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Microstructure evolution of TI-SN-NB alloy prepared by mechanical alloying

机译:机械合金化制备TI-SN-NB合金的组织演变

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摘要

In the present study, Ti-16Sn-4Nb alloy was prepared by mechanical alloying (MA). Optical microscopy, scanning electron microscopy combined with energy dispersive X-ray analysis (SEM-EDX), and X-ray diffraction analysis (XRD) were used to characterise the phase transformation and the microstructure evolution. Results indicated that ball milling to 8 h led to the formation of a supersaturated hcp α-Ti and partial amorphous phase due to the solid solution of Sn and Nb into Ti lattice. The microstructure of the bulk sintered Ti-16Sn-4Nb alloy samples made from the powders at shorter ball milling times, i.e. 20 min- 2 h, exhibited a primary α surrounded by a Widmanstätten structure (transformed β); while in the samples made from the powders at longer ball milling times, i.e. 5- 10 h, the alloy evolved to a microstructure with a disordered and fine β phase dispersed homogeneously within the α matrix. These results contribute to the understanding of the microstructure evolution in alloys of this type prepared by powder metallurgy.
机译:在本研究中,通过机械合金化(MA)制备Ti-16Sn-4Nb合金。使用光学显微镜,扫描电子显微镜结合能量色散X射线分析(SEM-EDX)和X射线衍射分析(XRD)表征相变和微观结构的演变。结果表明,球磨至8 h,由于Sn和Nb固溶在Ti晶格中,导致形成过饱和hcpα-Ti和部分非晶相。在较短的球磨时间(即20分钟至2小时)下,由粉末制成的块状烧结Ti-16Sn-4Nb合金样品的显微组织显示出一个由Widmanstätten结构(转变为β)包围的初生α。而在较长的球磨时间(即5-10小时)中,由粉末制成的样品中,合金演变成具有无序且细小的β相均匀分布在α基体中的微观结构。这些结果有助于理解通过粉末冶金制备的这种类型的合金的微观结构演变。

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