On the preparation of La(Fe,Mn,Si)13H  polymer-composites with optimized magnetocaloric properties

Radulov, I.; Skokov, Konstantin P.; Karpenkov, D.; Gottschall, Tino; Gutfleisch, Oliver

doi:10.1016/j.jmmm.2015.08.044

Cited by 79 publications

(43 citation statements)

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“…A magnetocaloric heat exchanger -the centerpiece of a refrigeration device -must be shaped out of MCE material, for instance as packed bed of particles, arranged plates or rods, drilled holes in a solid body [11] or more complex geometries [12]. To overcome the issue of shaping brittle MCE alloys and to address a high cycling stability, embedding the MCE material into a polymer [13,14], metallic matrix [15,16] or metallic cover [17] was suggested. Apart from such advanced approaches for improving the shapeability, knowledge about the basic mechanical properties such as Young's modulus, strength, or hardness of La(Fe, Si) 13 -type alloys is still rather vague.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of the magnetocaloric intermetallic LaFe11.2Si1.8 alloy at different length scales

et al. 2019

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In this work the global and local mechanical properties of the magnetocaloric intermetallic LaFe 11.2 Si 1.8 alloy are investigated by a combination of different testing and characterization techniques in order to shed light on the partly contradictory data in recent literature. Macroscale compression tests were performed to illuminate the global fracture behavior and evaluate it statistically. LaFe 11.2 Si 1.8 demonstrates a brittle behavior with fracture strains below 0.6 % and widely distributed fracture stresses of 180-620 MPa leading to a Weibull modulus of m = 2 to 6. The local mechanical properties, such as hardness and Young's modulus, of the main and secondary phases are examined by nanoindentation and Vickers microhardness tests. An intrinsic strength of the main magnetocaloric phase of at least 2 GPa is estimated. The significantly lower values obtained by compression tests are attributed to the detrimental effect of pores, microcracks, and secondary phases. Microscopic examination of indentation-induced cracks reveals that ductile α-Fe precipitates act as crack arrestors whereas pre-existing cracks at La-rich precipitates provide numerous 'weak links' for the initiation of catastrophic fracture. The presented systematic study extends the understanding of the mechanical reliability of La(Fe, Si) 13 alloys by revealing the correlations between the mechanical behavior of macroscopic multi-phase samples and the local mechanical properties of the single phases.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of the magnetocaloric intermetallic LaFe11.2Si1.8 alloy at different length scales

et al. 2019

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“…It can be seen that the maximum values of the volumetric -ΔS M are as high as 51, 49, and 35 mJ/cm 3 K around 263 K for the composites with 5, 10, and 15 wt % Bi contents, respectively. Although these values are lower than 102 mJ/cm 3 K for pure LaFe 11.6 Si 1.4 H 1.4 , such maxima are close to those of the LaFe 11.7 Si 1.3 C 0.2 H 1.8 (54.7 mJ/cm 3 K) composites [28] and La(Fe,Mn,Si) 13 H y (55–65 mJ/cm 3 K) bonded by the epoxy resin [31]. …”

Section: Resultsmentioning

confidence: 65%

Study of the Microstructure, Mechanical, and Magnetic Properties of LaFe11.6Si1.4Hy/Bi Magnetocaloric Composites

Liu

Sun

et al. 2018

Materials

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We have successfully synthesized LaFe11.6Si1.4Hy/Bi composites by cold pressing together with vacuum annealing technology, and systematically investigated the microstructure, magnetism, mechanical performance, and magnetocaloric properties. LaFe11.6Si1.4Hy particles are well surrounded by metallic Bi, without the formation of new phase. The maximum values of the volumetric magnetic entropy change -ΔSM are as high as 51, 49, and 35 mJ/cm3K around 263 K, for the composites with 5, 10 and 15 wt % Bi contents, respectively. The maximum value of the compressive strength for LaFe11.6Si1.4Hy/Bi composites increased continuously from 155 to 358 MPa with increasing Bi content, from 0 to 15 wt %.

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“…[99] Magneticd ipole coupling is aw eak interaction, and there are many cases where it does not play as ignificantr ole (e.g.,Ref. [100,101]). If only temperature-driven transitions without externalf ield are considered, there must be as et of minimum requirementsf or magnetostatic coupling between particles to occur.…”

Section: Across Cracks and Gapsmentioning

confidence: 99%

Coupling Phenomena in Magnetocaloric Materials

et al. 2018

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Strong coupling effects in magnetocaloric materials are the key factor to achieve a large magnetic entropy change. Combining insights from experiments and ab initio calculations, we review relevant coupling phenomena, including atomic coupling, stress coupling, and magnetostatic coupling. For the investigations on atomic coupling, we have used Heusler compounds as a flexible model system. Stress coupling occurs in first‐order magnetocaloric materials, which exhibit a structural transformation or volume change together with the magnetic transition. Magnetostatic coupling has been experimentally demonstrated in magnetocaloric particles and fragment ensembles. Based on the achieved insights, we have demonstrated that the materials properties can be tailored to achieve optimized magnetocaloric performance for cooling applications.

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On the preparation of La(Fe,Mn,Si)13H polymer-composites with optimized magnetocaloric properties

Cited by 79 publications

References 50 publications

Mechanical properties of the magnetocaloric intermetallic LaFe11.2Si1.8 alloy at different length scales

Mechanical properties of the magnetocaloric intermetallic LaFe11.2Si1.8 alloy at different length scales

Study of the Microstructure, Mechanical, and Magnetic Properties of LaFe11.6Si1.4Hy/Bi Magnetocaloric Composites

Coupling Phenomena in Magnetocaloric Materials

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