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Revisiting the intra-granular dislocation extension model for flow stress in nanocrystalline metals

机译:重新审视纳米晶金属中流动应力的晶内位错扩展模型

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In our previous work (R.J. Asaro, P. Krysl and B. Kad, Philos. Mag. Lett. 83 (2003) p.733; P. Gu, B. Kad and M. Dao, Scr. Mater. 62 (2010) p.361), the intra-granular partial dislocation extension model was shown to be consistent with the experimental data of flow stress in nanocrystalline FCC materials. However, since the averaged extension was taken for a non-uniform loop, the model predicted small dislocation extension across the grain. In this article, extending our previous work, we reformulate the intra-granular partial dislocation model for FCC nanocrystalline materials using a more realistic loop. The flow stress obtained from the reformulated model shows good agreement with experimental data for various nanocrystalline FCC materials and expectedly large dislocation extension across the grain. In the second portion of this article, the mechanistic model for partial dislocation extension is extended to develop an intra-granular perfect dislocation extension model. The perfect dislocation model is examined by comparing its prediction of flow stress with experimental data of nanocrystalline Fe. Additionally, activation volume and strain-rate sensitivity are discussed within the mechanistic model in the light of available experimental data on nanocrystalline Fe.View full textDownload full textKeywordsnanograined structures, flow stress, intra-granular dislocation extensionRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500839.2011.637975
机译:在我们之前的工作中(RJ Asaro,P.Krysl和B.Kad,Philos.Mag.Lett.83(2003)p.733; P.Gu,B.Kad和M.Dao,Scr.Mater.62(2010) p.361),显示了晶内部分位错扩展模型与纳米晶FCC材料中流变应力的实验数据一致。但是,由于平均延伸是针对不均匀的环进行的,因此该模型预测了整个晶粒上的小位错延伸。在本文中,扩展了我们以前的工作,我们使用了更现实的循环来重新构造了FCC纳米晶体材料的颗粒内部分位错模型。从重新制定的模型获得的流变应力与各种纳米晶FCC材料的实验数据显示出良好的一致性,并且预期在整个晶粒上有较大的位错扩展。在本文的第二部分,扩展了部分位错扩展的力学模型,以开发出颗粒内完美位错扩展模型。通过将其流变应力的预测值与纳米晶铁的实验数据进行比较,检验了理想的位错模型。此外,根据纳米晶铁上的可用实验数据,在力学模型中讨论了激活量和应变速率敏感性。查看全文下载全文关键词纳米结构,流动应力,晶内位错扩展相关var addthis_config = {ui_cobrand:“ Taylor&弗朗西斯在线”,services_compact:“ citeulike,netvibes,twitter,technorati,美味,linkedin,facebook,stumbleupon,digg,google,更多”,发布号:“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/09500839.2011.637975

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