High-entropy bulk metallic glasses as promising magnetic refrigerants

Abstract

Articles you may be interested inTunable magnetic and magnetocaloric properties in heavy rare-earth based metallic glasses through the substitution of similar elements Magnetocaloric effect of Ho-, Dy-, and Er-based bulk metallic glasses in helium and hydrogen liquefaction temperature range Appl. Phys. Lett. 90, 211903 (2007); 10.1063/1.2741120Behavior of some heavy and light rare earth-cobalt magnets at high temperature Electronegativity of the constituent rare-earth metals as a factor stabilizing the supercooled liquid region in Albased metallic glasses (RE ¼ Gd, Dy, and Tm) high-entropy bulk metallic glasses (HE-BMGs) with good magnetocaloric properties are fabricated successfully. The HE-BMGs exhibit a second-order magnetic phase transition. The peak of magnetic entropy change (DS pk M ) and refrigerant capacity (RC) reaches 15.0 J kg À1 K À1 and 627 J kg À1 at 5 T, respectively, which is larger than most rare earth based BMGs. The heterogeneous nature of glasses also contributes to the large DS pk M and RC. In addition, the magnetic ordering temperature, DS pk M and RC can be widely tuned by alloying different rare earth elements. These results suggest that the HE-BMGs are promising magnetic refrigerant at low temperatures. V C 2015 AIP Publishing LLC.

Structure property relationship in (TiZrNbCu)1−xNix metallic glasses

“…Variations of both atomic structure and electronic structure with x show a pronounced change for x≥0. 35 which is reflected in all properties studied, namely thermal stability parameters, Debye temperatures, boson peaks, magnetic, elastic and electronic transport properties all show changes in their concentration dependence for x≥0. 35.…”

“…35 which is reflected in all properties studied, namely thermal stability parameters, Debye temperatures, boson peaks, magnetic, elastic and electronic transport properties all show changes in their concentration dependence for x≥0. 35. The results are compared with those for binary and ternary MGs of the same elements.…”

“…Further, the critical thickness of HE-BMGs is generally lower than that of conventional BMGs [15]. More recently the situation has started to change and several studies showing the conceptual and technological relevance of a-HEAs appeared [18,34,35,36].…”

Change of electronic properties on transition from high-entropy to Ni-rich (TiZrNbCu)1−xNi alloys

“…This may be influenced by the fact that glass forming ability (GFA) of known a-HEAs is inferior in comparison to the best glass former in a particular alloy system [15,17,33]. However, in the last couple of years several comprehensive studies showing novel effects in a-HEAs have been published (e.g., [33,34,35,36,37,38]).…”

Parametric Study of Amorphous High-Entropy Alloys formation from two New Perspectives: Atomic Radius Modification and Crystalline Structure of Alloying Elements

“…Solid solution forming alloys have been developed in conventional alloys where there exits only one dominant element, and amorphous alloys used to be explored near eutectic compositions1718. With the design concept of HEAs becoming more accepted by the materials community, more and more simple face-center cubic (FCC), body-center cubic (BCC), and hexagonal close-packed (HCP) solid solution forming HEAs and amorphous HEAs have been developed, some of which exhibit good mechanical1920212223, physical24252627, chemical28 and biomedical13 properties. Therefore, HEAs provide new opportunities to design new alloys with potentially new properties.…”