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Manufacturing of Nanostructure-Enhanced Mn-Al-base Materials for High Performance Permanent Magnets via Optimization of Orthogonal Cutting Based Machining

Jo, Jaehyuk (2022) Manufacturing of Nanostructure-Enhanced Mn-Al-base Materials for High Performance Permanent Magnets via Optimization of Orthogonal Cutting Based Machining. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Continuous growing demands on renewable energy technologies lead rare earth free permanent
magnet (PM) development. Current state of the art PM materials rely on rare earth elements and
the environmental and economic impacts of the rare earth element (REE) are evident. Manganese
based PM has been considered as prospective rare earth free (REF) PM including Manganese
aluminum (MnAl) alloy. Ongoing research efforts to realize the merits of MnAl based PM are not
satisfying.
This Investigation explores the novel manufacturing process to produce high performance MnAl
PM materials. Machining based orthogonal cutting process is utilized to expose severe plastic
deformation (SPD) on the bulk feedstock materials. Examine and post machining process shows
orthogonal cutting of MnAl bulk alloy can produce nano-scale internal structure with stored cold
work which beneficial for enhanced phase transformation kinetics towards the ferromagnetic
phase. Measured magnetic energy product BH(max) of the manufactured MnAl PM materials
showing promising results for further studies on machining based PM materials manufacturing.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Jo, Jaehyukjaj109@pitt.edujaj109
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWiezorek, Jörg M.Kwiezorek@pitt.edu
Committee MemberWang, Goufengguw8@pitt.edu
Committee MemberChmielus, Markuschmielus@pitt.edu
Committee MemberShankar, M. Raviravishm@pitt.edu
Date: 6 September 2022
Date Type: Publication
Defense Date: 19 July 2022
Approval Date: 6 September 2022
Submission Date: 29 July 2022
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 143
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Rare earth Free permanent magnet, Manganese Aluminum alloy, Machining, Severe plastic deformation process, Magnetic properties
Date Deposited: 06 Sep 2022 16:44
Last Modified: 06 Sep 2022 16:44
URI: http://d-scholarship.pitt.edu/id/eprint/43412

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