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Effect of Zr+ implantation and crystal orientation on the uniaxial deformation of Zr-2.5%Nb micro-pillars: part 2, deformation of two-phase αΖr/βΝb micro-pillars
Canadian Metallurgical Quarterly ( IF 1.3 ) Pub Date : 2021-05-05 , DOI: 10.1080/00084433.2021.1922144
Md Imran Khan 1 , Sterling St Lawrence 2 , Robert J. Klassen 1
Affiliation  

ABSTRACT

The uniaxial flow stress of 1 μm diameter Zr-2.5%Nb micro-pillars containing a microstructure of mixed αZr and βNb phases was assessed in the non-implanted condition and after Zr+ implantation to simulate neutron irradiation. Zr+ implantation (ψ¯6dpa) performed at 300 °C resulted in about 20% reduction in the flow stress σ¯(ϵ=0.10) and displayed increased serrations in the σ−ϵ response. This suggests increased thermally activated recovery of the ion-induced crystallographic defect population when irradiation damage is invoked on the αβ microstructure at 300 °C compared to at 25 °C. The αβ micro-pillars that were Zr+-implanted at 300 °C also display axial cracking during compression. This cracking was not observed during compression of non-implanted αβ micro-pillars nor was it observed on αβ micro-pillars that were Zr+ implanted at 25 °C, which illustrates the role of thermal activation during Zr+ ion implantation in weakening the alloy.



中文翻译:

Zr+注入和晶体取向对Zr-2.5%Nb微柱单轴变形的影响:第2部分,两相αΖr/βΝb微柱变形

摘要

在非注入条件下和在 Zr +注入以模拟中子辐照后,评估了 1 μm 直径 Zr-2.5%Nb 微柱的单轴流应力,该微柱包含混合的 α Zr和 β Nb相的微观结构。Zr +注入(ψ¯6d一种) 在 300 °C 下进行,流动应力降低了约 20% σ¯(ε=0.10)并在 σ−ϵ 响应中显示出增加的锯齿。这表明,与 25 °C 相比,在 300 °C 下对 αβ 微结构引起辐照损伤时,离子诱导晶体缺陷群的热活化恢复增加。在 300 °C 下注入Zr +的 αβ 微柱在压缩过程中也显示出轴向裂纹。在压缩未注入的 αβ 微柱期间没有观察到这种裂纹,在 25°C 下注入Zr + 的αβ 微柱上也没有观察到这种裂纹,这说明了在 Zr +离子注入过程中热活化在削弱合金方面的作用.

更新日期:2021-05-05
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