Behaviour of Internal Stress in Melt-Spun Ni-Mn-Ga Ribbons
ZHAO Wei-Ren1, LI Jian-Liang2, QI Yan2, WANG Xin-Lin2
1Department of Physics, Shantou University, Shantou 515063
2Institute of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081
Behaviour of Internal Stress in Melt-Spun Ni-Mn-Ga Ribbons
1Department of Physics, Shantou University, Shantou 515063
2Institute of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081
Abstract： We investigate the martensitic transition of melt-spun Ni-Mn-Ga ribbons, during which an abrupt release of internal stress occurs. The release results in the appearance of two peaks on the curve of field-induced strains versus temperature. During and after the transformation, a large lag of field-induced strains was observed, indicating a competition between the stress energy and Zeemann energy. The lag leads to an unusual relation of the strains to the inducing field.
2003, Vol. 20 
