Dilatometer for measurements of linear dimension variations under the effects of temperature, magnetic field and mechanical stress

被引:12
作者
Cherepin, VT [1 ]
Glavatska, NI [1 ]
Glavatsky, IN [1 ]
Gavriljuk, VG [1 ]
机构
[1] NASU, GV Kurdyumov Inst Metal Phys, UA-03680 Kiev 142, Ukraine
关键词
dilatometry; magnetic field strength; mechanical stress; phase transformations; temperature control;
D O I
10.1088/0957-0233/13/2/306
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A multi-purpose automated dilatometer has been developed for simultaneous measurements of the expansion/contraction under the effects of magnetic field and/or mechanical stress and/or temperature. The differential capacitive position sensor, operating together with the microprocessor controlled digital transformer bridge, is used as a displacement transducer with the resolution of several tens of nanometres. Measurements are accomplished in the temperature range from -150 to 200 C. The automatically controlled variation of the applied magnetic field is provided by the electromagnet with the field homogeneity of 0.5 x 10(-5) of the magnetic field strength (maximum 1.1 T). A special controlling system is developed for the automated mechanical loading of the sample under investigation. Some examples of the measurements completed on the magnetic shape memory alloy Ni2MnGa are presented for three cases: (i) strain as a function of the applied magnetic field; (ii) creep under constant magnetic field or mechanical stress; and (iii) phase transformations during heating/cooling with and without the applied magnetic field.
引用
收藏
页码:174 / 178
页数:5
相关论文
共 10 条
[1]  
CHEKHOVSKOY VY, 1999, PRIB TEKH EKSP, V6, P130
[2]  
CHEREPIN VT, 1966, T INDIAN I METALS, V19, P108
[3]  
CHEREPIN VT, 1968, EXPT TECHNIQUES PHYS, P200
[4]   Isomagnetic martensitic transformation in Ni2MnGa alloys [J].
Glavatska, NI ;
Ullakko, K .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 218 (2-3) :256-260
[5]   Large field-induced strains in ferromagnetic shape memory materials [J].
James, RD ;
Tickle, R ;
Wuttig, M .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 273 :320-325
[6]  
NOVIK AI, 1998, TECH ELECTRODYN, V2, P76
[7]  
NOVIK AI, 1997, TECH ELECTRODYN, V5, P65
[8]   Model for strain and magnetization in magnetic shape-memory alloys [J].
O'Handley, RC .
JOURNAL OF APPLIED PHYSICS, 1998, 83 (06) :3263-3270
[9]   Magnetically controlled shape memory alloys: A new class of actuator materials [J].
Ullakko, K .
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 1996, 5 (03) :405-409
[10]   Large magnetic-field-induced strains in Ni2MnGa single crystals [J].
Ullakko, K ;
Huang, JK ;
Kantner, C ;
OHandley, RC ;
Kokorin, VV .
APPLIED PHYSICS LETTERS, 1996, 69 (13) :1966-1968