This paper focuses on the processes of the occurrence of magnetization during structure formation in samples of Ni₅₁Ti₄₉ alloy under deformation conditions. The possibility of the existence of a phase with an FCC (face-centered cubic) lattice in titanium nickelide has been demonstrated by electron microscopy and electron diffraction. It has been discovered that the interplanar distances of BCC₁₁₀ (body-centered cubic), FCC₁₁₁, and HCP₀₀₂ (hexagonal close packed) in the alloy under study have similar values, which indicates the possibility of their mutual polymorphic transformation. Based on the modular self-organization, a scheme of martensitic transformations in titanium nickelide from the B2 structure (BCC lattice) to the B19’ structure (HCP lattice) through an intermediate phase with an FCC lattice is proposed. It is shown that lenticular crystals appear in the Ni₅₁Ti₄₉ alloy under tensile deformation until rupture, which is accompanied by the onset of ferromagnetism. The effect of magnetization in Ni₅₁Ti₄₉ samples when immersed in liquid nitrogen has been also discovered. In this case, the reason for the appearance and disappearance of magnetization can be associated with microdeformation processes caused by direct and reverse martensitic transitions that occur during cooling and heating of the samples.

中文翻译：

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塑性变形和弹性变形下镍钛合金马氏体相变过程中的磁性

本文着重研究了在变形条件下Ni ₅₁ Ti ₄₉合金样品在组织形成过程中发生磁化的过程。电子显微镜和电子衍射已证明在镍化钛中存在具有FCC（面心立方）晶格的相的可能性。已经发现BCC ₁₁₀（体心立方），FCC ₁₁₁和HCP ₀₀₂的平面间距所研究合金中的（六方密堆积）具有相似的值，这表明它们相互多晶型转变的可能性。基于模态自组织，提出了一种镍钛合金通过具有FCC晶格的中间相从B2结构（BCC晶格）到B19'结构（HCP晶格）的马氏体转变的方案。结果表明，Ni ₅₁ Ti ₄₉合金在拉伸变形直至断裂之前会出现柱状晶体，并伴随着铁磁性的产生。Ni ₅₁ Ti _49中的磁化效应还发现了将样品浸入液氮中时的情况。在这种情况下，磁化出现和消失的原因可能与在样品冷却和加热过程中发生的直接和反向马氏体转变所引起的微变形过程有关。