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(Unpublished)
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Unpublished |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: |
|
| ETD Committee: |
|
| 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 2023 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/43412 |
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