Dynamic re-equilibration controlled multi-step transformations in (Mn, Fe)2(P, Si) alloys
Abstract
In (Mn, Fe)2(P, Si) alloys crystallographic first-order phase transformations enable strong coupling of magnetic and entropic properties, potentially leading to high-efficiency energy generation and refrigeration applications. Although hysteresis losses that limit these applications can be reduced through careful control of alloy composition, compositional tuning can also unfavorably influence transformation temperatures and magnetocaloric coupling strength. Hence, exploration of additional processing variables enabling independent control of transformation properties is crucial. In this work, we investigate the role of thermal history as an additional processing variable, exploiting thermally-activated mechanisms to control properties of non-diffusive transformations in (Mn, Fe)2(P, Si) alloys. In so doing, we report an unusual transformation-splitting phenomenon following annealing at intermediate times, where a single well-defined magneto-structural transformation evolves towards a multi-step transformation with individual steps occurring at multiple distinct temperatures. Here, on longer annealing at the same temperatures, single-step transformation behavior is recovered. Through additional magnetic and crystallographic characterization, we show that the thermal history-controlled multi-step behavior results from sluggish thermally-activated diffusion. The two-step transformation corresponds to non-equilibrium bimodal composition distributions in the transforming phase, and these develop through a dynamic re-equilibration process as the alloy passes relatively slowly between different thermal equilibria. Together, these results suggest that thermal historymore »
- Authors:
-
- Texas A & M Univ., College Station, TX (United States)
- Louisiana State Univ., Baton Rouge, LA (United States)
- Publication Date:
- Research Org.:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US National Science Foundation, Division of Civil, Mechanical and Manufacturing Innovation (CMMI) Program; NSF Graduate Research Fellowship Program
- OSTI Identifier:
- 1872899
- Alternate Identifier(s):
- OSTI ID: 1605304
- Grant/Contract Number:
- SC0010521; FG02-13ER46946
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. D, Applied Physics
- Additional Journal Information:
- Journal Volume: 53; Journal Issue: 20; Journal ID: ISSN 0022-3727
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; magnetocaloric effect; phase transitions; thermal hysteresis; solid state phase transformation
Citation Formats
Brown, T. D., Chen, J-H, Braham, E. J., Stadler, S., and Shamberger, Patrick J. Dynamic re-equilibration controlled multi-step transformations in (Mn, Fe)2(P, Si) alloys. United States: N. p., 2020.
Web. doi:10.1088/1361-6463/ab768a.
Brown, T. D., Chen, J-H, Braham, E. J., Stadler, S., & Shamberger, Patrick J. Dynamic re-equilibration controlled multi-step transformations in (Mn, Fe)2(P, Si) alloys. United States. https://doi.org/10.1088/1361-6463/ab768a
Brown, T. D., Chen, J-H, Braham, E. J., Stadler, S., and Shamberger, Patrick J. Wed .
"Dynamic re-equilibration controlled multi-step transformations in (Mn, Fe)2(P, Si) alloys". United States. https://doi.org/10.1088/1361-6463/ab768a. https://www.osti.gov/servlets/purl/1872899.
@article{osti_1872899,
title = {Dynamic re-equilibration controlled multi-step transformations in (Mn, Fe)2(P, Si) alloys},
author = {Brown, T. D. and Chen, J-H and Braham, E. J. and Stadler, S. and Shamberger, Patrick J.},
abstractNote = {In (Mn, Fe)2(P, Si) alloys crystallographic first-order phase transformations enable strong coupling of magnetic and entropic properties, potentially leading to high-efficiency energy generation and refrigeration applications. Although hysteresis losses that limit these applications can be reduced through careful control of alloy composition, compositional tuning can also unfavorably influence transformation temperatures and magnetocaloric coupling strength. Hence, exploration of additional processing variables enabling independent control of transformation properties is crucial. In this work, we investigate the role of thermal history as an additional processing variable, exploiting thermally-activated mechanisms to control properties of non-diffusive transformations in (Mn, Fe)2(P, Si) alloys. In so doing, we report an unusual transformation-splitting phenomenon following annealing at intermediate times, where a single well-defined magneto-structural transformation evolves towards a multi-step transformation with individual steps occurring at multiple distinct temperatures. Here, on longer annealing at the same temperatures, single-step transformation behavior is recovered. Through additional magnetic and crystallographic characterization, we show that the thermal history-controlled multi-step behavior results from sluggish thermally-activated diffusion. The two-step transformation corresponds to non-equilibrium bimodal composition distributions in the transforming phase, and these develop through a dynamic re-equilibration process as the alloy passes relatively slowly between different thermal equilibria. Together, these results suggest that thermal history primarily controls the transformation properties of (Mn, Fe)2(P, Si) alloys indirectly through the composition of one or more transforming phases. Additional investigations are needed to develop thermal history processing for decoupling hysteresis control from other transformation properties.},
doi = {10.1088/1361-6463/ab768a},
journal = {Journal of Physics. D, Applied Physics},
number = 20,
volume = 53,
place = {United States},
year = {Wed Mar 18 00:00:00 EDT 2020},
month = {Wed Mar 18 00:00:00 EDT 2020}
}
Web of Science
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