NEW STACKING VARIANT OF LAVES PHASE FOUND IN (TI0.95V0.05) CO-2 ALLOY

Microstructures of the Laves phase alloy, (Ti0.95V0.05) Co-2, were stu died by high resolution electron microscopy and electron diffraction. In this allay system, coexistence of several kinds of layered structur es was observed. Among these structures, a new stacking variant was fo und and was analyzed to be ABCAB'A'C'BCA'C'B'. This structure belongs to the trigonal system of the space group <P(3)over bar>m1 (no. 164). The lattice parameters presented in the hexagonal system are a = 0.472 7 +/- 0.0009 nm and c = 4.628 +/- 0.008 nm. This structure is called 1 2T in the Ramsdell notation and 4323 in the Zhdanov symbol, and is cla ssified into hP(3) over bar m1-(6i)(5)(3f)(3e)(2d)(12)(2c)(6) using th e Wyckoff notation. (C) 1998 Wiley-Liss, Inc.