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Phase Transformation in Orthorhombic Ti_2AlNb Alloys Under Severe Deformation

机译:严重变形下正交晶Ti_2AlNb合金的相变

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It was found that severe plastic deformation of orthorhombic alloys caused phase transformations of the displacement type and those associated with a change in the degree of long-range order, namely B2→ω(B8_2), B2→B19 and B2→β (BCC) (in the case of alloy with initial B2-phase structure) and O→B19→A20 (initial O-phase structure, Ti_2AlNb). Unlike to ordinary metals, severe plastic deformation of the titanium aluminum intermetallics leads to decreasing of the strength of the material. The B19 and A20 phases are metastable. They are absent in the equilibrium phase diagrams of the compounds under investigation. The formation of the disordered phase states with extensive sliding and having great plasticity under severe deformation makes possible to consider severe deformation as the way for increasing of plasticity of the titanium aluminides.
机译:发现正交晶合金的严重塑性变形引起位移类型的相变以及与远距离有序度的变化相关的相变,即B2→ω(B8_2),B2→B19和B2→β(BCC) (对于具有初始B2相结构的合金)和O→B19→A20(初始O相结构,Ti_2AlNb)。与普通金属不同,钛铝金属间化合物的严重塑性变形会导致材料强度降低。 B19和A20相是亚稳的。它们在所研究化合物的平衡相图中不存在。在严重变形下形成具有大的滑动并且具有大可塑性的无序相态使得可以将严重变形视为增加铝化钛的可塑性的方式。

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