论文标题
高渗透合金中生涩的脱位运动的起源
The origin of jerky dislocation motion in high-entropy alloys
论文作者
论文摘要
单相浓缩合金中的位错（包括高熵合金（HEAS））在滑行过程中反复遇到，导致脱位脱位运动。虽然在常规合金中可以很好地理解溶质 - 脱位相互作用，但集中随机合金中单个固定点的起源是一个争论的问题。在这项工作中，我们调查了固定在Cocrfemnni Hea中的位错的起源。内置透射电子显微镜研究揭示了波浪状脱位线和在外部载荷下的锯齿状滑行运动，即使在冲击部分局部脱位周围未发现分离或聚类。原子模拟重现了生涩的脱位运动，并将重复的固定固定与PEIERLS摩擦中的局部波动联系起来。我们证明，高局部PEIERLS摩擦的密度与脱位滑行和脱位迁移率所需的临界应力成正比。
Dislocations in single-phase concentrated random alloys, including high- entropy alloys (HEAs), repeatedly encounter pinning during glide, resulting in jerky dislocation motion. While solute-dislocation interaction is well understood in conventional alloys, the origin of individual pinning points in concentrated random alloys is a matter of debate. In this work, we investigate the origin of dislocation pinning in the CoCrFeMnNi HEA. In- situ transmission electron microscopy studies reveal wavy dislocation lines and a jagged glide motion under external loading, even though no segregation or clustering is found around Shockley partial dislocations. Atomistic simulations reproduce the jerky dislocation motion and link the repeated pinning to local fluctuations in the Peierls friction. We demonstrate that the density of high local Peierls friction is proportional to the critical stress required for dislocation glide and the dislocation mobility.
