Microscopic Properties of Long-Period Ordering in Al-Rich TiAl Alloys期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Microscopic Properties of Long-Period Ordering in Al-Rich TiAl Alloys

Authors:

S Hata T Nakano N Kuwano M Itakura S Matsumura Y Umakoshi

Affiliation:

(1) Department of Engineering Sciences for Electronics and Materials, Kyushu University, Kasuga 816-8580, Japan;(2) Course of Materials Science & Engineering, Division of Materials & Manufacturing Science, Osaka University, Suita 565-0871, Japan;(3) Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580, Japan;(4) Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan

Abstract:

The ordering mechanism of long-period superstructures (LPSs) in Al-rich TiAl alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L1₀-TiAl matrix: square Ti₄Al, fat rhombus Ti₃Al, and lean rhombus Ti₂Al type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the ${\left\langle {{\text{1,1/2,0}}} \right\rangle }$ * special-point ordering alloys such as Ni-Mo. This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred December 15–16, 2006 in Mumbai, India.

S. Hata (Associate Professor)Email:

Keywords:

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