β', -CuZn合金
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毛卫民, 陈冷, 余永宁
科学通报,2002,20(47):1540~1543,-0001,():
-1年11月30日
出了一种考虑反应应力的体心立方金属塑性变形模型,计算了位错开动所造成的切应变及可能会引发的反应应力,并使之影响到后续的位错开动过程。在{110}和{112}两类滑移面上的临界切应力比为0.95,第2位错与第1位错取向因子差小于5%,第2位错也同时开动的条件下计算了体心立方金属冷轧80%时的变形织构。结果表明,所计算的织构比以往其他计算模型更接近冷轧80%无间隙原子钢板的实际织构。分析认为,该模型可以兼顾多晶体塑性变形时应变与应力的连续性,因而更接近于体心立方金属变形的真实晶体学过程。
体心立方金属,, 塑性变形,, 织构,, 应力,, 应变,, 模拟
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【期刊论文】CALCULATION OF MISORIENTATION DISTRIBUTION BETWEEN RECRYSTALLIZED GRAINS AND DEFORMED MATRIX
毛卫民, G. Zhu, , W. Mao and Y. Yu
Scripta mater. 42(2000)37-41,-0001,():
-1年11月30日
Misorientation between neighboring grains has significant influence on migration of grain boundaries during annealing of cold worked polycrystalline materials (1,2). The migration of grain boundaries could lead to formation of unique textures and improvement of materials properties (3). Therefore,characterization of the misorientation distributions is crucial for understanding underlying mechanisms.Based on group theory and the assumption of random orientation distribution, MacKenzie (4,5)calculated the distribution of misorientation angles and rotation axes in polycrystalline materials withcubic symmetry. A Similar study was reported by Morawiec (6) for materials with other crystalsymmetries. Recently, the EBSD (Electron Back Scattering Diffraction) technique was successfullyutilized to determine misorientation distributions between grains in either randomly or preferentiallyoriented polycrystalline materials (1-3). However, theoretical characterization of the misorientationdistribution in materials with strong texture remains a challenge. The study of textured materials wouldhave practical impact in industry, especially in the case of grain boundary migration during recrystallizationof heavily deformed matrix. In the present work, a new method is presented for calculating themisorientation distribution in textured polycrystalline materials.
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【期刊论文】INHOMOGENEITY OF ROLLING TEXTURE IN Fe-28A1-2Cr ALLOY
毛卫民, W. Mao and Z. Sun
Vol. 29, pp. 217-220, 1993 Printed in the U.S.A.,-0001,():
-1年11月30日
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毛卫民, W. Mao a, b, ∗, Y. Yu a
Materials Science and Engineering A 367(2004)277-281,-0001,():
-1年11月30日
A deformation model with the consideration on reaction stress between grains in polycrystalline aggregates is proposed, in order to solvethe problems of strain and stress incompatibility appearing in previous Sachs- and Taylor-type models. The corresponding simulation fortensile deformation indicates that the model predicts orientation evolutions similar to that made by Taylor assumption, while the attention toboth of the stress and strain compatibility has been given without cryptic fitting parameters. A 'hard' area, where no track of tensile directioncould run through, was predicted near <1 1 1> according to the simulation, which agrees with some experimental observations.
Tensile deformation, Plastic behavior, Slip system, Elastic reaction stress, Polycrystalline aggregate
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【期刊论文】Analysis of misorientation distribution in polycrystalline aluminum sheet by using ODF data
毛卫民, Weimin Mao *
Materials Science and Engineering A 300(2001)80-84,-0001,():
-1年11月30日
The misorientation distributions in deformed and recrystallized polycrystalline aluminum were calculated and analyzed basedon the orientation distribution function (ODF) data. The calculation result was a very good statistical description of themisorientation distribution between neighboring grains. The calculated distributions consist of a random part and a characterizedpart, of which the characterized part represents the major characteristics of the corresponding misorientation distribution. Therepresentability of calculated misorientation distribution is discussed.
Misorientation distribution, ODF application, Aluminum sheet
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【期刊论文】Modeling of rolling texture in aluminum
毛卫民, Weimin Mao
Materials Science and Engineering A 257(1998)171-177,-0001,():
-1年11月30日
In comparison with the rolling texture modeling based on the Sachs, Taylor and modified Taylor assumptions a modified Sachs model was proposed, in which the equilibrium of both stresses and strains among the deformed grains is considered and therefore the shear strains are partially constrained by activation of other slip systems besides the primary one. The modeling predicts more details of the rolling texture that observed frequently in rolling aluminum sheets, and the model calculation could include the influence of initial texture. The parameters for homogeneous rolling are reported and the shear texture formation is also discussed.
Rolling deformation, Inhomogeneous deformation, Aluminum, Texture modeling
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【期刊论文】Precipitation behavior of an Fe-1.03 wt.% Cu alloy
毛卫民, W. Mao, H. Ren, Y. Yu
Z. Metallkd. 95(2004)1,-0001,():
-1年11月30日
The precipitation behavior of a high purity Fe-1.03 wt. %Cu alloy during ageing at 650 C has been investigated bytransmission electron microscopy. The microstructure andthe corresponding diffraction patterns of the {100}*,{110}* and {111}* reciprocal planes were analyzed. A metastablephase with a B2-like structure was observed, whichis quite different from the equilibrium copper phase shownin the Fe -Cu phase diagram. The formation mechanism ofthe B2-like structure is deduced based on the energeticpoint of view.
Precipitation, B2 structure, Fe -Cu alloy
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毛卫民, Z. Zhao a, W. Mao b, F. Roters c, D. Raabe c, *
Acta Materialia 52(2004)1003-1012,-0001,():
-1年11月30日
The influence of discrete texture components and combinations of them on the earing behavior of aluminium during cup drawingwas systematically investigated using the texture component crystal plasticity finite element method. Several common texturecomponents and their combinations were selected and the resulting ear profiles were calculated under consideration of texturechanges. The spherical scatter width of the components was also taken into account as an optimization parameter. The study revealsthat the ear height and profile can be minimized by an optimized combination of certain texture components including their scatterwidth. A solution for minimum earing of cup drawn aluminium was obtained for a combination of the S and the Cube texturecomponents with 15
Crystallographic texture, Deformation, Modeling, Earing, fcc, Aluminium
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毛卫民, D. Raabe a, ∗, Z. Zhao a, W. Mao b
Acta Materialia 50(2002)4379-4394,-0001,():
-1年11月30日
We present plane strain simulations about the dependence of orientational in-grain subdivision and crystallographic deformation textures in aluminum polycrystals on grain interaction. The predictions are compared to experiments. For the simulations we use a crystal plasticity finite element and different polycrystal homogenization models. One set of finite element simulations is conducted by statistically varying the arrangement of the grains in a polycrystal. Each grain contains 8 integration points and has different neighbor grains in each simulation. The reorientation paths of the 8 integration points in each grain are sampled for the different polycrystal arrangements. For quantifying the influence of the grain neighborhood on subdivision and texture we use a mean orientation concept for the calculation of the orientation spread among the 8 originally identical in-grain orientation points after plastic straining. The results arecompared to Taylor-Bishop-Hill-type and Sachs-type models which consider grain interaction on a statistical basis.The study reveals five important points about grain interaction. First, the consideration of local grain neighborhoodhas a significant influence on the reorientation of a grain (up to 20% in terms of its end orientation and its orientationdensity), but its own initial orientation is more important for its reorientation behavior than its grain neighborhood.Second, the sharpness of the deformation texture is affected by grain interaction leading to an overall weaker texturewhen compared to results obtained without interaction. Third, the in-grain subdivision of formerly homogeneous grainsoccurring during straining is strongly dependent on their initial orientation. For instance some crystals build up ingrainorientation changes of more than 20°after 95% straining while others do practically not subdivide. Fourth, thedependence of in-grain subdivision on the neighbor grains is different for crystals with different initial orientation (cubeor rotated Goss grains reveal strong subdivision). Fifth, the upper bound for the variation of texture due to changes ingrain neighborhood amounts at most to 5% in terms of the positions of the main texture components. In terms of theoverall orientation density all predictions (using different neighborhood configurations) remain within a narrow tubewith an orientation scatter of 10% (β-fiber) to 20% (Brass component, α-fiber) when the neighborhood changes.
Texture, Theory &, modeling-structural behavior, Mechanical properties-plastic, Metals-crystalline, Mesostructure
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