Estimation of Dislocation Density in Cold-Rolled Commercially Pure Titanium by Using Synchrotron Diffraction
- PDF / 1,434,018 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 77 Downloads / 218 Views
INTRODUCTION
COLD rolling (CR) is the fundamental phenomena of microstructure evolution in the processing of engineering materials. It is of major scientific interest and of great importance for a wide range of industrial applications. Deformation by cold rolling is a process by which the metal is introduced between rollers and then is compressed and squeezed at room temperature to reduce its cross-sectional area.[1–4] It is convenient to express the degree of plastic deformation as percent cold work as follows:
predict features of the materials and to design materials with certain properties, a fundamental understanding of the deformation process in terms of microstructural parameters is critical.[5] These properties are highly dependent on the materials microstructure. This article aims to study the effects of cold rolling (at 40 pct, 60 pct, and 80 pct) on the dislocation density in a hexagonal crystal structured commercially pure titanium (cp-Ti) (grade 1) by using synchrotron peak profile analysis. Furthermore, the effects of the induced dislocation densities on the fatigue performance of the coldrolled cp-Ti were investigated.
pct cold rolled ¼ ½ðA0 Ad Þ=A0 100 where A0 is the original area of the cross section and Ad is the cross-sectional area after deformation. Titanium and titanium alloys are used in a wide variety of aerospace, energy, and biomedical applications because they have very attractive properties, such as high specific strength, elastic modulus, and fracture toughness. These properties are highly dependent on the materials microstructure, i.e., texture, dislocation density, dislocation slip, and system activity. Therefore, to
HASAN ALKHAZRAJI, MOHAMMED Z. SALIH, and ZHENGYE ZHONG, Ph.D. Students, LOTHAR WAGNER, Director, and MANSOUR MHAEDE, Dr.-Ing, are with the Institute of Materials Science and Engineering, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany. Contact e-mail: hasan.al-khazraji@ tu-clausthal.de HANS-GU¨NTER BROKMEIER, Professor, is with the Institute of Materials Science and Engineering, Clausthal University of Technology, and with the Institute of Materials Research, Helmholtz Zentrum Geesthacht (HZG), Max-Planckstr.1, 21502 Geesthacht, Germany. N. SCHELL, Scientist, is with the Institute of Materials Research, Helmholtz Zentrum Geesthacht (HZG). Manuscript submitted November 26, 2013. METALLURGICAL AND MATERIALS TRANSACTIONS B
A. Synchrotron Peak Profile Analysis and Burgers Vector Populations Synchrotron beam is the electromagnetic radiation emitted when electrocharged particles, usually electrons or positron in storage ring, moving at velocities close to the speed of light, are forced to change direction by magnetic field. The synchrotron radiation is emitted in a narrow cone, at a tangent to the particles’ orbit. A great potential of synchrotron radiation for materials science is based on high spatial resolution with excellent brilliance and high penetration depth through materials in the same order as with thermal neutrons. The high spatial resolut
Data Loading...
