Electron Microscopy Study of Eutectic Structure in Nb-Ti-X and Nb-Zr-X (X = Co, Ni) Hydrogen Permeation Alloys
Electron Microscopy Study of Eutectic Structure in Nb-Ti-X and Nb-Zr-X (X = Co, Ni) Hydrogen Permeation Alloys
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DOI：
10.2320/matertrans.ma200803
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发表时间：
2008-10
影响因子：
1.2
通讯作者：
M. Matsuda;T. Murasaki;M. Nishida;K. Ishikawa;K. Aoki
中科院分区：
文献类型：
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作者：
M. Matsuda;T. Murasaki;M. Nishida;K. Ishikawa;K. Aoki
用透射电镜研究了几种含铌渗氢合金Nb 20 Ti40 Ni 40、Nb 30 Ti 35 Co 35、Nb 13 Zr 43 Ni 44和Nb 25 Zr 35 Co 40的共晶组织的形貌和晶体学。Nb 20 Ti40 Ni 40、Nb 30 Ti 35 Co 35和Nb 25 Zr 35 Co 40合金具有由Nb基bcc和B2金属间化合物相组成的细片层结构的共晶组织。Nb 13 Zr 43 Ni 44合金具有由棒状bcc-（Nb，Zr）相和由B2高温相置换转变而来的B33-ZrNi相组成的共晶组织。Nb 20 Ti40 Ni 40和Nb 25 Zr 35 Co 40合金中的共晶组织在bcc和B2相之间表现出立方对立方的取向关系。Nb 13 Zr 43 Ni 44合金中的共晶结构也表现出立方对立方的取向关系，考虑到B2和B33结构之间的晶格对应。而在Nb 30 Ti 35 Co 35合金中发现了一种独特的取向关系：（110）（Nb，Ti）//（110）TiCo，[221]（Nb，Ti）// [001] TiCo。在高分辨率观测的基础上，共晶界面处的原子排列也进行了讨论。
The morphology and crystallography of eutectic structures in several niobium-bearing hydrogen permeation alloys such as Nb 20 Ti 40 Ni 40 , Nb 30 Ti 35 Co 35 , Nb 13 Zr 43 Ni 44 , and Nb 25 Zr 35 Co 40 have been investigated by means of transmission electron microscopy. The alloys Nb 20 Ti 40 Ni 40 , Nb 30 Ti 35 Co 35 , and Nb 25 Zr 35 Co 40 possess eutectic structures consisting of fine lamellar morphology with Nb-based bcc and B2 intermetallic phases. The Nb 13 Zr 43 Ni 44 alloy possesses a eutectic structure consisting of rod-shaped bcc-(Nb, Zr) phase and B33-ZrNi phase which displacively transforms from the B2 high-temperature phase. The eutectic structures in the Nb 20 Ti 40 Ni 40 and the Nb 25 Zr 35 Co 40 alloys exhibit a cube-on-cube orientation relationship between the bcc and B2 phases. The eutectic structure in the Nb 13 Zr 43 Ni 44 alloy also exhibits a cube-on-cube orientation relationship by considering the lattice correspondence between the B2 and the B33 structures. On the other hand, a unique orientation relationship is found out in the Nb 30 Ti 35 Co 35 alloy, as follows: (110) (Nb, Ti) // (110) TiCo , [221] (Nb, Ti ) // [001] TiCo . The atomic arrangements at the eutectic interface are also discussed on the basis of high-resolution observations.