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Effect of metalloid silicon addition on densification, microstructure and thermal-physical properties of Al/diamond composites consolidated by spark plasma sintering
Alternative TitleMater. Des.
Zhang, Yang1; Li, Jianwei1; Zhao, Lili2; Zhang, Hailong1; Wang, Xitao1
2014-11-01
Source PublicationMATERIALS & DESIGN
ISSN0261-3069
Volume63Issue:NOV.Pages:838-847
AbstractAluminum matrix composites reinforced with diamond particles were consolidated by spark plasma sintering. Metalloid silicon was added (Al-Si/diamond composites) to investigate the effect. Silicon addition promotes the formation of molten metal during the sintering to facilitate the densification and enhance the interfacial bonding. Meanwhile, the alloying metal matrix precipitates the eutectic-Si on the diamond surfaces acting as the transitional part to protect the improved interface during the cooling stage. The improved interface and precipitating eutectic-Si phase are mutually responsible for the optimized properties of the composites. In this study, for the Al-Si/diamond composite with 55 vol.% diamonds of 75 mu m diameter, the thermal conductivity increased from 200 to 412 Wm(-1) K-1, and the coefficient of thermal expansion (CTE) decreased from 8.9 to 7.3 x 10(-6) K-1, compared to the Al/diamond composites. Accordingly, the residual plastic strain was 0.10 x 10(-3) during the first cycle and rapidly became negligible during the second. Additionally, the measured CTE of the Al-Si/diamond composites was more conform to the Schapery's model. (C) 2014 Elsevier Ltd. All rights reserved.; Aluminum matrix composites reinforced with diamond particles were consolidated by spark plasma sintering. Metalloid silicon was added (Al-Si/diamond composites) to investigate the effect. Silicon addition promotes the formation of molten metal during the sintering to facilitate the densification and enhance the interfacial bonding. Meanwhile, the alloying metal matrix precipitates the eutectic-Si on the diamond surfaces acting as the transitional part to protect the improved interface during the cooling stage. The improved interface and precipitating eutectic-Si phase are mutually responsible for the optimized properties of the composites. In this study, for the Al-Si/diamond composite with 55 vol.% diamonds of 75 mu m diameter, the thermal conductivity increased from 200 to 412 Wm(-1) K-1, and the coefficient of thermal expansion (CTE) decreased from 8.9 to 7.3 x 10(-6) K-1, compared to the Al/diamond composites. Accordingly, the residual plastic strain was 0.10 x 10(-3) during the first cycle and rapidly became negligible during the second. Additionally, the measured CTE of the Al-Si/diamond composites was more conform to the Schapery's model. (C) 2014 Elsevier Ltd. All rights reserved.
KeywordMetal Matrix Composites Metalloid Silicon Densification Behavior Thermal Conductivity Coefficient Of Thermal Expansion Thermal Dimensional Stability
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.matdes.2014.06.065
URL查看原文
Indexed BySCI
Language英语
WOS KeywordALUMINUM-MATRIX COMPOSITES ; EXPANSION BEHAVIOR ; DIAMOND/ALUMINUM COMPOSITES ; NONCONDUCTING INCLUSIONS ; ELECTRICAL-CONDUCTIVITY ; BOUNDARY CONDUCTANCE ; DIAMOND SURFACE ; SIC PARTICLES ; INTERFACE ; TI
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000340949300099
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Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11618
Collection研究所(批量导入)
Affiliation1.Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Yang,Li, Jianwei,Zhao, Lili,et al. Effect of metalloid silicon addition on densification, microstructure and thermal-physical properties of Al/diamond composites consolidated by spark plasma sintering[J]. MATERIALS & DESIGN,2014,63(NOV.):838-847.
APA Zhang, Yang,Li, Jianwei,Zhao, Lili,Zhang, Hailong,&Wang, Xitao.(2014).Effect of metalloid silicon addition on densification, microstructure and thermal-physical properties of Al/diamond composites consolidated by spark plasma sintering.MATERIALS & DESIGN,63(NOV.),838-847.
MLA Zhang, Yang,et al."Effect of metalloid silicon addition on densification, microstructure and thermal-physical properties of Al/diamond composites consolidated by spark plasma sintering".MATERIALS & DESIGN 63.NOV.(2014):838-847.
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