|About this Abstract
||Materials Science & Technology 2020
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Hot Isostatic Pressing of Niobium-based Refractory Alloy Powders
||Calvin Mikler, Brian Welk, Benjamin Georgin, Todd Butler, Noah Philips, Hamish L Fraser
|On-Site Speaker (Planned)
Niobium-based WC-3009 (Nb-30Hf-9W wt%) is a single-phase bcc refractory alloy designed as a candidate replacement for the still commonly utilized C-103 (Nb-10Hf-1Ti wt%) alloy. While WC-3009 exhibits superior high-temperature mechanical properties compared with C-103, fabrication is economically prohibitive, and the alloy was not employed in any capacity. In this study, pre-alloyed HDH WC-3009 and PREP C-103 powders were canned and subsequently consolidated via hot isostatic pressing (HIP). This effort was performed to identify key alloy attributes that drive processability through HIP such that higher strength Nb-based refractory alloys can be utilized. Backscattered electron (BSE) imaging and electron backscattered diffraction (EBSD) analysis revealed the degree of recrystallization and recovery substructure formation. Transmission electron microscopy (TEM) coupled with x-ray energy dispersive spectroscopy (XEDS) were employed to analyze second phase precipitation behavior and dislocation substructures. The results indicated that hot isostatic pressing is a viable method of processing high performance Nb-based refractory alloys.