中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 13 No. 1 February 2003 |
on transformation strain of
heusler alloy Ni-Mn-Ga
（1. School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001, China;
2. State Key Laboratory for Magnetism,
Institute of Physics, Chinese Academy of Science,Beijing 100080, China）
Abstract:The influence of external field(magnetic field and stress field) on the transformation strain of Ni52.9-Mn24.4Ga22.7 single crystal were investigated and its mechanism was also discussed. When thermally martensitic transformation occurs, about 0.25% transformation strain is obtained which may be obviously enhanced to about 0.8% by a 6000Oe magnetic bias field. However, the strain decreases by the external compress stress loaded along the strain-measured direction. When the external compress stress and bias magnetic field are simultaneously applied, the transformation strain decreases with increasing the magnetic field, which is related to the rearrangement of the martensite variants influenced by the external field.
Key words: Ni52.9Mn24.4Ga22.7 single crystal; external compress stress; bias magnetic field; transformation strain
