عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
NATIONAL BIBLIOGRAPHY NUMBER
Number
TL53311
LANGUAGE OF THE ITEM
.Language of Text, Soundtrack etc
انگلیسی
TITLE AND STATEMENT OF RESPONSIBILITY
Title Proper
Atomic-Scale Modeling of Twinning in Titanium and Other HCP Alloys
General Material Designation
[Thesis]
First Statement of Responsibility
Hooshmand, Mohammad Shahriar
Subsequent Statement of Responsibility
Ghazisaeidi , Maryam
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
The Ohio State University
Date of Publication, Distribution, etc.
2019
GENERAL NOTES
Text of Note
167 p.
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
Ph.D.
Body granting the degree
The Ohio State University
Text preceding or following the note
2019
SUMMARY OR ABSTRACT
Text of Note
Titanium (Ti) and its alloys have a wide range of applications in biomedical, automotive and aerospace industries due to their excellent strength to weight ratio and corrosion resistance. Alpha phase Ti has hexagonal closed packed (hcp) structure that shows anisotropic plastic deformation; ⟨ a ⟩ type slip on prism planes is the easiest to activate but cannot accommodate deformation along the ⟨ c ⟩ axis. The low temperature ductility of Ti is linked to twinning. Therefore, understanding the mechanisms behind the twin nucleation and growth in Ti alloys is important from both theoretical and industrial application points of view. To that end, the present study seeks a better understanding of the atomic scale processes involved in twin nucleation mechanisms and the effect of alpha-stabilizing solutes such as interstitial oxygen, substitutional aluminum and rare earth elements on twinning. Systematic molecular dynamics (MD) simulations are used to identify the underlying mechanism of twin nucleation from dislocation/grain boundary interactions. Density functional theory (DFT) simulations are employed to examine the effect of oxygen interstitials on the twinning behavior of Ti. A systematic framework has been developed to predict the diffusion of interstitial elements near the twin boundaries in hcp alloys. Next, uncertainty that arises from first-principles calculations in predicting diffusion coefficients are quantified. Finally, solute segregation to the twin boundaries as a new mechanism for dynamic strain aging (DSA) is investigated in Ti and other hcp alloys.
UNCONTROLLED SUBJECT TERMS
Subject Term
Computer science
Subject Term
Materials science
PERSONAL NAME - PRIMARY RESPONSIBILITY
Hooshmand, Mohammad Shahriar
PERSONAL NAME - SECONDARY RESPONSIBILITY
Ghazisaeidi , Maryam
CORPORATE BODY NAME - SECONDARY RESPONSIBILITY
The Ohio State University
ELECTRONIC LOCATION AND ACCESS
Electronic name
مطالعه متن کتاب p
[Thesis]
276903
a
Y
