Masaharu Yamaguchi and Haruyuki Inui(Department of Metal Science and Technology
,
Kyoto University
,
Sakyo-ku
,
Kyoto 606
,
Japan)
材料科学技术（英文）
In two-phase TiAl alloys, the lamellar structures are of special interest and importance since they are so common and persistent. not only under as-cast conditions but also after thermal treatment. However. the lamellar structures are still poor in ductility,although they are beneficial for toughness and high temperature strength. This article will review the recent progress made in understanding the basic mechanical properties of the γ and α2 phases which comprise the two-phase alloys in Iamellar form, and discuss how an improved balance of strength and ductillty in the lamellar form may be achieved
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