Abstract Coupling of nano-indentation and crystal plasticity finite element (CPFE) simulations is widely used to quantitatively probe the small-scale mechanical behaviour of materials. Earlier studies showed that CPFE can successfully reproduce the load-displacement curves and surface morphology for different crystal orientations. Here, we report the orientation dependence of residual lattice strain patterns and dislocation structures in tungsten. For orientations with one or more Burgers vectors close to parallel to the sample surface, dislocation movement and residual lattice strains are confined to long, narrow channels. CPFE is unable to reproduce this behaviour, and our analysis reveals the responsible underlying mechanisms.

中文翻译：

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纯钨纳米压痕行为的取向依赖性

摘要 纳米压痕与晶体塑性有限元（CPFE）模拟的耦合被广泛用于定量探测材料的小尺度力学行为。早期的研究表明，CPFE 可以成功再现不同晶体取向的载荷-位移曲线和表面形貌。在这里，我们报告了钨中残余晶格应变模式和位错结构的取向依赖性。对于一个或多个 Burgers 矢量接近平行于样品表面的方向，位错运动和残余晶格应变被限制在长而窄的通道中。CPFE 无法重现这种行为，我们的分析揭示了负责任的潜在机制。