التفاصيل البيبلوغرافية
| العنوان: |
MOLECULAR DYNAMICS SIMULATION OF TENSILE DEFORMATION OF NANOMETER MULTILAYER Cu/Ta MATERIALS. |
| العنوان البديل: |
MOLEKULARNO DINAMSKE SIMULACIJE NATEZNO DEFORMIRANIH NANOMETERSKIH VEČPLASTNIH MATERIALOV NA OSNOVI BAKRA IN TANTALA. (Slovenian) |
| المؤلفون: |
Hu Jianian, Zhang Haotian, Zhu Youlin, Li Peibo, Luo Guoqiang, Wang Chuanbin, Shen Qiang, Zhang Lianmeng |
| المصدر: |
Materials & Technologies / Materiali in Tehnologije; Jul/Aug2022, Vol. 56 Issue 4, p415-422, 8p |
| مصطلحات موضوعية: |
COPPER, COMPOSITE materials, TENSILE strength, DEFORMATIONS (Mechanics), MOLECULAR dynamics |
| الملخص (بالإنجليزية): |
In this research, the tensile mechanical properties and microstructure evolution of Cu/Ta nanolayered composites were studied using the molecular dynamics simulation method. By analyzing the tensile stress/strain relationship of Cu/Ta with different interface structures and the movement of dislocations during the stretching process, the deformation mechanism of materials with different interface structures and the effect of interface structures on the tensile strength of Cu/Ta nanolayered composites are revealed. The effect of shear localization during extension is also analyzed. The results show that the dislocation structures at the interfaces of Kurdjumov-Sachs-type and Nishiyama-Wasserman-type samples are parallelogram and triangular interface defect arrays, respectively, which can easily induce two Shockley partial dislocations to slide along different (111) planes, forming an intersection and merging into ladder-rod dislocations. However, dislocations between the Kurdjumov-Sachs {112}-type sample interfaces exhibit parallel array characteristics, while the interfacial dislocations have non-planar interface components, which can induce deformation twinning. The process is dissociated through a set of intrinsic interfacial dislocations. Shockley partial dislocations are then formed by dislocation motion, creating stacking faults (SF1), and then the second set of partial dislocations may nucleate from the interface and slide on the adjacent SF1 plane, eventually forming deformation twinning. [ABSTRACT FROM AUTHOR] |
| Abstract (Slovenian): |
Avtorji opisujejo natezne mehanske lastnosti in razvoj mikrostrukture večplastnih Cu/Ta nano-kompozitov s pomočjo metod molekularno-dinamske simulacije. Z analiziranjem zveze med natezno napetostjo in deformacijo Cu/Ta z različno strukturo mejnih ploskev in gibanjem dislokacij med procesom raztezanja so avtorji odkrili kakšen je deformacijski mehanizem materialov z različno strukturo mejnih ploskev in njihov vpliv na natezno trdnost večplastnih Cu/Ta nano-kompozitov. Ugotavljali so kakšen je deformacijski mehanizem in vpliv lokaliziranega striga med raztezanjem. Rezultati raziskave kažejo na to, da so strukture vzorcev dislokacij na mejnih ploskvah Kurdjumov-Sachsovega in Nishiyama-Wassermanovega tipa s tri- in štirikotno ureditvijo napak na mejnih ploskvah. To lahko enostavno sproži (inducira) dve Shockleyjevi parcialni dislokaciji, ki zdrsita vzdolž različnih (111) ravnin in tvorita presečišče dislokacij z obliko zložljivih lestev. Vendar vzorci dislokacij Kurdjumov-Sachsovega {112}-tipa na mejnih ploskvah kažejo značilno vzporedno razporeditev. Pri tem imajo mejne dislokacije neplanarne (neravninske oz. 3d) komponente, ki lahko inducirajo deformacijo z dvojčenjem. Proces poteka z razdruževanjem vrste notranjih mejnih dislokacij. Pri tem nastajajo Shockleyjeve parcialne dislokacije, ki tvorijo napake zloga (SF1). Nato lahko nastane (nukleira) še drugi set parcialnih dislokacij na mejnih ploskvah in zdrs na sosednje SF1 ravnine, kar lahko privede do deformacije z dvojčenjem. [ABSTRACT FROM AUTHOR] |
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