粘结NiMnGaSi合金的结构相变和大磁致应变研究.pdfVIP

23 3 Vol.23 No.3 2 0 0 9 6 CHINESE JOURNAL OF MATERIALS RESEARCH June 2 0 0 9 NiMnGaSi ∗ ( 318000) ÆÆ NiMnGaSi , . MS 308 K, TC 358 K. NiMnGaSi 300 K0.7 T 0.56% . , Æ, , , , NiMnGa TG139 1005-3093(2009)03-0327-05 An investigation of structure transformation and giant magnetic-field-induced strain in bonded NiMnGaSi alloy CAI Peiyang FENG Shangshen∗∗ XUE Shuangxi ZHOU Ying CHEN Weiping (Faculty of Physics and Electronic Engineering, Taizhou University, Taizhou 318000) * Supported by the Key Project of Science and Technology Department of Zhejiang Province No.2006C21085. Manuscript received September 23, 2008; in revised form February 19, 2009. ** To whom correspondence should be addressed, Tel:(0576 E–mail:fss@tzc.edu.cn ABSTRACT NiMnGaSi alloy powder was prepared by diffusion-reduction method and then bonded and shaped a cuboid. The magnetic properties of the sample show that a martensitic transformation starts at 308 K and the Curie temperature is 358 K. The NiMnGaSi alloy shows a 0.56% giant strain at room temperature under a magnetic field of 0.7 T. KEY WORDS metallic materials, diffusion-reduction method, bonded, martensitic transformation, magnetic field induced strain, NiMnGa alloys NiMnGa , , NiMnGa , , Æ [7−11] . NiMnGa , [1−4] . Æ, , , [5] Murray 2000 6% , Sozinoy , [6] 2002 9.5% . .