The microstructure and microhardness of W–5wt% Cr alloy fabricated by spark plasma sintering

•The 98.5% relative density W–5wt% Cr alloy was fabricated by SPS method.•The Vickers hardness of the annealed samples can reach 760Hv.•Obtained nano-scaled microstructure may be beneficial for irradiation resistance of W-based alloy. The W–5wt% Cr alloy with a relative density of 98.5% was fabricat...

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Veröffentlicht in:Journal of alloys and compounds 2014-02, Vol.585, p.771-775
Hauptverfasser: Zhou, Y., Sun, Q.X., Xie, Z.M., Liu, R., Wang, X.P., Fang, Q.F., Liu, C.S.
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Sprache:eng
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Zusammenfassung:•The 98.5% relative density W–5wt% Cr alloy was fabricated by SPS method.•The Vickers hardness of the annealed samples can reach 760Hv.•Obtained nano-scaled microstructure may be beneficial for irradiation resistance of W-based alloy. The W–5wt% Cr alloy with a relative density of 98.5% was fabricated by the spark plasma sintering at 1700°C, subsequently solid solution treated at 500, 800 and 1100°C for varying times, and then quenched to room temperature. The microstructure and Vickers microhardness were characterized. It was found that after solid solution the grain size increased from 2 to 3.8μm. The samples annealed at 800°C for 30–960min exhibit stable nano-scaled microstructure, that is, the Cr-rich phases in a size of about 100–200nm precipitated in the W grains by Spinodal decomposition, and the W sub-grains in a size of 40–50nm separated by the nano-scaled Cr-rich phases. The Vickers microhardness of such samples can reach 760Hv.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.10.010