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首页> 外文期刊>Philosophical Magazine Letters >On elastic-viscoplastic modeling of nanotwinned metals based on coupled intra-twin and twin-boundary-mediated deformation mechanisms
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On elastic-viscoplastic modeling of nanotwinned metals based on coupled intra-twin and twin-boundary-mediated deformation mechanisms

机译：基于双胞内和双边界介导的变形机制的纳米孪晶金属的粘弹塑性建模

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摘要

An elastic-viscoplastic model has been developed for nanotwinned (nt) metals based on coupled intra-twin and twin-boundary-mediated (TBM) deformation mechanisms. The grain-size dependence of intra-twin plasticity was incorporated in the proposed model to determine the transitional twin thickness corresponding to the maximum strength. In addition, the joint distribution of grain size and twin thickness was also taken into account to simulate the microstructure of nt metals. The results obtained show that the TBM deformation mechanism dominated at low strain rate and small twin thickness, and that the grain-size and twin-thickness distributions had significant influence on the macroscopic behavior of nt metals. A linear relation between the transitional twin thickness and grain size is predicted by the proposed model, which is in good agreement with the results obtained from three-dimensional molecular dynamics simulations and experiments.View full textDownload full textKeywordsnanotwinned metals, strain rate sensitivity, transitional twin thickness, dislocation pile-up, twin-boundary migrationRelated 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/10.1080/09500839.2012.720388
机译：基于双胞胎内部和双边界介导的（TBM）变形机理，为纳米双胞胎（nt）金属开发了弹性-粘塑性模型。孪晶内塑性对晶粒尺寸的依赖性被纳入所提出的模型中，以确定对应于最大强度的过渡孪晶厚度。此外，还考虑了晶粒尺寸和孪晶厚度的联合分布，以模拟nt金属的微观结构。结果表明，TBM变形机理在低应变速率和较小的孪晶厚度下占主导地位，并且晶粒尺寸和孪晶厚度分布对nt金属的宏观行为有重大影响。所提出的模型预测了过渡孪晶厚度与晶粒尺寸之间的线性关系，这与三维分子动力学模拟和实验所获得的结果非常吻合。查看全文下载全文关键词无配位金属，应变率敏感性，过渡孪晶厚度，位错堆积，双边界迁移相关var addthis_config = {ui_cobrand：“泰勒和弗朗西斯在线”，service_compact：“ citeulike，netvibes，twitter，technorati，delicious，linkedin，facebook，stumbleupon，digg，google，更多”， pubid：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/09500839.2012.720388

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