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Some physical properties of Ni2MnGa Heusler shape memory alloys with substitutions

V. DOBREA1,* , M. LOZOVAN1, M.-L. CRAUS2, V. SIMKIN2

Affiliation

  1. NIRD for Technical Physics, 47 Mangeron Blvd., 700050, Iasi, Romania
  2. LNF – JINR, Dubna Russia, Joliot-Curie 6, 141980 Dubna, Mosk. Obl., Russia

Abstract

Ni2MnGa Heusler alloy is well known as potential smart material, is ferromagnetic and have a L21 type structure at RT. Our aim is to find structural and magnetic transitions in (Ni2-xCox)(Mn1-yCoy)(Ga1-zAlz) alloys. Some (Ni2-xCox)(Mn1-yCoy)(Ga1- zAlz) alloys were melted in a furnace in Ar atmosphere, homogenized at 1273 K and aged at 1073 K 48 hours. Phase composition and structural parameters (lattice constants, microstrains, average size of coherent blocks etc) were determined by XRD at room temperature. Magnetic measurements were performed by using a Foner type magnetometer at H = 4 kOe, between 77 and 673 K. Substituted alloys contain orthorhombic and cubic phases. The presence of Co leads to an increase of Curie temperature, but no martensite-austenite transition was observed in investigated range of temperatures for alloys substituted with Co..

Keywords

Shape memory alloy, Heusler alloy, Martensite, Curie temperature.

Submitted at: April 7, 2010
Accepted at: April 26, 2010

Citation

V. DOBREA, M. LOZOVAN, M.-L. CRAUS, V. SIMKIN, Some physical properties of Ni2MnGa Heusler shape memory alloys with substitutions, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 4, pp. 854-857 (2010)