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Microstructure and Property Evolution in Cold Worked Equiatomic Fe-Pd During Isothermal Annealing.

Deshpande, Anirudha Rajendra (2004) Microstructure and Property Evolution in Cold Worked Equiatomic Fe-Pd During Isothermal Annealing. Master's Thesis, University of Pittsburgh. (Unpublished)

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In this work the evolution of microstructure and magnetic properties in cold deformed, equiatomic FePd during isothermal annealing has been studied. During annealing of the disordered cold deformed FePd at temperatures below the critical ordering temperature, Tc = 928 K (655 ºC), concomitant annealing and ordering (FCC -> L1sub0) reactions take place. The effects of the processing parameters - stored energy of cold work and temperature - on microstructural and property evolution are investigated. The combined solid state reaction (CR) produces complex microstructures that exhibit enhanced magnetic hardness (coercivity) relative to the conventionally processed material. The magnetic age hardening response of the CR processed FePd has been reported. For fully equiaxed polycrystalline microstructures of the ordered FePd phase a correlation between the average grain size and the coercivity has been observed. Based on these purely microstructural observations a qualitative coercivity mechanism analysis has been performed in order to elucidate the origin of the decrease in magnetic hardness (coercivity) in the overaged condition.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Deshpande, Anirudha Rajendraard24@pitt.eduARD24
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWiezorek, Jorg M Kwiezorek@pitt.eduWIEZOREK
Committee MemberSoffa, W Awsoffa@pitt.eduWSOFFA
Committee MemberBarnard, J Ajbarnard@engr.pitt.eduJBARNARD
Date: 9 June 2004
Date Type: Completion
Defense Date: 9 April 2004
Approval Date: 9 June 2004
Submission Date: 3 April 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: MSMSE - Master of Science in Materials Science and Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: annealing; Combined reactions; Electron microscopy; Fe-Pd; ferromagnetic materials; L1sub0 intermetallics; magnetic properties; Thermomechanical processing
Other ID:, etd-04032004-112438
Date Deposited: 10 Nov 2011 19:33
Last Modified: 15 Nov 2016 13:38


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