A comparative study of alloys based on the binary equiatomic Ni50Mn50 alloy doped with 10 at.% Ti
DOI:
https://doi.org/10.54708/26587572_2026_822567Keywords:
martensite, shape memory alloys, Ni50Mn40Ti10, Mn50Ni40Ti10, microhardness, phase transformationsAbstract
A large number of studies have been devoted to the study of alloys based on the Ni2MnMe system, as they exhibit thermoelastic martensitic transformation (TMT), which provides a shape memory effect, including magnetically controlled. Depending on the alloying composition, the MT temperature can be controlled in this group of alloys. In recent decades, alloys based on the Mn2NiMe system, particularly those alloyed with titanium, have begun to be studied. However, insufficient research has been conducted on this alloys to date. The effect of alloying a binary equiatomic alloy of the composition Ni50Mn50 with 10 at.% titanium by substituting manganese and nickel was investigated. It was found that in both cases, the MT temperatures decrease. For the Ni50Mn40Ti10 alloy, Ms = 510 K, and for the Mn50Ni40Ti10 alloy, Ms = 420 K. The change in microhardness does not correlate with the change in MT. In the first case, it increases slightly, and in the second, it decreases almost 2 times. Using X-ray diffraction analysis (XRD), it was found that in the first alloy only orthorhombic 10M martensite is observed, while in the second, monoclinic 10M martensite and a second phase with hexagonal crystal lattice type are observed. Scanning electron microscopy (SEM) images of the microstructure show a grain structure with packets of martensitic platelets. In the Mn50Ni40Ti10 alloy, grains without martensite are additionally observed. Dendritic precipitates are observed within these grains.References
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