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首页> 外文期刊>Journal of Materials Research >Size effects in LiF micron-scale single crystals of low dislocation density
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Size effects in LiF micron-scale single crystals of low dislocation density

机译：低位错密度的LiF微米级单晶的尺寸效应

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This study examines the size-dependent deformation response of pure LiF single crystals using microcompression testing. Microcrystals with an (001) orientation and sample diameter D ranging from 1 to 20 μm were fabricated by focused ion beam (FIB)-milling from bulk crystals having a low initial dislocation density. Both as-grown and γ-irradiated crystals were examined to characterize the effect of an increased point defect density on the size-affected plastic flow response. Similar to previously studied face-centered cubic (FCC)-derivative metals, both types of LiF microcrystals exhibit typical size-dependent plastic flow behavior: a dramatic size-dependent and statistically varying flow stress, atypically high strain hardening rates at small plastic strains, and fast intermittent strain bursts. The size-dependent strengthening obeys a power law, σ ～ D~(-m), where m ≈ 0.8, and this rapid hardening results in engineering flow stresses of 650 MPa in l-|xm samples. The findings are evaluated against possible dislocation mechanisms that could be responsible for the observed size effects.
机译：这项研究使用微压缩测试检查了纯LiF单晶的尺寸依赖性变形响应。通过聚焦离子束（FIB）研磨，从初始位错密度低的块状晶体中制备出（001）取向且样品直径D为1至20μm的微晶。研究了生长中的晶体和γ辐射的晶体，以表征点缺陷密度增加对受尺寸影响的塑性流动响应的影响。与先前研究的面心立方（FCC）衍生物金属相似，两种类型的LiF微晶均表现出典型的尺寸依赖性塑性流动行为：尺寸依赖性显着且统计上变化的流动应力，在较小的塑性应变下具有非典型的高应变硬化速率，和快速的间歇应变爆发。尺寸相关的强化遵循幂定律σ〜D〜（-m），其中m≈0.8，这种快速硬化导致l- | xm样品中的工程流应力为650 MPa。针对可能导致观察到的尺寸效应的位错机制对发现进行了评估。

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