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Microstructure and texture in cryomilled and spark plasma sintered Ti Grade 2

机译:冷冻和火花等离子体烧结Ti级的微观结构和质地

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摘要

Titanium (Grade 2) was processed by cryogenic milling and subsequently sintered by spark plasma sintering (SPS) method with the aim of creating and preserving the ultra-fine grained (UFG, < 1 μm) microstructure. Microstructural investigation was performed after both cryogenic milling and spark plasma sintering. An advanced technique of transmission Kikuchi diffraction (TKD) was used to characterize the individual milled powder particles.Investigations of milled powders showed significant grain refinement down to 50 nm after milling in liquid argon with tungsten carbide balls. We assume that this is the equilibrium grain size resulting from the balance of deformation, recovery and dynamic recrystallization. A texture, resembling the rolling texture in Ti, was also found in the milled particles, which can be explained by the nature of deformation during milling.UFG microstructure was not maintained after sintering, with the mean grain size of 2.6 μm. Although the grains are completely recrystallized, a texture, similar to the powder texture, was also found in these samples as a result of packing of the powder particles and the nature of the recrystallization process (continuous static recrystallization).
机译:通过低温研磨加工钛(级),随后通过火花等离子体烧结(SPS)方法烧结,目的是产生和保留超细颗粒(UFG,<1μm)微观结构。在低温研磨和火花等离子体烧结后进行微观结构研究。使用钨渣磨削后磨粉粉末粉末粉末粉粉颗粒的速度较高的衍射kikuchi衍射(Tkd)进行表征。我们假设这是由变形,回收率和动态重结晶的平衡导致的平衡晶粒尺寸。在碾磨的颗粒中也发现了类似于Ti的滚动纹理的纹理,这可以通过铣削期间的变形性质来解释。烧结后,均匀的微观结构未保持,平均晶粒尺寸为2.6μm。虽然晶粒完全重结晶,但由于粉末颗粒包装和再结晶过程的性质(连续静态再结晶),在这些样品中也发现了类似于粉末质地的质地。

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