Strong magnetization was observed in a cyclically deformed 35at%Al alloy upon introducing a high density of antiphase-boundary tubes. In order to introduce a large plastic deformation without changing the specimen dimensions, compressive deformation was repeatedly applied along mutually orthogonal stress axes under a constraint imposed across the stress axes. Clear evidence was obtained for attributing the major cause of the large magnetization to the production of a high density of antiphase-boundary tubes. The contribution of the antiphase-boundary tubes to the strong magnetization and to work-hardening was analyzed on the basis of quantitative analyses of the microstructures introduced by cyclic deformationStrong Magnetization by Antiphase-Boundary Tubes in a Cyclically Deformed Fe-35at%Al Alloy. K.Yamamoto, S.Miyazaki, S.Kumai, A.Sato: Philosophical Magazine, 2003, 83[12], 1431-49