Strengthening mechanism in graphene nanoplatelets reinforced aluminum composite fabricated through spark plasma sintering

被引：234

作者：

Bisht, Ankita ^{[1
]}

Srivastava, Mukul ^{[1
,2
]}

Kumar, R. Manoj ^{[1
]}

Lahiri, Indranil ^{[2
]}

Lahiri, Debrupa ^{[1
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Met & Mat Engn, Biomat & Multiscale Mech Lab, Uttarakhand 247667, India

[2] Indian Inst Technol Roorkee, Dept Met & Mat Engn, Nanomat & Applicat Lab, Uttarakhand 247667, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 695卷

关键词：

Graphene nanoplatelets; Aluminum; Spark plasma sintering; Orowan strengthening mechanism; METAL-MATRIX NANOCOMPOSITES; CARBON NANOTUBES; BEHAVIOR; MICROSTRUCTURE; POLYETHYLENE; MODEL;

D O I：

10.1016/j.msea.2017.04.009

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Graphene nanoplatelets (GNP) reinforced aluminum matrix composites, with <= 5 wt% GNP content, were synthesized by spark plasma sintering (SPS). GNPs were found to withstand severe conditions of high pressure and temperature during processing. Strength of composite was observed to be depending on the content and uniform dispersion of GNP in aluminum matrix, as verified by scanning electron micrographs. X-ray diffraction analysis confirmed that no reaction products exist at Al-GNP interface in significant amount. Instrumented indentation studies revealed improvement in hardness by 21.4% with 1 wt% GNP. This is due to the presence of stronger reinforcement, which provides high resistance to matrix against deformation. Improvement in yield strength and tensile strength was 84.5% and 54.8%, respectively, with 1 wt% GNP reinforcement. Properties deteriorated at higher concentration due to agglomeration of GNP. Reinforcing effect of GNPs, in terms of strengthening of composite, is found to be dominated by Orowan strengthening mechanism. Pinning of grains boundaries by GNPs led to uniform grain size distribution in the composites structure. Overall, graphene reinforcement has offered 86% improvement in specific strength of aluminum matrix.

引用

页码：20 / 28

页数：9

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