4.7 Article

Evidence for a High Temperature Whisker Growth Mechanism Active in Tungsten during In Situ Nanopillar Compression

Journal

NANOMATERIALS
Volume 11, Issue 9, Pages -

Publisher

MDPI
DOI: 10.3390/nano11092429

Keywords

tungsten; fuzz; whisker; in situ; transmission electron microscopy

Funding

  1. US DOE Office of Basic Energy Sciences, Materials Science and Engineering Division [DE-SC0019875]
  2. DOE-BES Materials Science and Engineering Division [FWP 15013170]
  3. U.S. DOE's National Nuclear Security Administration [DE-NA-0003525]
  4. U.S. Department of Energy (DOE) [DE-SC0019875] Funding Source: U.S. Department of Energy (DOE)

Ask authors/readers for more resources

In a series of nanopillar compression tests on tungsten, the effects of surface oxidation on deformation were studied using in situ heating, revealing a mechanism for localized plasticity. The results suggest that the constraint imposed by surface oxidation may lead to the growth of whiskers, similar to the whisker growth mechanism. The study also discussed the similarities between the tungsten fuzz growth mechanism and whisker growth in different conditions.
A series of nanopillar compression tests were performed on tungsten as a function of temperature using in situ transmission electron microscopy with localized laser heating. Surface oxidation was observed to form on the pillars and grow in thickness with increasing temperature. Deformation between 850 degrees C and 1120 degrees C is facilitated by long-range diffusional transport from the tungsten pillar onto adjacent regions of the Y2O3-stabilized ZrO2 indenter. The constraint imposed by the surface oxidation is hypothesized to underly this mechanism for localized plasticity, which is generally the so-called whisker growth mechanism. The results are discussed in context of the tungsten fuzz growth mechanism in He plasma-facing environments. The two processes exhibit similar morphological features and the conditions under which fuzz evolves appear to satisfy the conditions necessary to induce whisker growth.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available