Abstract
In this paper, pure W, W-0.8wt % (HfNbMoZrTi)B2 and W-1.0wt % (HfNbMoZrTi)B2 (abbreviated as W-0.8HEB and W-1.0HEB, respectively) materials were fabricated using mechanical ball milling and spark plasma sintering. The effects of HEB addition on the microstructure, mechanical properties, and thermal conductivity were studied. The W-0.8HEB materials demonstrated a high hardness of approximately 506 Hv and a high yield strength of 1774 MPa, surpassing those of pure W and W-1.0HEB. Additionally, the recrystallization temperature of W-0.8HEB reached up to 1800 °C, higher than that of most reported W materials. HRTEM results revealed highly stable, nanosized, brookite-structured (HfNbMoZrTi)O2 particles formed by an in-situ reaction between (HfNbMoZrTi)B2 and O impurities during high-temperature sintering. This reaction diminishes the interstitial O concentration in W, resulting in enhanced mechanical properties and thermal stability.
Published Version
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