论文标题
纯钨的纳米识别行为的方向依赖性
Orientation dependence of the nano-indentation behaviour of pure tungsten
论文作者
论文摘要
纳米识别和晶体可塑性有限元（CPFE）模拟的耦合被广泛用于定量探测材料的小规模机械行为。较早的研究表明，CPFE可以成功地重现不同晶体取向的载荷 - 位置曲线和表面形态。在这里，我们报告了钨中残留的晶格应变模式和脱位结构的取向依赖性。对于接近样品表面平行的一个或多个汉堡向量的方向，位错运动和残留的晶格菌株仅限于长而狭窄的通道。 CPFE无法再现这种行为，我们的分析揭示了负责任的潜在机制。
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.
