Preparation of Nb-Cr Alloy Powder by Hydrogenation
Preparation of Nb-Cr Alloy Powder by Hydrogenation
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加氢法制备铌铬合金粉末
DOI：
10.2320/jinstmet1952.62.7_681
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发表时间：
1998
影响因子：
--
通讯作者：
S. Hanada
中科院分区：
文献类型：
--
作者：
M. Kosuge;H. Hosoda;S. Hanada
The pulverization by hydrogenation is a new method for fa’bricating intermetallic powders with high quality and low cost． In this study， the pulverization by hydrogenation was studied for various Nb−Cr alloys． The hydrogenation was performed under the hydrogen atmosphere of O．1 MPa in an arc−melting chamber without exposure to air after arc−melting． Constituent phases and lattice constants before and after hydrogenation were examined by X−ray diffraction analysis． It is found that the pulverization by hydrogenation occurs only in two phase a皿oys consisting of Nb solid solution（Nbss）and NbCr2． In the Nbss／NbCr2 alloys， the lattice constant of Nbs， increases remarkably through hydrogenation， while that of NbCr2 does not change． It is concluded that the pulverization of the Nbss／NbCr2 two phase alloy is caused by large strain accompanied with lattice expansion of Nbs， through hydrogenation and crack nucleation at intrinsically brittle NbCr2．