Tracing Memory in Polycrystalline Ferromagnetic Shape-Memory Alloys (pages 2392–2396)
Y.-D. Wang, Y. Ren, H. Li, H. Choo, M. L. Benson, D. W. Brown, P. K. Liaw, L. Zuo, G. Wang, D. E. Brown and E. E. Alp
Article first published online: 12 SEP 2006 | DOI: 10.1002/adma.200600480
In situ high-energy X-ray diffraction experiments reveal the influence of various microstresses and grain orientations on the memory effect in polycrystalline Ni2MnGa ferromagnetic shape-memory alloys during phase transformation (see figure). The “memory” of grain orientation and intergranular stress is evident; however, the microscale “memory” is degraded due to the existence of the intragranular stress.