%0 Journal Article
%T Effect of internal stress on sructure, martensitic transformation and magnetic properties of ferromagnetic shape memory alloy Mn2NiGa<br>内应力对Mn2NiGa铁磁形状记忆合金的结构、相变和磁性能的影响
%A Song Rui-Ning
%A Zhu Wei
%A Liu En-Ke
%A Li Gui-Jiang
%A Chen Jing-Lan
%A Wang Wen-Hong
%A Li Xiang
%A Wu Guang-Heng
%A <br>宋瑞宁
%A 朱伟
%A 刘恩克
%A 李贵江
%A 陈京兰
%A 王文洪
%A 李祥
%A 吴光恒
%J 物理学报
%D 2012
%I 
%X The structures, the martensitic transformations and the magnetic properties of ferromagnetic shape memory alloy Mn2NiGa with the loading and the unloading of the external compressive stress are investigated. The plastic deformation occurring during the stressing causes a high level of dislocation defects existing in the sample. The residual internal stress results in a significant increase of the reversed transformation temperature. The threshold value of compressive pressure for causing the completely martensitic transformation at room temperature is identified to be 1.0 GPa based on the experimental measurements of XRD and magnetic coercivity. The coercivity of the martensitic phase increases from 50 Oe to 350 Oe due to the application of the external stress up to 2.0 GPa. It is also observed that the reversed martensitic transformation occurrs, when the sample is treated by heating up to about 730 K. This is attributed to the elimination of the dislocation by the annealing effect. Such a high reverse martensitic transformation temperature allows the measurement of the Curie temperature of martensitic phase and the obtained value is 530 K.
%K ferromagnetic shape memory alloys
%K Mn2NiGa
%K residual internal stress
%K martensitic transformation<br>铁磁形状记忆合金
%K Mn2NiGa
%K 残余内应力
%K 马氏体相变
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=4C92C33EB4B06FC59266E7A3F1CEB07A&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=0B39A22176CE99FB&sid=878198CA9E19C5E7&eid=878198CA9E19C5E7&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=14