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Strength and Toughness of Be12Nb, Be17 Nb2 and Two-Phase Be12Nb-Be17Nb2

Published online by Cambridge University Press:  15 February 2011

Stephen M. Bruemmer
Affiliation:
Pacific Northwest Laboratory, Richland, WA
Bruce W. Arey
Affiliation:
Pacific Northwest Laboratory, Richland, WA
Charles H. Henager Jr.
Affiliation:
Pacific Northwest Laboratory, Richland, WA
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Abstract

Bend strength, compression strength, and fracture toughness of niobium beryllide intermetallic compounds have been assessed at temperatures from ambient to 1200°C. Hot-isostatically-pressed (HIP) Be12Nb showed significantly improved lowand high-temperature mechanical properties over vacuum-hot-pressed (VHP) material. Strengths at 20°C were 250 MPa in bending and 2750 MPa in compression with a fracture toughness of ∼4 Mpa√m, much higher than previously measured for this compound. High-temperature (≥ 1000°C) mechanical properties were also improved with bend strengths of 250 MPa at 1200°C as compared to only 70 to 100 MPa for the VHP material. However, severe pest embrittlement was detected in the HIP material at temperatures between 650 and 1000°C.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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Strength and Toughness of Be12Nb, Be17 Nb2 and Two-Phase Be12Nb-Be17Nb2
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Strength and Toughness of Be12Nb, Be17 Nb2 and Two-Phase Be12Nb-Be17Nb2
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