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80篇 您的检索式:作者名="Roven"
    题名 作者 年代 出处 被引量
1高压扭转大塑性变形Al-Mg铝合金中的层错和形变孪晶显示文摘利用高分辨透射电镜研究高压扭转大塑性变形纳米结构Al-Mg铝合金中的位错、层错和形变孪晶。结果表明:在纳米晶和超细晶内均存在高密度的层错和形变孪晶;形成层错的Shockley部分位错可分别由0°纯螺型位错和60°混合位错分解得到;纳米孪晶既可由晶内层错动态叠加而形成,也可由晶界向晶内不断发射部分位错而向晶内长大,从而分别实验证实了分子动力学模拟预测的均质和非均质形核长大的孪生机制;观察到了由4层层错动态叠加而形成的特殊纳米孪晶。此外,高分辨透射电镜观察表明:在不同滑移面上的层错相交时,形成层错而产生的拖曳部分位错相遇可反应生成压杆位错和Lomer-Cottrell位错锁。依据经典位错理论和晶界发射部分位错的机制,提出了描述超细晶面心立方金属和合金中层错和形变孪晶形核长大的新模型。刘满平 王俊 蒋婷慧 吴振杰 谢学锋 刘强 Hans J. ROVEN 2014中国有色金属学报2014,24,6:14
2等通道挤压变形结合中间退火制备Al-7Mg合金的组织、硬度演变及热稳定性(英文)显示文摘在室温条件下采用Bc模式等通道挤压变形(ECAP)结合中间退火方法制备二元Al—7Mg合金。经6道次ECAP变形后,该材料硬度高达HV218。透射电镜(TEM)表征揭示该Al—7Mg合金的晶粒得到明显细化。经5或6道次变形后得到的超细晶组织平均尺寸为100~200nm。X射线衍射分析表明Mg主要以固溶原子的形式存在。因此,由于Mg偏析或析出相造成的可能强化影响均忽略不计。经6道次ECAP变形后的A1-7Mg合金的高硬度主要来自于晶界强化,大约占总强度的41%,其次,位错强化及Mg原子的固溶强化分别约占总强度的24%和35%。此外,通过测量硬度变化研究了该A1—7Mg合金的热稳定性。结果表明在250℃退火处理时该材料相对稳定,然而当温度升至300℃时,该Al—7Mg合金的软化趋势明显加快。查敏 李彦军 Ragnvald MATHIESEN Ruben BJRGE Hans J. ROVEN 2014Transactions of Nonferrous Metals Society of China2014,24,7:8
3一种新螺杆挤压法从6063铝合金和Mg混合颗粒制备Al/Mg复合材料(英文)显示文摘采用一种新的螺杆挤压法以AA6063合金和工业纯Mg混合颗粒为原料制备Al/Mg双金属复合材料。加入铝合金中的镁合量最高可达到12.5%(质量分数)。所制备复合材料由细小晶粒组织组成。其显微组织中除有原料中的物相外,还观察到由γ-Mg17Al12包围的岛状Al2Mg3金属间合物。复合材料的强度随Mg含量的增加逐渐增高。含Mg为10%复合材料的极限抗拉强度最高,超过350 MPa。断裂表面分析结果表明,增加Mg含量导致材料发生较严重的脆性断裂及断裂机制的较小变化。因此,应对挤压工艺条件进行进一步优化。Kristian Gr tta SKORPEN Eirik MAUL Oddvin REISO Hans J rgen ROVEN 2014Transactions of Nonferrous Metals Society of China2014,24,12:4
4Schur convexity of a class of symmetric functions显示文摘Roven A L 2010Annals of the University of craiova Mathematics and Computer Science Series2010,37,1:1
5The effects of deformation conditions on microstructure and texture of commercially pure Ti显示文摘Zeng Z Jonsson S Roven H J 0,,:1
6Cyclic deformation of ferritic steel-Ⅱ :stage Ⅱ crack propagation显示文摘Roven H J Nes E 1991Acta Metall Mater1991,39,8:1
7The effects of deformation conditions on microstructure and texture of commercially pure Ti显示文摘ZENG Zhi-peng Jonsson S Roven H J 2009Acta Materialia2009,57,19:1
8The effects of deformationconditions on microstructure and texture of commercially pureTi显示文摘ZENG Z JONSSON S ROVEN H J 2009Acta Materialia2009,57,:1
9Network-shaped fine-grained microstructure and high ductility of magnesium alloy fabricated by cyclic extrusion compression显示文摘Y.J. Chen Q.D. Wang H.J. Roven M.P. Liu M. Karlsen Y.D. Yu J. Hjelen 2007Scripta Materialia2007,,4:1
10Quantitative analysis of grain refinement in titanium during equal channel angular pressing 显示文摘CHEN Y J LI Y J WALMSLEY J C DUMOULIN S GIREESH S S ARMADA S SKARET P C ROVEN H J 2011Scripta Mater2011,64,:1
11Strain localization in solution heat treated Al - Zn - Mg alloy 显示文摘Fjeldly H Roven J Rauch E 2001Materials Science and Engineering A2001,380,:1
12Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression显示文摘CHEN Y J WANG Q D ROVEN H J 2008Journal of Alloy and Compounds2008,462,:1
13Quantitative study of grain refinement in AI-Mg alloy processed by equal channel angular pressing at cryogenic temperature 显示文摘CHEN Y J ROVEN H J GIREESH S S SKARET P C HJELEN J 2011Materials Letters2011,65,:1
14Grain refining and improving mechanical properties of a warm rolled AZ31 alloy plate显示文摘Hua Zhang Wei Jin Jianfeng Fan Weili Cheng Hans J?rgen Roven Bingshe Xu Hongbiao Dong 2014Materials Letters2014,,:1
15Anterior cervical osteophytes re- suiting in sewre dysphagia and aspiration:two case reports and literature review显示文摘Kos MP van Roven B J David EF 2009J LaD''ngol Otol2009,123,10:1
16The effects of deformation conditions on microstructure and texture of commercially pure Ti显示文摘Zhipeng Zeng Stefan Jonsson Hans J?rgen Roven 2009Acta Materialia2009,,19:1
17Optimization of EBSD parameters for ultra-fast characterization 显示文摘CHEN Y J HJELEN J GIREESH S S ROVEN H J 2012Journal of Microscopy2012,245,:1
18Mechanical properties of aluminium alloys processed by SPD Comparison of different alloy systems and possible product areas显示文摘ROVEN H J NESBOE H WERENSKIOLD J C SEIBERT T 2005Mater Sci Eng2005,,:1
19Dynamic precipitation during severe plastic deformation of an A1-Mg-Si aluminum alloy显示文摘Roven H Liu M P Werenskiold J 2008Materials Science and Engineering A2008,48,:1
20Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression 显示文摘CHEN Y J WANG Q D ROVEN H J KARLSEN M YU Y D LIU M P HJELEN J 2008J Alloy Compd2008,462,:1
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