Deformation behaviour of L10(3R) type Ni-Al martensite was observed by tensile testing, optical-and electron-microscopy and X-ray diffraction. When the specimen initially consisting of four pairs of internally twinned L10 variants is pulled along a < 001> β 1 axis of the mother phase, it becomes a single crystal of L10 martensite in the < 001> L10 orientation without internal twins or any defect at the final deformation stage (∼13% elongation). If the tensile axis is near the < 011> β 1 axis, the specimen with the same variants configuration as the former one becomes twinned crystals of a single twin-system. It was found that in both cases the essential feature of deformation is detwinning of original internal twins formed during martensitic transformation and simultaneously a small amount of the rigid body rotation of variant crystals. The mechanism of the process of detwinning and reorientation of variant crystals in L10 type martensite, and the available plastic strain and its orientation dependence estimated from the above process are discussed.
(Received November 28, 1980)
*Department of Materials Science and Engineering, Osaka University, Yamada-kami, Suita, Osaka 565, Japan.
**Institute of Metal Physics, Ukrainian Acad. Sciences, Vernadskogo st. 36, Kiev-142, USSR.
© 2002 The Japan Institute of Metals
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