Abstract
In this study, a new medium-heavy alloy (MHA) of 55Ni-39 W-5Co-1Ta was designed, based on the principles of face-centered cubic structures and age-strengthening. The microstructure and properties of pre-deformed MHA after aging were systematically explored by room-temperature tensile testing, scanning electron microscopy, transmission electron microscopy and x-ray diffraction. Results show that a large number of dislocations were generated in the solid solution of the MHA by pre-deformation, and the dislocation density increased significantly with deformation. The high-density dislocations interacted with each other and formed dislocation tangles, then the dislocation cells. Moreover, pre-deformation effectively promoted the precipitation of the Ni4W phase during the subsequent aging, and the volume fraction of the Ni4W phase increased significantly under increased pre-deformation. Thanks to a combined effect of work-hardening and age-strengthening, the tensile and yield strengths of the pre-deformed MHA after the aging treatment increased significantly. The fracture morphology of the pre-deformed MHA after the aging treatment showed typical ductile fracture characteristics. The novel MHA has better dynamic performance, and the flow stress of the MHA was effectively improved by the aging treatment.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China [Grant Numbers U1804146 and 52111530068]; the program for science, Technology Innovation Talents in Universities of Henan Province [Grant Number 17HASTIT026]; the Science and Technology Innovation Team of Henan University of Science and Technology [Grant Number 2015XTD006]; the Foreign Experts Introduction Project of Henan Province [Grant Number HNGD2020009].
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Li, Y., Xiong, Y., Ma, Yf. et al. Effect of Aging Treatment on the Microstructure and Properties of a Novel Medium-Heavy NiWCoTa Alloy Subjected to Pre-deformation. J. of Materi Eng and Perform 32, 8314–8324 (2023). https://doi.org/10.1007/s11665-022-07729-w
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DOI: https://doi.org/10.1007/s11665-022-07729-w