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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of milling conditions on structural evolution and phase stability of [Ti(H_2) + Al + Nb] powder mixtures
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Effect of milling conditions on structural evolution and phase stability of [Ti(H_2) + Al + Nb] powder mixtures

机译：研磨条件对[Ti（H_2）+ Al + Nb]粉末混合物结构演变和相稳定性的影响

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摘要

Mechanical properties of structural intermetallics are very sensitive to chemical composition and to microstructure. Mechanical alloying is here applied to (Ti + 22Al + 23Nb) and (TiH_2 + 22Al + 23Nb) mixtures in order to tailor both chemical and microstructural homogeneity and to refine powder size, for the synthesis of high quality Ti_2AlNb-based intermetallics. Crystal structure and phase evolution during mechanical alloying were investigated by means of X-ray diffraction and Rietveld analysis. It was identified that milling of the (Ti + 22Al + 23Nb) mixture led to the formation of a bcc (Nb, Ti, Al) solid solution, which was further confirmed by TEM analysis. Replacing pure Ti with TiH_2 resulted in the formation of a bcc (Nb, Ti, Al)H_X solid solution. Prolonged milling led to the transformation of a mixture of the bcc-(Nb, Ti, Al)H_x solid solution and an fcc-TiH_2 into a fully amorphous phase. Selected area electron diffraction confirmed this finding. An EDS analysis showed that the amorphous phase was a (Ti, Nb, Al)H_x solid solution.
机译：结构金属间化合物的机械性能对化学成分和微观结构非常敏感。机械合金化适用于（Ti + 22Al + 23Nb）和（TiH_2 + 22Al + 23Nb）混合物，以调整化学和微观结构的均质性并改善粉末尺寸，从而合成高质量的Ti_2AlNb基金属互化物。通过X射线衍射和Rietveld分析研究了机械合金化过程中的晶体结构和相演变。可以确定，研磨（Ti + 22Al + 23Nb）混合物会导致形成bcc（Nb，Ti，Al）固溶体，并通过TEM分析进一步证实。用TiH_2代替纯Ti导致形成bcc（Nb，Ti，Al）H_X固溶体。长时间研磨导致bcc-（Nb，Ti，Al）H_x固溶体和fcc-TiH_2的混合物转变为完全非晶态。选定区域的电子衍射证实了这一发现。 EDS分析表明，非晶相是（Ti，Nb，Al）H_x固溶体。

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