Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering
Ti-6Al-4V alloy (TC4) with different concentrations of graphene nanoplatelets (GNPs) were fabricated by ball milling and spark plasma sintering (SPS). Microstructure characteristics of the composites were characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), and Raman. Microh...
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doaj-8047fc53ce184839878e70e16f963d2e2020-11-25T03:10:52ZengMDPI AGMetals2075-47012020-06-011073773710.3390/met10060737Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma SinteringWei Wang0Haixiong Zhou1Qingjuan Wang2Baojia Wei3Shewei Xin4Yuan Gao5School of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaTitanium Alloy Institute, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, ChinaSchool of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaTi-6Al-4V alloy (TC4) with different concentrations of graphene nanoplatelets (GNPs) were fabricated by ball milling and spark plasma sintering (SPS). Microstructure characteristics of the composites were characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), and Raman. Microhardness and the compressive mechanical properties were also investigated. Experimental results showed that in the process of SPS, most of the GNPs were still retained at high pressure and temperature, and a new phase of TiC was presented due to the in-situ reaction between TiC and GNPs. Also, the strength of the composites was depended on the concentration of GNPs in TC4 matrix. Consequently, the composite with 0.8 wt. % GNPs was increased 18% in microhardness. The maximum yield strength and ductility of the composite were increased by 22.2% and 43.2%, respectively. The strengthening mechanism of the composites was further discussed, and the Orowan strengthening mechanism was the main strengthening factor.https://www.mdpi.com/2075-4701/10/6/737graphene nanoplateletsmetal-matrix compositemicrostructuremechanical propertiesstrengthening mechanism |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wei Wang Haixiong Zhou Qingjuan Wang Baojia Wei Shewei Xin Yuan Gao |
spellingShingle |
Wei Wang Haixiong Zhou Qingjuan Wang Baojia Wei Shewei Xin Yuan Gao Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering Metals graphene nanoplatelets metal-matrix composite microstructure mechanical properties strengthening mechanism |
author_facet |
Wei Wang Haixiong Zhou Qingjuan Wang Baojia Wei Shewei Xin Yuan Gao |
author_sort |
Wei Wang |
title |
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering |
title_short |
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering |
title_full |
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering |
title_fullStr |
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering |
title_full_unstemmed |
Microstructural Evolution and Mechanical Properties of Graphene-Reinforced Ti-6Al-4V Composites Synthesized via Spark Plasma Sintering |
title_sort |
microstructural evolution and mechanical properties of graphene-reinforced ti-6al-4v composites synthesized via spark plasma sintering |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2020-06-01 |
description |
Ti-6Al-4V alloy (TC4) with different concentrations of graphene nanoplatelets (GNPs) were fabricated by ball milling and spark plasma sintering (SPS). Microstructure characteristics of the composites were characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), and Raman. Microhardness and the compressive mechanical properties were also investigated. Experimental results showed that in the process of SPS, most of the GNPs were still retained at high pressure and temperature, and a new phase of TiC was presented due to the in-situ reaction between TiC and GNPs. Also, the strength of the composites was depended on the concentration of GNPs in TC4 matrix. Consequently, the composite with 0.8 wt. % GNPs was increased 18% in microhardness. The maximum yield strength and ductility of the composite were increased by 22.2% and 43.2%, respectively. The strengthening mechanism of the composites was further discussed, and the Orowan strengthening mechanism was the main strengthening factor. |
topic |
graphene nanoplatelets metal-matrix composite microstructure mechanical properties strengthening mechanism |
url |
https://www.mdpi.com/2075-4701/10/6/737 |
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