The Competition Between Deformation Twinning and Dislocation Slip in Deformed Face-Centered Cubic Metals
The Competition Between Deformation Twinning and Dislocation Slip in Deformed Face-Centered Cubic Metals
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DOI：
10.1007/s11837-022-05437-3
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发表时间：
2022-08-15
期刊：
影响因子：
2.6
通讯作者：
Daly, Matthew
中科院分区：
文献类型：
--
作者：
Jagatramka, Ritesh;Daly, Matthew
形变孪晶与位错滑移之间的竞争是面心立方材料细观塑性演化的基础。虽然这些机制之间的竞争是已知的广义平面断层能量景观的关键特征，跟踪扩展塑性的竞争的物理理论尚未出现。在这里，我们报告了一种方法来预测变形晶体中这种竞争的介观演化。我们的方法实现了动力学蒙特卡罗模拟检查故障结构的演变，在面心立方金属使用固有的材料参数作为输入。利用这些结果推导出一个分析模型的断层分数，断层密度和分区之间的变形机制的塑性应变的演变。此外，我们定义了一个竞争参数，测量变形孪晶和位错滑移的趋势。与以前的“孪生性”参数相比，我们的推导考虑变形的历史，当检查机制的竞争。因此，这一贡献扩展了变形孪晶理论的范围超出了初期成核事件。这些产品在加工硬化和晶体塑性模型中找到了直接应用，这些模型以前依赖于唯象关系来预测变形孪晶微观结构的介观演化。
The competition between deformation twinning and dislocation slip underpins the evolution of mesoscale plasticity in face-centered cubic materials. While competition between these mechanisms is known to be related to the critical features of the generalized planar fault energy landscape, a physical theory that tracks competition over extended plasticity has yet to emerge. Here, we report a methodology to predict the mesoscale evolution of this competition in deformed crystals. Our approach implements kinetic Monte Carlo simulations to examine fault structure evolution in face-centered cubic metals using intrinsic material parameters as inputs. These results are leveraged to derive an analytical model for the evolution of the fault fraction, fault densities and partitioning of plastic strains among deformation mechanisms. In addition, we define a competition parameter that measures the tendencies for deformation twinning and dislocation slip. In contrast to previous 'twinnability' parameters, our derivation considers deformation history when examining mechanism competition. This contribution therefore extends the reach of deformation twinning theory beyond incipient nucleation events. These products find direct applications in work hardening and crystal plasticity models, which have previously relied on phenomenological relations to predict the mesoscale evolution of deformation twin microstructures.