Influences of symmetric tilt grain boundary on the stretching deformation behaviors of Cu bicrystals

被引:0
作者
Fang, Xiaotian [1 ]
Chen, Juan [1 ]
Chen, Huiqin [1 ]
Fang, Liang [2 ,3 ]
Sun, Kun [3 ]
Shi, Tenglong [1 ]
机构
[1] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030003, Shanxi, Peoples R China
[2] Xiamen Univ, Tan Kah Kee Coll, Sch Mech & Elect Engn, Zhangzhou 363105, Peoples R China
[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源
MATERIALS TODAY COMMUNICATIONS | 2024年 / 41卷
基金
山西省青年科学基金;
关键词
Uniaxial tension; Symmetric tilt GB; Bicrystal; Plastic deformation behaviors; Molecular dynamics simulation; NANOCRYSTALLINE METALS; DISLOCATION NUCLEATION; DYNAMICS; STRENGTH; ALUMINUM; PLASTICITY; INTERFACES; MECHANISM; PRESSURE; FATIGUE;
D O I
10.1016/j.mtcomm.2024.110454
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microstructure of grain boundary (GB) becomes an important factor affecting the strength of nanomaterials during plastic deformation. In this work, Cu bicrystals with different coincidence site lattice (CSL) interfaces are constructed, and the influences of the symmetric tilt interface on the mechanical properties and plastic deformation behaviors during uniaxial tension are studied by molecular dynamics simulation. The results indicate that the peak stress of tensile stress-strain curves for most bicrystals is lower than its monocrystalline samples, except CSL3, CSL11 and CSL57 bicrystals with a continuous and single structural unit. The CSL3 bicrystal has the highest strength, while CSL33 bicrystal has the lowest strength among all the tested samples. The CSL11 and CSL57 bicrystals with a lower GB energy have a higher stability of interface, which delays the yielding. Moreover, the generation of twin and stair-rod dislocation at the interfaces strengthens the CSL11 and CSL57 bicrystals. The CSL3 almost has the same parameters as its monocrystalline sample S3, massive research has confirmed that the sample with a higher density twin (CSL3 interface) exhibits higher combined properties of strength and plasticity. This work may provide a guideline for GB engineering to improve material properties by controlling the GB structure.
引用
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页数:9
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