Transmission of a screw dislocation across a coherent, non-slipping interface

Transmission of a screw dislocation across a coherent, non-slipping interface
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螺型位错在相干、非滑移界面上的传递

DOI:
10.1016/j.jmps.2006.11.005
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发表时间:
2007-05
影响因子:
5.3
通讯作者:
Shen, Yao
Shen, Yao
中科院分区:
工程技术2区
文献类型:
--
作者:
Anderson, Peter M.;Shen, Yao

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目前对纳米金属和纳米多层薄膜的研究表明,非凡的塑性强度是由于滑移限制在单个晶粒或层中。为了评估限制的大小,螺旋位错的滑移传输的佩尔斯模型通过一个连贯的,非滑移界面。结果表明,由于弹性模量失配、堆垛层错能失配和反相界面能导致界面附近位错线能量的快速波动,从而导致界面势垒的增大。内聚应力预计将显着改变位错核心配置,并赋予额外的强度,无论符号。强度的贡献是不加性的,由于通过位错核心配置的非线性耦合。预测的势垒强度为连贯的(001)铜/镍界面原子(EAM)的结果,但大于硬度数据的估计。
Current research on nanocrystalline metals and nanoscale multilayer thin films suggests extraordinary plastic strength is due to confinement of slip to individual grains or layers. To assess the magnitude of confinement, a Peierls model of slip transmission of a screw dislocation across a coherent, non-slipping interface is presented. The results reflect that large interfacial barriers to transmission are generated by rapid fluctuations in dislocation line energy near the interface due to elastic modulus mismatch, stacking fault energy mismatch, and antiphase boundary energy for transmission into an ordered phase. Coherency stress is predicted to dramatically alter the dislocation core configuration and impart additional strength regardless of the sign. Contributions to strength are not additive due to nonlinear coupling via the dislocation core configuration. The predicted barrier strength for a coherent (001) Cu/Ni interface is comparable to atomistic (EAM) results but larger than estimates from hardness data.
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发表时间: 1993-05
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