Shape memory alloy (SMA): Material capable of overcoming large strains to return to a pre-deformed shape via a thermally induced martensitic phase transformation. In magnetic SMA, the shape change can be induced with a magnetic field

Drache, Jessica

Gaitzsch, Dr. Uwe

McDonald, Kenneth

Boise State University - ScholarWorks

Boise State UniversityScholarWorksCollege of Engineering Poster Presentations 2011 Undergraduate Research and ScholarshipConference4-11-2011The Electrodeposition of the Magnetic ShapeMemory Alloy Ni-Mn-GaKenneth McDonaldDepartment of Materials Science and Engineering, Boise State UniversityJessica DracheTU DresdenDr. Uwe GaitzschLeibniz-IFW DresdenElectrodeposition of the Magnetic Shape Memory Alloy Ni-Mn-GaKen McDonald1, Uwe Gaitzsch1,2, Jessica Drache1,3, Peter Müllner1, Paul Lindquist11 Boise State University, Boise ID USA, 2 Leibniz-IFW Dresden, Dresden, Germany, 3 TU Dresden, Dresden, Germany Introduction Future Research Deposition ParametersVs.Shape memory alloy (SMA): Material capable of overcoming large strains to return to a pre-deformed shape via a thermally induced martensitic phase transformation. In magnetic SMA, the shape change can be induced with a magnetic field.Electrodeposition Vs. Sputter Deposition•Less expensive Equipment            •More Energy Efficient           •Less Metal WasteX-Ray DiffractionGa/Mn/Ni Metal Bath Composition Current Density pH Range Avg. cathode efficiencyNickel 0.3M H3BO30.5M NiCl250mA/cm2 3.8-4.2 99%Manganese 1M (NH4)2SO40.59M MnSO465mA/cm2 3.0-4.7 65%Gallium 0.3M Ga2Cl30.5M NaH2C6H5O740mA/cm2 10.5-11.7 60%T Celsius/ t-min 700 750 800 90010 1.38µm 2.15µm 3.21µm 6.45µm30 2.40µm 3.73µm 5.56µm 11.2µm60 3.39µm 5.27µm 7.86µm 15.8µm180 5.88µm 9.13µm 13.6µm 27.4µm600 10.7µm 16.7µm 24.9µm 49.9µmAnnealing ParametersTable below depicts diffusion length of Nickel in Ni-Mn-Ga in micrometers at corresponding temperature and time.Ga/Mn/Ni layer order produced little alloying due to high oxide deposition when plating Mn onto Ga thus Ga/Ni/Mn order was used.    Layer order Ga/Ni/Mn VSM results showed much improvement over previous Ga/Mn/Ni results.  Samples with and without acetone treatment were used, with best results coming from acetone treated samples.  NiMnGa is a Heusler alloy, meaning it should show more magnetization than all of its magnetic components (which in NiMnGa is Nickel).  Results show a film (depicted by green line) emulating same magnetization as the NiMnGa experimental value (and much higher than Nickel value), providing evidence of Heusler alloy formation.          Results of VSM and XRD experiments support the conclusion that the NiMnGa Heusler alloy can be formed using an electrodeposition method. Samples with the lowest oxygen content have the same magnetization as bulk material with the same composition, and future work will be directed at lowering oxide formation.  ConclusionGa/Ni/MnVSM Results

The Electrodeposition of the Magnetic Shape Memory Alloy Ni-Mn-Ga

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The Electrodeposition of the Magnetic Shape Memory Alloy Ni-Mn-Ga

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