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Structural changes and thermal expansion behavior of ultrafine titanium powders during compaction and heating

机译:超细钛粉在压制和加热过程中的结构变化和热膨胀行为

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摘要

This work represents an attempt to understand the nature of micron and attrition milled nano-sized titanium powders on two different aspects, i.e., pressure-induced phase change and thermal expansion. Contraction in the volume of unit cell in terms of decrease in interplaner spacing (d) has been observed in both powders and tends to restore upon annealing. At a given pressure, nano titanium shows a smaller decrease in d relative to micron titanium. The stress analysis of the compacts indicates higher value of residual stresses and deformations in micron powder than in nano powder. The dilatometric study reveals, first, the release of internal stresses and entrapped gases causes huge expansion in nanopowder compacts during heating. Secondly, there is no significant difference in the expansion coefficients of sintered micro- and nanocrystalline titanium samples.
机译:这项工作代表了试图从两个不同的方面(即压力引起的相变和热膨胀)了解微米和磨损磨碎的纳米级钛粉的性质。在两种粉末中均观察到晶格体积的收缩,即晶面间距(d)的减小,并且在退火时趋于恢复。在给定压力下,相对于微米钛,纳米钛的d减小较小。压坯的应力分析表明,与纳米粉末相比,微米粉末中的残余应力和变形值更高。膨胀计研究表明,首先,内部应力和截留气体的释放导致加热过程中纳米粉体的巨大膨胀。其次,烧结的微晶和纳米晶钛样品的膨胀系数没有显着差异。

著录项

  • 来源
    《Journal of Materials Research》 |2005年第3期|p.580-585|共6页
  • 作者

    B.B. Panigrahi; M.M. Godkhindi;

  • 作者单位

    Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302 India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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