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Transformation behavior of two Ni–Mn–Ga alloys

  • O. Söderberg EMAIL logo , M. Friman , A. Sozinov , N. Lanska , Y. Ge , M. Hämäläinen and V. K. Lindroos
Published/Copyright: February 8, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 8

Abstract

The transformation behavior of Ni50.5Mn30.4Ga19.1 and Ni53.7Mn26.4Ga19.9 was studied with ac magnetic susceptibility, differential scanning calorimetry, in-situ optical microscopy and X-ray diffractometry. The liquidus, solidus and L21⟶B2’ temperatures were detected for the alloys. The transformation enthalpies of melting, solidification and martensitic/reverse reactions were determined. In Ni53.7Mn26.4Ga19.9 the magnetic transition was clearly below the parent to martensite phase transformation and did not have hysteresis. The transformation sequence is suggested as Pparam ⟶Tparam ⟶ Tferrom with reverse reactions in respective order. In Ni50.5Mn30.4Ga19.1 the temperatures of the magnetic transition and structural phase transformations are close to each other and the Curie temperature shows a hysteresis of 9 K during cooling-heating cycle. Based on the combined measurements, the transformation sequences are assumed to be during cooling Pparam ⟶ 7Mparam ⟶ 7Mferrom ⟶ Tferrom and Tferrom ⟶ Tparam ⟶ 7Mparam ⟶ Pparam during heating. Consequently, the hysteresis in the magnetic transition is explained with the intermartensitic reaction and the difference of the Curie points of 7M and T phases.

Keywords: Martensitic phase transformation; Ni –Mn–Ga alloys; Differential Scanning Calorimetry (DSC); Magnetic susceptibility; X-ray diffractometry
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Received: 2003-12-22
Accepted: 2004-05-25
Published Online: 2022-02-08

© 2004 Carl Hanser Verlag, München

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https://doi.org/10.1515/ijmr-2004-0134
Keywords for this article
Martensitic phase transformation; Ni –Mn–Ga alloys; Differential Scanning Calorimetry (DSC); Magnetic susceptibility; X-ray diffractometry

Articles in the same Issue

  1. Frontmatter
  2. Articles Basic
  3. Thermodynamic modeling of the Ni–S system
  4. Some control mechanisms of spatial solidification in light alloys
  5. Density and excess volume of liquid copper, nickel, iron, and their binary alloys
  6. The absolute thermoelectric power of Nb–Mo alloys
  7. Articles Applied
  8. Structural and mechanical characteristics of ZA27-7 wt.% SiC composites produced by powder metallurgy techniques
  9. Calorimetric study of Zn13La
  10. Effect of grain size on the static strain aging of a ULC-bake hardening steel
  11. Kinetics of ferrite to Widmanstätten austenite transformation in a high-strength low-alloy steel revisited
  12. Transformation behavior of two Ni–Mn–Ga alloys
  13. Notifications/Mitteilungen
  14. Personal/Personelles
  15. News/Aktuelles
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