Textured, dense and giant magnetostrictive alloy from fissile polycrystal

Textured materials usually promise an enhanced physical effect along their preferred orientation. However, how to orientate the material, especially from a fissile alloy, is still a great challenge. The transition-metal-based alloy, MnCoSi, is a potential low-cost magnetostrictive material, which application is limited by the poor mechanical property and reduced magnetostriction in polycrystal. Here, we demonstrate that, through the approach of high magnetic field solidification with a slow cooling rate, some textured and dense MnCoSi1−x alloys are obtained, which exhibit giant magnetostriction and enhanced manufacturing performance. Meanwhile, by introducing vacancies of Si element, the metamagnetic transition of MnCoSi alloy is adjusted, giving rise to the room-temperature and reversible magnetostriction under reduced driving magnetic field, which is of significance for the practical applications.