Transformation Matrices for Determination of γ/γ Interface Types in Two-Phase TiAl Alloys

Acta Metall Sin

2004, Vol. 40

Issue (9): 903-908 DOI:

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Transformation Matrices for Determination of γ/γ Interface Types in Two-Phase TiAl Alloys

CHEN Shanhua; G. Schumacher

College of Materials and Bioengineering; Chengdu University of Technology; Chengdu 610059;Structure and Dynamics of Solids; Hahn--Meitner-Institut Berlin GmbH; 14109 Berlin; Germany

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CHEN Shanhua; G. Schumacher. Transformation Matrices for Determination of γ/γ Interface Types in Two-Phase TiAl Alloys. Acta Metall Sin, 2004, 40(9): 903-908 .

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Abstract The γ/γ lamellar interfaces play a critical role in the mechanical properties of γ+α2 two-phase TiAl-based alloys. The transformation matrices necessary for indexing the crystallographical orientations of γ lamella are systematically calculated. Based on these calculated matrices, the interface types between neighboring γ laths could be determined unambiguously. The frequency of different interface types in a Ti-47Al-2Mn-2Nb (atomic fraction, %)+0.8TiB2(volume fraction, %) alloy was measured by means of convergent-beam electron diffraction and compared with the frequency distribution in binary TiAl alloys.

Key words: TiAl-based alloy transformation matrix γ/γ interface

Received: 15 August 2003

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TG146.2

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I9/903

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