TY - JOUR
T1 - A new 1/1 crystal approximant to the stable Ti-Zr-Ni icosahedral quasicrystal
AU - Kim, W. J.
AU - Gibbons, P. C.
AU - Kelton, K. F.
PY - 1997/9
Y1 - 1997/9
N2 - We report here the discovery of a new bcc 1/1 crystal approximant (W-phase) to the stable icosahedral quasicrystal (i-phase) discovered recently in Ti-Zr-Ni alloys. As-cast Ti-Zr-Ni ingots, which originally contain only the C14 Laves and the hcp solid-solution phases, transform almost completely to the i-phase after annealing at 570°C for 64h. Anneals at higher temperature (610°C) lead to the formation of the bcc W-phase, with a0 = 1.432 nm. Preliminary X-ray diffraction studies indicate that the structure of the W-phase is similar to that of the Al-Mg-Zn Bergman phase, or the isostructural Al-Li-Cu R-phase, supporting a previous proposal that i-(Ti-Zr-Ni) is structurally different from i-(Ti-Cr-Si-O) or i-(Ti-Mn-Si-O), but similar to i-(Al-Li-Cu) or i-(Al-Mg-Zn).
AB - We report here the discovery of a new bcc 1/1 crystal approximant (W-phase) to the stable icosahedral quasicrystal (i-phase) discovered recently in Ti-Zr-Ni alloys. As-cast Ti-Zr-Ni ingots, which originally contain only the C14 Laves and the hcp solid-solution phases, transform almost completely to the i-phase after annealing at 570°C for 64h. Anneals at higher temperature (610°C) lead to the formation of the bcc W-phase, with a0 = 1.432 nm. Preliminary X-ray diffraction studies indicate that the structure of the W-phase is similar to that of the Al-Mg-Zn Bergman phase, or the isostructural Al-Li-Cu R-phase, supporting a previous proposal that i-(Ti-Zr-Ni) is structurally different from i-(Ti-Cr-Si-O) or i-(Ti-Mn-Si-O), but similar to i-(Al-Li-Cu) or i-(Al-Mg-Zn).
UR - http://www.scopus.com/inward/record.url?scp=0031235934&partnerID=8YFLogxK
U2 - 10.1080/095008397179165
DO - 10.1080/095008397179165
M3 - Article
AN - SCOPUS:0031235934
SN - 0950-0839
VL - 76
SP - 199
EP - 205
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
IS - 3
ER -