日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 8 (1965),
pp. 751-756

On the Martensite Transformations in Cu-Al-Mn Ternary Alloys

Shigeaki Sugino1, Norihiko Nakanishi2 and Hiroyasu Mitani3

1Department of Metallurgy, Faculty of Engineering, University of Osaka Prefecture, Osaka
2Department of Chemistry, Faculty of Science, Kyoto University, Kyoto
3Department of Metallurgy, Faculty of Engineering, Osaka University, Osaka

Abstract:

Effects of the Mn addition on the phase transformations of β Cu-Al alloys were studied by means of specific heat measurements and X-ray investigations. It was found that two types of martensite, β' and γ', were formed in Cu-11.8%Al-4%Mn alloy. Only β' martensite is observed in a quenched specimen, and both β' and γ' martensites are formed in a slowly cooled specimen. In the course of cooling the β phase, the occurrence of an ordering transformation, β → β1, resulted in an alteration in the concentration of the β phase. It is thought that the β' martensite is formed in the Al-poor β phase and the γ' in the Al-rich region. Several structures were supposed for the β1 phase which appeared in Cu-Al-Mn alloys.
The crystal structure of the γ' martensite formed in an alloy containing 12.5%Al and 4%Mn was determined to be orthorhombic with lattice parameters of a=4.45 Å, b=5.30 Å and c=4.24 Å.


(Received 1964/12/24)

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