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Hot Extrusion of Carbon Nanotube - Magnesium Matrix Composite Wire

Dongare, Vishal S.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1415975904

Abstract Details

2014, Master of Science (MS), Ohio University, Mechanical Engineering (Engineering and Technology).
The main goal of this research was to develop a lab-based process to produce a carbon nanotube (CNT)-Mg matrix composite wire via hot extrusion. An apparatus was developed for use with a 250 kN servo hydraulic MTS® machine to perform hot extrusion in this research. The CNT-Mg billets with 3 wt.% CNTs were provided by external researchers. The scope of the project involved modeling the process analytically and performing a series of extrusion trials to determine flow properties of the composite material. Material parameters for the classical Zener-Hollomon model was determined using compression testing to characterize the plastic behavior of pure Mg as a function of temperature and strain rate. To show consistency with the Zener-Hollomon model, three extrusion trials with pure Mg were conducted. Extrusion trials were also performed on the CNT-Mg composite material. To produce a refined composite structure of CNTs in the Mg matrix, re-extrusion trials were performed with re-pressed CNT-Mg composite billets. These new billets were produced from the extruded wire obtained in the previous extrusion. The effect of CNT addition on Mg and the effect of re-extrusions on the composites' flow properties were assessed. The addition of CNTs increased the apparent flow stress of Mg by 10 – 30%. The apparent flow stress of the composite was further increased by 50 – 70% as a result of repressing and re-extrusion, compared to pure Mg.
Frank Kraft, Ph.D. (Advisor)
87 p.
Materials Science; Mechanical Engineering
extrusion; carbon nanotube; magnesium; zener hollomon; extrusion die; compression; ring compression; flow stress; metal composite; material model; plasticity

Recommended Citations

Citations

  • Dongare, V. S. (2014). Hot Extrusion of Carbon Nanotube - Magnesium Matrix Composite Wire [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1415975904

    APA Style (7th edition)

  • Dongare, Vishal. Hot Extrusion of Carbon Nanotube - Magnesium Matrix Composite Wire. 2014. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1415975904.

    MLA Style (8th edition)

  • Dongare, Vishal. "Hot Extrusion of Carbon Nanotube - Magnesium Matrix Composite Wire." Master's thesis, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1415975904

    Chicago Manual of Style (17th edition)

ohiou1415975904
526
© 2014, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.