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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Atomistic Simulations of Steps in Bimetallic Interfaces as Barriers to Interface Slip Transmission
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Atomistic Simulations of Steps in Bimetallic Interfaces as Barriers to Interface Slip Transmission

机译：双金属界面中台阶作为界面滑移传输障碍的原子模拟

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摘要

Atomistic models of coherent interfaces in the CuNi system with and without (11 l)-steps were used to study slip transmission across interfaces in CuNi metallic bilayers. The lattice mismatch of the CuNi system results in large coherency stresses at the interface. The (11 l)-steps afford a larger barrier to slip than the flat, coherent interface. The coherent flat interface dislocation barrier is largely due to the large compressive stresses in the Cu layer that must be overcome by applied tensile stresses. Additional Koehler forces are present as the dislocation in the elastically softer Cu approaches the stiffer Ni layer. The step, however, possesses a small residual edge dislocation with a Burgers vector equal to the difference of bc_u and b_(Ni) times the height of the (11 l)-step in (11 l)-layers. We find that these steps are potent slip barriers, which suggests that homogeneous slip is preferred in such systems.
机译：使用CuNi系统中具有和不具有（11 l）步骤的相干界面的原子模型来研究CuNi金属双层中跨界面的滑动传递。 CuNi体系的晶格失配导致界面处的相干应力很大。 （11 l）台阶提供了比平坦，连贯的界面更大的滑动障碍。相干的平面界面位错势垒主要是由于必须通过施加张应力来克服的铜层中较大的压应力。当弹性较软的Cu中的位错接近较硬的Ni层时，会出现其他的Koehler力。但是，该台阶具有较小的残留边缘位错，其Burgers向量等于bc_u和b_（Ni）的差乘以（11 l）层中（11 l）台阶的高度。我们发现这些步骤是有效的滑动屏障，这表明在这种系统中均匀滑动是优选的。

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