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Investigating bulk mechanical properties on a micro-scale: Micro-tensile testing of ultrafine grained Ni-SiC composite to determine its fracture mechanism and strain rate sensitivity
Xu, A; Yang, C; Thorogood, G; Bhattacharyya, D
2020
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume817Pages:-
Subtype期刊论文
AbstractIn this study, in-situ micro-tensile testing technique was used to investigate the mechanical properties of ultrafine grained Ni-3wt% SiC composite the size effect on the mechanical properties of the ultrafine grained Ni-3wt% SiC composite, and to further reveal the reasons for the low ductility of the bulk Ni-3wt %SiC composite. Dog-bone micro-tensile samples were manufactured using a Focused Ion Beam (FIB) milling machine to 15 mu m length with a cross sectional area of 5 mu m by 5 mu m. The micro-tensile samples are pulled in tension at a quasi-static strain rate of 0.000087/s (LSR) and a relatively faster strain rate of 0.011/s (HSR). Analysis of experimental stress-strain plots for the LSR tests measured yield stress, ultimate tensile stress and modulus values that approach values previously reported for bulk/macro-level tensile tests. However, the elongation and fracture energy at the micro-level is approximately half that at the bulk scale. This discrepancy is attributed to the presence of unwanted carbon and silicon oxide impurities similar to 1.5 mu m in diameter which act as stress concentrators especially given their large size relative to the width of the tensile specimens. The composition of these impurities was validated by transmission electron microscopy, and they seem to be the most likely cause of low ductility of the Ni-3wt% SiC composite. In all, the study undertaken here was able to replicate mechanical properties observed at the macro scale as well as reproduce a strain rate effect. Furthermore, the failure mode of Ni-3wt% SiC composite was identified and analysed in detail. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
KeywordPURE NICKEL MICROSTRUCTURE DEFORMATION BEHAVIOR SIZE FE NANOCRYSTALLINE COMPRESSION TEMPERATURE SPECIMEN
DOI10.1016/j.jallcom.2019.152774
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32955
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Australian Nucl Sci & Technol Org, Nucl Fuel Cycle Res, New Illawarra Rd, Lucas Heights, NSW 2234, Australia
2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China
4.Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
Recommended Citation
GB/T 7714
Xu, A,Yang, C,Thorogood, G,et al. Investigating bulk mechanical properties on a micro-scale: Micro-tensile testing of ultrafine grained Ni-SiC composite to determine its fracture mechanism and strain rate sensitivity[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,817:-.
APA Xu, A,Yang, C,Thorogood, G,&Bhattacharyya, D.(2020).Investigating bulk mechanical properties on a micro-scale: Micro-tensile testing of ultrafine grained Ni-SiC composite to determine its fracture mechanism and strain rate sensitivity.JOURNAL OF ALLOYS AND COMPOUNDS,817,-.
MLA Xu, A,et al."Investigating bulk mechanical properties on a micro-scale: Micro-tensile testing of ultrafine grained Ni-SiC composite to determine its fracture mechanism and strain rate sensitivity".JOURNAL OF ALLOYS AND COMPOUNDS 817(2020):-.
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