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Martensitic Transformations of Ni–Mn–X Heusler Alloys with X = Ga, In and Sn

  • Peter Entel
  • Markus E. Gruner
  • Mehmet Acet
  • Asli Çahır
  • Raymundo Arroyave
  • Thien Duong
  • Anjana Talapatra
  • Ibrahim Karaman
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Martensitic transformations of rapidly quenched and less rapidly cooled Heusler alloys of type Ni–Mn–X with X = Ga, In and Sn are investigated by ab initio calculations. For the rapidly cooled alloys, we obtain the magnetocaloric properties near the magnetocaloric transition. For the less rapidly quenched alloys these magnetocaloric properties start to change considerably. This shows that none of the Heulser alloys is in thermal equilibrium. Instead, each alloy transforms during temper-annealing into a dual-phase composite alloy. The two phases are identified to be cubic Ni–Mn–X and tetragonal NiMn.

Keywords

Magnetocaloric effect Heusler alloys First order phase transitions Segregation 

Notes

Acknowledgements

We acknowledge support by the DFG priority program 1599 “ferroic cooling”. Calculations were carried out on the magnitude supercomputer (DFG grant INST 20876/208-1) at the CCSS at University of Duisburg-Essen.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Peter Entel
    • 1
  • Markus E. Gruner
    • 1
  • Mehmet Acet
    • 1
  • Asli Çahır
    • 2
  • Raymundo Arroyave
    • 3
  • Thien Duong
    • 3
  • Anjana Talapatra
    • 3
  • Ibrahim Karaman
    • 3
  1. 1.Faculty of Physics and CENIDEUniversity of Duisburg-EssenDuisburgGermany
  2. 2.Metalurji Ve Malzeme Mühendisliği BölümüMuğla ÜniversitesiMuğlaTurkey
  3. 3.Department of Materials Science & EngineeringTexas A&M UniversityCollege StationUSA

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