Evolutions of the texture and microstructure of a heavily cold-rolled Ni9W alloy during recrystallization
- PDF / 620,066 Bytes
- 7 Pages / 584.957 x 782.986 pts Page_size
- 117 Downloads / 227 Views
Yi Wang, Lin Ma, Min Liu, and Hongli Suoa) College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China (Received 21 January 2016; accepted 4 April 2016)
Texture and microstructure evolution during recrystallization of a heavily cold-rolled Ni9W alloy were investigated using x-ray diffraction and electron back-scattered diffraction. Brass, S and random orientations dominated the recrystallization process because the fractions of cube, Copper, and Goss orientations were low. Nearly all of the Brass and a part of the S orientation were consumed during recrystallization. Some of the S orientation was recrystallized grains, which grew during annealing and remained after the primary recrystallization. A large number of grains with other random orientations were formed as they had a significant size and fraction advantage during recrystallization. The evolution of microstructure and texture during recrystallization demonstrated that the cube grains did not have a size advantage compared with the noncube grains, which lead to the formation of a rough recrystallization cube texture in the Ni9W alloy after annealing.
I. INTRODUCTION
Ni–W alloys are a promising substrate material for YBa2Cu3O7-d (YBCO) -coated conductors using a rolling-assisted biaxially textured substrate (RABiTS) process.1–5 The Ni5W alloy has been widely used as a substrate for YBCO-coated conductors and the formation of cube {001}h100i texture has been investigated systematically.6,7 The primary drawback of this material is its relatively high Curie temperature of approximately 330 K.8 Compared with the Ni5W alloy, the Ni9W alloy has superior mechanical properties and suppressed ferromagnetism. Ni9W would be an ideal substrate if the strong cube texture could be obtained.9–12 The formation of a strong cube texture is related to deformation and recrystallization textures. The classical Copper-type rolling texture is obtained in heavily deformed face-centered cubic (FCC) metals with large stacking fault energies (SFEs) and a Brass-type rolling texture can be obtained in heavily deformed FCC metals with relatively low SFEs.13–15 The main components in both Copper- and Brass-type rolling textures are the S {123}h634i, Brass {110}h112i, Copper {112}h111i and Goss {110}h001i orientations, and the rolling texture depends on the volume fraction of each rolling texture component, especially the Brass orientation.15,16 As a material with a relatively high SFE, the deformation texture of the Ni5W alloy has a typical Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.168
Copper-type rolling texture, which forms a strong cube texture after recrystallization. The Ni9W alloy has a typical Brass-type rolling texture, and does not easily form a strong cube texture after annealing.7,9,13–16 The cube texture formation depends on recrystallization and cube grain growth, and the fraction of the cube texture after hightemperature annealing is strongl
Data Loading...
