Texture evolution of tungsten materials during recrystallization

Abstract

Some functional and structural performance of tungsten (W) are related to its texture characteristics. Usually, W serves in high temperature and may undergo recrystallization. Thus it's necessary to evaluate the recrystallization texture of W. In our previous studies, pure W (PW) and W-1.0wt%La 2 O 3 (WL10) were deformed via unidirectional rolling (UNR), cross rolling (CRR) and clock rolling (CLR) with 80% reduction. In the present paper, PW-UNR, PW-CRR, PW-CLR and WL10-UNR were subjected to annealing at 2073 K for 2 h to achieve recrystallization and figure out the evolution mechanism of recrystallization texture in W materials. Besides, the effect of La 2 O 3 on recrystallization texture of W was discussed. The results indicated that the fiber textures in rolling state were transformed into isolated textures after recrystallization. {001}〈uvw〉 isolated texture formed in the recrystallized W may be mainly resulted from the texture inheritance. {113}〈361〉 isolated texture formed in the recrystallized WL10-UNR may be attributed to the orientated growth of {113}〈361〉 grains with high grain boundary mobility facilitated by La 2 O 3 . Generally, isolated textures near θ-fiber were strengthened while γ-fiber was weakened for W during recrystallization, which is an effective method to achieve W with more {001} and less {111} textures.

Archives of Metallurgy and Materials

“…on the other hand, in the microstructure of the composite powders, some cube-shaped particles are observed as indicated by arrows. in general, W powder has a tendency being cube shape as the degree of oxidation increases [8,9]. Thus, it is interpreted that the formation of these particles is due to the formation of some oxides during the synthesis process of the composite powder.…”