Abstract
The effect of rare earth element Gd additions in an Ni–Mn–Ga alloy on magnetocaloric effect has previously been investigated. In this paper, the microstructure of Ni 53.4Mn 20Ga 25.6Gd 1 was studied by TEM. The results show that Gd partly dissolves in the matrix and partly occurs as precipitates such as Gd and Ni-rich Ni–Mn–Ga–Gd quaternary phases. At room temperature, the alloy is mainly composed of non-modulated martensite with a small amount of seven-layered and ten-layered modulated martensite. The high-resolution electron microscopy (HREM) images also reveal that some layered structures in certain zones are microtwins in nature with a thickness of a few atomic planes as the stacking sequence is not periodic.
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