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Thesis - Abdul Quader.pdf (4.22 MB)

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MARTENSITIC PHASE TRANSFORMATION IN NI-MN-GA BASED HEUSLER ALLOYS

Quader, Abdul
http://rave.ohiolink.edu/etdc/view?acc_num=miami1501240663677547

Abstract Details

2017, Master of Science, Miami University, Physics.
Ni2MnGa is a Heusler alloy that exhibits a first order martensitic phase transition near 200 K upon cooling. Recent study showed that when Mn was partially replaced with Cr in Ni2Mn1-xCrxGa, the martensitic transformation temperature increased with increasing Cr concentration. At the same time, a sharp drop in electrical resistivity was observed in the system, and the magnitude of the drop increased with increasing Cr content. In an attempt to better understand these observations, in this thesis a series of Heusler alloys that include Ni2-xCrxMnGa, Ni1.75Cr0.25Mn0.75Co0.25Ga, Ni1.9Cr0.1Mn0.75Co0.25Ga, and Ni2.15Cr0.1MnGa have been investigated. The samples were fabricated by conventional vacuum arc melting technique in argon atmosphere. The characterization of the samples were performed by x-ray diffraction, dc magnetization, differential scanning calorimetry, and electrical resistivity measurements. The experimental results revealed interesting properties of the alloys that include existence of multiple magnetic and structural phases, coupled and decoupled phase transitions, large change in electrical resistivity in the vicinity of the martensitic phase transformation, and large magnetocaloric effects in selected compounds. The experimental results have been discussed in detail considering the intrinsic properties of the materials.
Dr Mahmud Khan (Advisor)
Dr. Khalid F. Eid (Committee Member)
Dr. Herbert Jaeger (Committee Member)
60 p.
Physics
Heusler Alloys; Martensitic Transformation; Ni2MnGa; Ni-Mn-Ga based Heusler Alloys; Magnetocaloric effect; MCE; Refrigerant Capacitance; RCEFF; RC

Recommended Citations

Citations

  • Quader, A. (2017). MARTENSITIC PHASE TRANSFORMATION IN NI-MN-GA BASED HEUSLER ALLOYS [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501240663677547

    APA Style (7th edition)

  • Quader, Abdul. MARTENSITIC PHASE TRANSFORMATION IN NI-MN-GA BASED HEUSLER ALLOYS. 2017. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1501240663677547.

    MLA Style (8th edition)

  • Quader, Abdul. "MARTENSITIC PHASE TRANSFORMATION IN NI-MN-GA BASED HEUSLER ALLOYS." Master's thesis, Miami University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501240663677547

    Chicago Manual of Style (17th edition)

miami1501240663677547
543
© 2017, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.
Release 3.2.12