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Reduced hardening of nanocrystalline nickel under multiaxial indentation loading

机译：多轴压痕载荷下纳米晶镍的硬化减少

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摘要

The work hardening behavior of electrodeposited nanocrystalline nickel (29 and 19 nm) was investigated under multiaxial loading and compared with coarse-grained nickel. Plastic strain gradients were introduced into the materials using large Rockwell D hardness indentations, and measured through cross-sectional hardness profiles. The results showed that the coarse-grained material exhibited substantial hardening up to twice the hardness of the deformation-free area due to dislocation mediated deformation, while the nanocrystalline materials displayed small hardness variations along the strain gradient, indicative of considerably reduced dislocation interactions. Moreover, the grain structure analysis (cumulative volume fraction and size distribution) for the nanocrystalline materials suggested the operation of both dislocation mediated and grain boundary controlled deformation mechanisms, the latter becoming more significant with increasing cumulative sample volume of very small grains. The plastic deformation zone sizes under Rockwell indentation of the 29 nm Ni are similar to those conventional materials with reduced strain hardening. Microhardness-indentation size effects were negligible in both the nanocrystalline and coarse-grained materials.
机译：研究了电沉积纳米晶镍（29和19 nm）在多轴载荷下的加工硬化行为，并将其与粗晶镍进行了比较。使用大的Rockwell D硬度压痕将塑性应变梯度引入材料中，并通过横截面硬度曲线进行测量。结果表明，由于位错介导的形变，粗晶粒材料表现出相当高的硬度，达到无变形区硬度的两倍，而纳米晶材料沿应变梯度显示出较小的硬度变化，表明位错相互作用大大降低。此外，对纳米晶体材料的晶粒结构分析（累积体积分数和尺寸分布）表明，位错介导的和晶界控制的变形机制均起作用，后者随着非常小的晶粒的累积样品体积的增加而变得更加重要。在29 nm Ni的Rockwell压痕作用下的塑性变形区尺寸类似于那些应变硬化降低的常规材料。在纳米晶体和粗晶粒材料中，显微硬度压痕尺寸的影响都可以忽略不计。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3528-3541|共14页
  • 作者

    Bill T.F. Tang; Yijian Zhou; Thomas Zabev; Iain Brooks; Uwe Erb;

  • 作者单位

    Department of Material Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada;

    Department of Material Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada;

    Department of Material Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada;

    Integran Technologies Inc., Mississauga, Ontario LAV 1H7, Canada;

    Department of Material Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada;

  • 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
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