Mechanical properties of Heusler alloys

Abstract

Heusler alloys have been a significant topic of research due to their unique electronic structure, which exhibits half-metallicity, and a wide variety of properties such as magneto-calorics, thermoelectrics, and magnetic shape memory effects. As the maturity of these materials grows and commercial applications become more near-term, the mechanical properties of these materials become an important factor to both their processing as well as their final use. Very few studies have experimentally investigated mechanical properties, but those that exist are reviewed within the context of their magnetic performance and application space with specific focus on elastic properties, hardness and strength, and fracture toughness and ductility. A significant portion of research in Heusler alloys are theoretical in nature and many attempt to provide a basic view of elastic properties and distinguish between expectations of ductile or brittle behavior. While the ease of generating data through atomistic methods provides an opportunity for wide reaching comparison of various conceptual alloys, the lack of experimental validation may be leading to incorrect conclusions regarding their mechanical behavior. The observed disconnect between the few available experimental results and the numerous modeling results highlights the need for more experimental work in this area.

First‐principles study on structural, electronic, magnetic, elastic, mechanical and thermodynamic properties of Mn 2 PtCo Heusler alloy

“…We have calculated the values of bulk modulus and shear modulus as 186 and 144.83 GPa, respectively using Equations ). The half HAs have low magnetic moment value and low bulk modulus, whereas the full HAs (like the present case) show high magnetic moment and high bulk modulus value 93 . Second, a high shear modulus value shows greater elastic bending in the material.…”

First principles study of electronic, elastic, optical and magnetic properties of Rh2MnX (X = Ti, Hf, Sc, Zr, Zn) Heusler alloys

“…After their discovery by F. Heusler [1, 2] in 1903, Heusler alloys became an indispensable group of materials for rapidly developing technology with their widespread use [3–10]. For example, they are excellent candidates for spintronics, shape memory alloys, ferroics, magneto‐caloric materials, skyrmions, and so forth [11].…”

Influence of Multi-Axial Isothermal Forging on the Stability of Martensitic Transformation in a Heusler Ni-Mn-Ga Alloy

“…Despite the reduced magnitude of the effect on polycrystals as compared to single crystals, it is sufficient to consider these materials as appropriate for magnetically controlled devices. For monocrystalline and polycrystalline specimens, a general disadvantage is reduced mechanical properties [7]. At multiple cycles of martensitic transformation, the functional effect decreases and the specimen can be fractured [8].…”