The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation
The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation
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DOI：
10.1016/j.scriptamat.2017.12.014
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发表时间：
2018-03
影响因子：
6
通讯作者：
Suchandrima Das;D. Armstrong;Y. Zayachuk;W. Liu;R. Xu;F. Hofmann
中科院分区：
文献类型：
--
作者：
Suchandrima Das;D. Armstrong;Y. Zayachuk;W. Liu;R. Xu;F. Hofmann
通过比较钨单晶未注入区和注入区的球形纳米压痕，研究了氦注入引起的缺陷对变形行为的影响。氦离子注入增加了硬度，导致大量堆积。3D分辨X射线微衍射独特地允许检查特定压痕下的复杂晶格畸变。在离子注入材料中，我们发现减少晶格旋转和残余应变由于压痕，表明一个更有限的塑性区。总之，我们的观察表明，氦诱导的缺陷最初作为有效的障碍位错运动，但被削弱了随后通过的位错，导致加工硬化能力的降低。
The effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction uniquely allows examination of the complex lattice distortions beneath specific indents. In the ion-implanted material we find reduced lattice rotations and residual strains due to indentation, indicating a more confined plastic zone. Together, our observations suggest that helium-induced defects initially act as efficient obstacles to dislocation motion, but are weakened by the subsequent passage of dislocations, causing a reduction in work hardening capacity.