Weakening of olivine by hydrogen implantation: Results of nano-indentation tests and some applications to planetary materials

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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Abstract

Sticking of the dust grains is a critical step in planet formation. To investigate the solar wind effect on the dust mechanical properties, we conducted hydrogen implantation experiments (using beam energies of 10 keV, 20 keV and 50 keV) on olivine single crystals and determined the elastic modulus and the hardness as a function of depth by nano-indentation tests. The near surface regions of the samples (to ∼600 nm) show a substantial decrease in both hardness (up to ∼85%) and modulus (up to ∼74%), indicating a large degree of mechanical weakening. The depth extent of the weakened region increases with implantation energy while the degree of weakening decreases with implantation energy. TEM (transmission electron microscopy) observations of the samples show that the depth where damaged region occurs increases with the implantation energy used. The results are interpreted based on the physics of ion-solid interaction during implantation. According to our results, we expect that olivine-like dust exposed to solar wind would display a similar mechanical weakening in the surface (∼ 74% reduction in elastic modulus, ∼ 85% reduction in hardness). Mechanical weakening by solar wind implantation would enhance the sticking of the dust in the disk if dust have been effectively exposed to the solar wind. The present results are also applied to interpret observations of some planetary materials.

氢植入对橄榄石的削弱:纳米压痕测试结果及行星材料的一些应用
尘粒粘连是行星形成的关键步骤。为了研究太阳风对尘埃机械特性的影响,我们在橄榄石单晶体上进行了氢植入实验(使用 10 keV、20 keV 和 50 keV 的束流能量),并通过纳米压痕测试测定了弹性模量和硬度与深度的函数关系。样品的近表面区域(至 ∼ 600 nm)的硬度(高达 ∼ 85%)和模量(高达 ∼ 74%)都出现了大幅下降,表明存在很大程度的机械削弱。削弱区域的深度范围随着植入能量的增加而增加,而削弱程度则随着植入能量的增加而降低。样品的 TEM(透射电子显微镜)观察结果表明,受损区域的深度随植入能量的增加而增加。这些结果是根据植入过程中离子与固体相互作用的物理学原理解释的。根据我们的结果,我们预计暴露在太阳风中的橄榄石类尘埃的表面也会出现类似的机械削弱(弹性模量降低 74%,硬度降低 85%)。如果尘埃有效地暴露在太阳风中,太阳风植入造成的机械削弱会增强尘埃在星盘中的粘性。本结果还可用于解释对一些行星材料的观测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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