Unveiling the influence of the high-pressure torsion (HPT) on microstructure for pure tungsten under annealing process is of great significance to realize the control of thermal stability and irradiation resistance at high temperatures. To this end, a detailed investigation on the microstructure evolution, energy release and its hardness change is conducted. The results show that the microstructure with homogeneous fine grains and the favorable orientation with high irradiation resistance appeared after the continuous static recrystallization (cSRX). During the HPT and subsequent annealing process, the stored energy change is mainly affected by high angle grain boundaries (HAGBs). Although the ultrahigh stored energy released in the annealing process, the homogeneous fine grains and the boundaries with high average misorientation lead to the stable grain growth with the low boundary velocity even at high temperatures and then improve the irradiation resistance of tungsten. And the high hardness retention is also presented at 1350 °C. Results reveal that, performing HPT makes it possible to improve the thermal stability and irradiation resistance in pure tungsten.

揭示退火过程中高压扭转对纯钨显微组织的影响，对于控制高温下的热稳定性和耐辐照性具有重要意义。为此，进行了微观组织演变，能量释放及其硬度变化的详细研究。结果表明，连续静态再结晶（cSRX）后，出现了晶粒均匀且具有良好的取向性和较高的耐辐照性的组织。在HPT和随后的退火过程中，存储的能量变化主要受高角度晶界（HAGB）的影响。尽管退火过程中释放了超高存储能量，均匀的细晶粒和平均取向差高的晶界即使在高温下也能以较低的晶界速度实现稳定的晶粒长大，从而提高了钨的耐辐照性。在1350°C时也具有很高的硬度保持率。结果表明，进行HPT可以提高纯钨的热稳定性和耐辐照性。