Electron Microscopy Study of Eutectic Structure in Nb-Ti-X and Nb-Zr-X (X = Co, Ni) Hydrogen Permeation Alloys
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The morphology and crystallography of eutectic structures in several niobium-bearing hydrogen permeation alloys such as Nb<SUB>20</SUB>Ti<SUB>40</SUB>Ni<SUB>40</SUB>, Nb<SUB>30</SUB>Ti<SUB>35</SUB>Co<SUB>35</SUB>, Nb<SUB>13</SUB>Zr<SUB>43</SUB>Ni<SUB>44</SUB>, and Nb<SUB>25</SUB>Zr<SUB>35</SUB>Co<SUB>40</SUB> have been investigated by means of transmission electron microscopy. The alloys Nb<SUB>20</SUB>Ti<SUB>40</SUB>Ni<SUB>40</SUB>, Nb<SUB>30</SUB>Ti<SUB>35</SUB>Co<SUB>35</SUB>, and Nb<SUB>25</SUB>Zr<SUB>35</SUB>Co<SUB>40</SUB> possess eutectic structures consisting of fine lamellar morphology with Nb-based bcc and B2 intermetallic phases. The Nb<SUB>13</SUB>Zr<SUB>43</SUB>Ni<SUB>44</SUB> 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<SUB>20</SUB>Ti<SUB>40</SUB>Ni<SUB>40</SUB> and the Nb<SUB>25</SUB>Zr<SUB>35</SUB>Co<SUB>40</SUB> alloys exhibit a cube-on-cube orientation relationship between the bcc and B2 phases. The eutectic structure in the Nb<SUB>13</SUB>Zr<SUB>43</SUB>Ni<SUB>44</SUB> 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<SUB>30</SUB>Ti<SUB>35</SUB>Co<SUB>35</SUB> alloy, as follows: (110)<SUB>(Nb, Ti)</SUB>||(110)<SUB>TiCo</SUB>, [\\bar221]<SUB>(Nb, Ti)</SUB>||[001]<SUB>TiCo</SUB>. The atomic arrangements at the eutectic interface are also discussed on the basis of high-resolution observations.
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