Effect of external stress and bias magnetic field on transformation strain of heusler alloy Ni-Mn-Ga

来源期刊：中国有色金属学报(英文版)2003年第1期

论文作者：高智勇 蔡伟 赵连城 吴光恒 陈京兰 詹文山

文章页码：42 - 45

Key words：Ni_52.9Mn_24.4Ga_22.7 single crystal; external compress stress; bias magnetic field; transformation strain

Abstract: The influence of external field(magnetic field and stress field) on the transformation strain of Ni_52.9-Mn_24.4Ga_22.7 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.