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Effect of niobium on the microstructure, hydrogen embrittlement, and hydrogen permeability of NbxHf(1−x)/2Ni(1−x)/2 ternary alloys

✍ Scribed by Feng Shi; Xiping Song

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
821 KB
Volume
35
Category
Article
ISSN
0360-3199

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✦ Synopsis

The influence of niobium (Nb) on the microstructure, hydrogen embrittlement, and hydrogen permeability of the Nb x Hf (1Àx)/2 Ni (1Àx)/2 ternary alloys has been studied in particular. The results show that the quantity of the primary (Nb, Hf) phase decreases with the increase of Nb content from 14 mol% to 16 mol%, and then increases with the increase of the Nb content from 16 mol% to 40 mol%. The Nb 14 Hf 43 Ni 43 alloy is brittle at all temperatures from 523 K to 673 K, as it possesses the largest amount of the B f -HfNi compound; however, the Nb 40 Hf 30 Ni 30 alloy has high resistance to hydrogen embrittlement at all temperatures from 523 K to 673 K, as it possesses the largest amount of the primary (Nb, Hf) phase. The hydrogen permeability (F) increases with the increase in Nb content, as the quantity of the primary (Nb, Hf) phase in the Nb x Hf (1Àx)/2 Ni (1Àx)/2 ternary alloys also increases with the increase in Nb content.

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