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L-J phase in a Cu2.2Mn0.8Al alloy

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Abstract

A new type of precipitate (designated L-J phase) with two variants was observed within the (DO3 + L21) matrix in a Cu2.2Mn0.8Al alloy. Transmission electron microscopy examinations indicated that the L-J phase has an orthorhombic structure with lattice parametersa = 0.413 nm,b = 0.254 nm andc = 0.728 nm. The orientation relationship between the L-J phase and the matrix is (100)L-J//(011) m , (010)L-J//(111) m and (001)L-J//(211) m . The rotation axis and rotation angle between two variants of the L-J phase are [021] and 90 deg. The L-J phase has never been observed in various Cu-Al, Cu-Mn, and Cu-Al-Mn alloy systems before.

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Authors and Affiliations

  1. Institute of Mechanical Engineering, National Chiao Tung University, Taiwan, Republic of China

    S. C. Jeng (Graduate Student)

  2. Institute of Materials Science and Engineering, National Chiao Tung University, Taiwan, Republic of China

    T. F. Liu (Professor and Chairman)

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  1. S. C. Jeng
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  2. T. F. Liu
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Jeng, S.C., Liu, T.F. L-J phase in a Cu2.2Mn0.8Al alloy. Metall Mater Trans A 26, 1353–1365 (1995). https://doi.org/10.1007/BF02647586

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  • DOI: https://doi.org/10.1007/BF02647586

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