Atomic-Scale Modeling of Twinning in Titanium and Other HCP Alloys
نام عام مواد
[Thesis]
نام نخستين پديدآور
Hooshmand, Mohammad Shahriar
نام ساير پديدآوران
Ghazisaeidi , Maryam
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
The Ohio State University
تاریخ نشرو بخش و غیره
2019
مشخصات ظاهری
نام خاص و کميت اثر
167
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
The Ohio State University
امتياز متن
2019
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
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.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Computer science
موضوع مستند نشده
Materials science
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )