Abstract
The recrystallization behaviour of W-3Re-2ThO 2 has been compared with undoped tungsten, both materials being produced by powder metallurgical methods. Specimens of different degrees of cold working were investigated by X-ray diffraction, hardness tests, metallographical and electron microscopical methods after annealing for one hour in the temperature range between 1000 ° and 2400 °C. The results show that the threshold of the alloy compared with tungsten is shifted to higher temperatures for about 100 ° to 400 °C, depending on the degree of cold working. The secondary recrystallization observed in tungsten does not occur in the alloy at the same temperatures. Primary recrystallization in tungsten seems to be a grain boundary migration after Beck for small degress of cold working. But, in the case of larger deformations, it is initiated by a nucleation process as proposed by Burgers and Cahn. Recrystallized grains in the alloy are extended in the rolling direction parallel to the strings of particles. The results are summarized in a recrystallization diagram for both materials. Loss of shape stability of the ThO 2 particles occurred after annealing for one hour at 2400 °C, and already at 2200 °C after longer annealing times. Nevertheless the effect of these particles on the recrystallization behaviour has been observed in all cases.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
