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Effect of initial grain size on the recrystallization behavior and recrystallization texture of a Mg-3Gd alloy

材料科学技术（英文版） 2024年第21期188卷 169-182页

作者： Fang Han Xuan Luo knut marthinsen Guilin Wu Ziyong Hou Xiaoxu Huang International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400044China

The effect of initial grain size on the recrystallization and recrystallization texture of a rolled Mg-3Gd(wt.％)alloy is studied in *** results show that the deformation microstructure of an initially coarse-grained(CG)sample has a larger twinned area and a higher density of twin boundaries than a fine-grained(FG)*** annealing,the CG sample recrystallizes preferentially in the twinned area,whereas the FG sample adopts the higher density grain boundaries as the nucleation ***-thermore,weak recrystallization texture components appear from the grain nucleation stage,regardless of the initial grain size,and are preserved after complete recrystallization due to uniform grain *** majority of recrystallization texture is deviated 20°-45° away from normal direction(ND),accounting for more than 50％.Especially,the recrystallization texture of the FG sample is a"Rare Earth texture",in contrast to the widely reported texture modification unrelated to grain boundary *** a scattered basal texture is observed in the CG sample,which also differs from the reported"Rare Earth texture"originating from shear band nucleation in dilute Mg-Gd ***,based on the Johnson-Mehl-Avrami-Kolmogorov(JMAK)model,the recrystallization kinetics are calculated,and it is found that the initial grain size mainly affects the nucleation rate,and has limited effect on the grain growth rate.

关键词： Mg-3Gd Grain size Microstructure evolution Recrystallization texture Recrystallization kinetics

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Isothermal annealing of cold-rolled Al-Mn-Fe-Si alloy with different microchemistry states

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Transactions of Nonferrous Metals Society of China 2014年第12期24卷 3840-3847页

作者：黄科李彦军 knut marthinsen Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) SINTEF Materials and Chemistry

Microstructural evolution of a cold-rolled Al-Mn-Fe-Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods providing a considerable Zener drag influencing the softening behavior while the other gave a lower density of coarser dispersoid structure providing a much smaller drag effect. The gradual microstructural evolutions during annealing for the three variants were captured by interrupting annealing at different time. Effects of microchemistry state on recrystallization kinetics, recrystallized grain structure and texture were characterized by EBSD. It is demonstrated that the actual softening kinetics, final microstructure and texture are a result of delicate balance between processing condition and microchemistry state. Strong concurrent precipitation takes place in the case with high concentration of Mn in solid solution, which suppresses nucleation and retards recrystallization and finally leads to grain structure of coarse elongated grains dominated by a P texture component together with a ND-rotated cube component. On the contrary, when solute content of Mn is low and pre-existing dispersoids are relatively coarser, faster recrystallization kinetics is exhibited together with an equiaxed grain structure with mainly cube texture.

关键词： aluminum alloy Al-Mn-Fe-Si alloy recrystallization kinetics microchemistry precipitation recrystallization texture

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Correlating oriented grain number density of recrystallisation in particle-containing aluminium alloys

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 220-225页

作者：赵庆龙张辉迪 Ke HUANG knut marthinsen 吉林大学材料科学与工程学院汽车材料教育部重点实验室长春130025 Laboratory of Thermomechanical Metallurgy-PX Group Chair Ecole Polytechnique Fédérale de Lausanne Department of Materials Science and Engineering Norwegian University of Science and Technology

The recrystallized grain structure of Al-（Mn）-Fe-Si alloys after isothermal annealing was studied by electron backscatter diffraction（EBSD） technique. Statistical correlation suggests that the frequency of forming P-oriented（{011}？566？） grains at a particle larger than the critical diameter（about 1.1 μm） is about 2% when the effect of fine dispersoids and concurrent precipitation is negligible. The overall grain number density is correlated linearly with the number densities of P and Cube（{001}？100？） grains. The grain number densities of typical orientations（P, ND-rotated cube {001}？310？ and Cube） and the overall recrystallized grains increase as rolling strain increases, following a similar exponential law.

关键词： recrystallisation texture aluminium alloys particle-stimulated nucleation EBSD

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Effect of quenching rate on microstructure and mechanical properties of commercial AA7108 aluminium alloy

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1872-1877页

作者： Ida WESTERMANN Ann Leni HAUGSTAD Yngve LANGSRUD knut marthinsen SINTEF Materials and Chemistry NO-7465TrondheimNorway Department of Materials Science and Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway Benteler Aluminium Systems Norway AS NO-2830RaufossNorway

A commercial AA7108 aluminium alloy subjected to different quenching procedures from the solid solution temperature of 480 ℃ was considered. Both continuously cooling and quenching to intermediate temperatures （400, 300 and 200 ℃） followed by different holding times were applied. All the materials were subsequently subjected to the same industrial two-step artificial ageing procedure to obtain a maximum strength （T6）. Tensile testing of the different quenched materials in the T6 temper reveals a large deviation in strength dependent on the cooling/holding time, compared with the reference sample. A collection of the different quenched materials was chosen for further investigation of the precipitate structure by transmission electron microscopy （TEM） to explain the differences in mechanical properties.

关键词： aluminium microstructure precipitate free zone mechanical properties

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Evolution in microstructure and mechanical properties during back-annealing of AlMnFeSi alloy

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1878-1883页

作者：王宁 Jarl Erik FLATφY 李彦军 knut marthinsen Department of Materials Science and Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway SINTEF Materials and Chemistry NO-7465TrondheimNorway

An Al-Mn-Fe-Si model alloy was subjected to two homogenization treatments, to achieve materials with different levels of Mn in solid solution and dispersoid densities, followed by cold rolling and back-annealing. Characterization of homogenization and deformation structures with respect to the effect of different microchemistries and strains on the structures was performed. Time-temperature-transformation （TTT） diagram with respect to precipitation and recrystallisation as a basis for analysis of the degree of concurrent precipitation was established. The TTT-diagram shows a strong effect of Mn concentration in solid solution and dispersoid density on the softening behavior. Recrystallization which finishes without the effect of concurrent precipitation results in an even, fine and equiaxed grain structure. Precipitation prior to or during recrystallization （concurrent） does retard the softening kinetics and leads to a coarse grain structure. However, the effect also depends on the duration of recrystallization and amount of precipitation. Recrystallization proceeding over a long time combined with a large amount of concurrent precipitation has a strong effect, otherwise the effect will be limited. Pre-existing fine and dense dispersoids （mean size 0.1 μm） before back-annealing do also lead to a coarse grain structure after recrystallization no matter whether additional concurrent precipitation occurs.

关键词： homogenization treatment dispersoid phase solid solution back-annealing recrystallization concurrent precipitation TTT-diagram

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Combined effect of deformation and artificial aging on mechanical properties of Al-Mg-Si Alloy

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1824-1830页

作者： Michal KOLAR Ketill Olav PEDERSEN Sverre GULBRANDSEN-DAHL knut marthinsen Department of Materials Science and Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway SINTEF Materials and Chemistry NO-7465TrondheimNorway SINTEF Raufoss Manufacturing AS NO-2831 RaufossNorway

The effect of pre-deformation followed by or together with artificial aging on the mechanical properties as strength and ductility of an AA6060 aluminium alloy was studied. AA6060 was initially cast, homogenized and extruded according to standard industrial practice. The extruded material was then subjected to a solution heat treatment and subsequently artificial aging after （sequential mode） and during （simultaneous mode） various combinations of deformation （0-10%） and heat treatments. The aging behaviour and mechanical properties were characterized in terms of Vickers hardness and tensile testing. It is found that precipitation kinetics and associated mechanical response, in terms of hardness and tensile properties are strongly affected by pre-deformations. In terms of aging behaviour, kinetics is accelerated and the peak strength generally increases. Comparing sequential mode and simultaneous mode, the latter seems to give overall better mechanical properties and after considerably shorter aging times. The results of the two modes of pre-deformation are compared and discussed in view of differences in processing conditions and microstructure characteristics.

关键词： Al-Mg-Si alloys artificial aging pre-deformation tensile properties

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A Solute Pinning Approach to Solute Drag in Multi-Component Solid Solution Alloys

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Modeling and Numerical Simulation of Material Science 2014年第1期4卷 8-13页

作者： Emmanuel Hersent knut marthinsen Erik Nes Granges Technology FinspangSweden Department of Materials Science and Technology Norwegian University of Science and Technology(NTNU)TrondheimNorway

The Cahn, Lücke and Stüwe theory remains the backbone of more complex analysis dealing with solute drag, however, the mathematical treatment is rather involved. A new approach based on solute pinning the boundary has therefore recently been suggested, which has the main advantage of a simpler mathematical treatment. In the present paper this approach has been generalized to take into account the influence of different types of solute atoms in the high solute content/low driving force regime.

关键词： Boundary Mobility Solute Drag Multi-Component Alloys Analytical Modelling

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Twinnability of Al-Mg alloys:A first-principles interpretation

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1313-1318页

作者： Dong-dong ZHAO Yan-jun LI Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) SINTEF Materials and Chemistry

Al-Mg alloys are considered to have potentials to form twins during deformation because Mg can reduce the intrinsicstacking fault energy?ISFE of ***,twinning has rarely been found in Al-Mg alloys even subjected to various severeplastic deformation(SPD)*** order to probe the twinning propensity of Al-Mg alloys,first-principles calculations werecarried out to investigate the effects of Mg and vacancies on the generalized planar fault energy(GPFE)of *** is found that bothMg and vacancies exhibit a Suzuki segregation feature to the stacking fault,and have the influence of decreasing the?ISFE of ***,?ISFE does not decrease and the twinnability parameterτa of Al does not increase monotonically with increasing Mgconcentration in the *** the basis ofτa evaluated from the calculated GPFE of Al-Mg alloys,we conclude that deformationtwinning is difficult for Al-Mg alloys even with a high content of ***,the decrease of?ISFE caused by the introduction ofMg and vacancies is supposed to have the effect of improving the work-hardening rate and facilitating the formation of bandstructures in Al-Mg alloys subjected to SPD.

关键词： generalized planar fault energy intrinsic stacking fault energy Suzuki segregation Mg vacancy Al-Mg alloys

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Between Early Literary Modernism and Contemporary Post-Postmodernism——Jan Kjrstad Rewrites knut Hamsun’s Novel Hunger 100 Years Later

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外国文学研究 2005年第3期27卷 54-60页

作者： knut Brynhildsvoll professoranddirectoroftheCentreforIbsenStudies UniversityofOslo.

The article is a comparative study of knut Hamsun’s novel Hunger (1890) and Jan Kjrstad’s novel The Brink (1990), focusing on similar motives, topics and references from the point of view of early modernism and post-postmodernism. It sheds light on aesthetic problems concerning how to deal with existential and metaphysical questions viewed against the background of changing historical and philosophical experiences and new ways of poetic expression. The article points out the resemblances and differences between the novels and shows how two of the front figures of modern Scandinavian literature meet the challenges of renewing the traditional forms of writing.

关键词： Between and

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The Claim of the Ideal: Ethics in Ibsen′s Dramas

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外国文学研究 2005年第1期27卷 12-17页

作者： knut Brynhildsvoll the Centre for Ibsen Studies University Oslo

这是一组专题论文 ,由六篇论文组成 ,分别从不同的视角讨论了文学伦理学批评。聂珍钊教授从总体上对文学伦理学批评的起源、方法、内涵、思想基础、适用范围、实用价值和现实意义进行了论述。克努特教授以易卜生的戏剧为例 ,不仅讨论了... 详细信息

这是一组专题论文 ,由六篇论文组成 ,分别从不同的视角讨论了文学伦理学批评。聂珍钊教授从总体上对文学伦理学批评的起源、方法、内涵、思想基础、适用范围、实用价值和现实意义进行了论述。克努特教授以易卜生的戏剧为例 ,不仅讨论了易卜生戏剧中的伦理道德问题 ,而且还就文学伦理学发表了自己的重要意见。王宁教授把生态批评同文学伦理学批评结合在一起 ,为我们提供了这种批评同其它批评相结合的范例。刘建军教授以人对自身认识的发展所经历的三个时期为基础 ,用比较的和多学科的观点对文学伦理学批评作了进一步阐释。乔国强教授的论文在一个广阔的思想空间里 ,对文学伦理学批评的定义、思想与理论基础 ,对作家、作品以及读者的价值取向等方面深入阐释了自己的学术见解。邹建军教授从文学伦理学批评的三维指向讨论了它的历史价值、现实意义和方法论启示。这些论文企图说明 ,在目前中国的文学批评出现伦理道德价值缺位的时候 ,我们的文学批评应该肩负起道德责任 ,以实现文学伦理道德价值的回归 ,而文学伦理学批评就是达到这一目标的重要途径。

关键词：易卜生戏剧评论道德观道德规范

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