Microstructure and texture evolution in warm-rolled fine-grained tungsten

Abstract

Fine-grained tungsten was prepared by sintering nano‑tungsten powder and its properties was further improved by warm rolling in the paper. And the microstructure and texture evolution of fine-grained tungsten under different rolling reduction was mainly investigated. Detailed microstructure characterizations under different rolling reduction stages showed a large number of sub-grain structures appeared in the fine-grained rolling tungsten grains, which increases the grain boundary area. Quantitative texture analysis showed that the rolled fine-grained tungsten had a typical BCC texture, the overall texture strength was enhanced after 50% RR and the texture intensity of grains larger than the average grain size was stronger than that of the whole grains, especially in the center of {111} pole figure. Warm rolling of fine-grained tungsten strongly affects the mechanical properties of tungsten, such insights in warm-rolled tungsten are valuable for an understanding of their performance as potential plasma-facing materials in future fusion reactors.