Haizheng Pan, Ye Yuan, Yuliang Yang, Zhufeng He, Shuang Jiang, Mingwei Zhu, Weiye Chen, Nan Jia
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At the grain scale, dense twins and twin–twin network, laths featured with local chemical order as well as dislocation cells jointly hinder plastic deformation. At the nanoscale, the chemical order within grains also impedes dislocation motion. During plastic deformation, different sample positions within the heterogeneous material and various regions at each position undergo coordinated deformation, resulting in significant hetero-deformation induced strengthening. Simultaneously, the continuously activated dislocations, stacking faults and nano-twins lead to a high yield strength of 1020 MPa in the material while maintaining a fracture elongation of 30%. 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引用次数: 0
摘要
具有面心立方(fcc)结构的成分复杂合金(CCAs)在从低温到室温的广泛温度范围内表现出优异的断裂韧性和稳定的机械性能。然而,这些合金的屈服强度通常较低,难以满足实际工程应用的要求。在标称化学成分为 Co10Cr10Fe49Mn30N1(原子百分比)的 CCA 原型中,通过对块状合金进行三轴循环压缩和短期退火,获得了从样品到原子尺度的多尺度异质结构。该材料在样品尺度上呈现出应变的异质分布。在晶粒尺度上,致密孪晶和孪晶网络、具有局部化学有序性的板条以及位错单元共同阻碍了塑性变形。在纳米尺度上,晶粒内的化学有序也阻碍了位错运动。在塑性变形过程中,异质材料中的不同试样位置以及每个位置上的不同区域都会发生协调变形,从而导致显著的异质变形诱导强化。同时,持续激活的位错、堆积断层和纳米孪晶使材料的屈服强度高达 1020 兆帕,而断裂伸长率保持在 30%。这项研究为高性能金属材料的设计和开发提供了新的见解。
Multi-scaled heterostructure enables superior strength–ductility combination of a CoCrFeMnN compositionally-complex alloy
Compositionally-complex alloys (CCAs) with the face-centered cubic (fcc) structure exhibit excellent fracture toughness and stable mechanical property across a broad temperature range from cryogenic to room temperatures. However, yield strength of those alloys is usually low, making them difficult to meet the demands of practical engineering application. In a prototype CCA with the nominal chemical composition of Co10Cr10Fe49Mn30N1 (atom percent), a multi-scaled heterostructure from sample to atomic scales was obtained by performing triaxial cyclic compression and short-term annealing on the blocky alloy. The material exhibits a heterogeneous distribution of strain at the sample scale. At the grain scale, dense twins and twin–twin network, laths featured with local chemical order as well as dislocation cells jointly hinder plastic deformation. At the nanoscale, the chemical order within grains also impedes dislocation motion. During plastic deformation, different sample positions within the heterogeneous material and various regions at each position undergo coordinated deformation, resulting in significant hetero-deformation induced strengthening. Simultaneously, the continuously activated dislocations, stacking faults and nano-twins lead to a high yield strength of 1020 MPa in the material while maintaining a fracture elongation of 30%. This study provides new insights for the design and development of high-performance metallic materials.
期刊介绍:
Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.