Investigation on surface/subsurface deformation mechanism and mechanical properties of GGG single crystal induced by nanoindentation

Li Chen; Zhang Feihu; Wang Xin; Rao Xiaoshuang

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Investigation on surface/subsurface deformation mechanism and mechanical properties of GGG single crystal induced by nanoindentation

机译：纳米茚诱导GGG单晶表面/地下变形机理及力学性能研究

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In this paper, nanoindentation tests of GGG single crystal are performed on an Agilent G200 nanoindenter. The surface morphology and subsurface deformation mechanism induced by the nanoindentation are analyzed by a scanning electron microscope and a transmission electron microscope (TEM), respectively. The ductile deformation mechanism of GGG single crystal induced by the nanoindentation is a combination of "polycrystalline nano-crystallites" and "amorphous transformation." In addition, the relationships between the normal force and elastic recovery, microhardness, elastic modulus, and fracture toughness of GGG single crystal are researched. Due to the size effect caused by the tip radius of the indenter, the elastic recovery rate and fracture toughness decrease first and then tend to be stable as the normal force increases, while the microhardness and elastic modulus increase first and then decrease to be stable as the normal force increases. The stress-strain curve of GGG single crystal is developed by using the nanoindentation test with a spherical indenter. When GGG single crystal deforms from the elastic regime into the ductile regime, the original single crystal is changed into "polycrystalline nanocrystallites" and "amorphous transformation" structures verified by TEM. Therefore, the material strength decreases, which results in a discontinuity of the stress-strain curve for GGG single crystal. (C) 2018 Optical Society of America.

机译：在本文中，在Agilent G200纳米茚上的纳米茚上进入纳米茚基进行GGG单晶的纳米indentation试验。通过扫描电子显微镜和透射电子显微镜（TEM）分析由纳米indentation诱导的表面形态和地下变形机制。通过纳米茚诱导的GGG单晶的延性变形机制是“多晶纳米微晶”和“无定形转移”的组合。此外，研究了GGG单晶的正常力和弹性回收，微硬度，弹性模量和裂缝韧性之间的关系。由于压痕尖端半径引起的尺寸效应，弹性回收率和断裂韧性首先降低，然后随着法向力的增加而稳定，而微硬度和弹性模量首先增加，然后减少稳定正常力增加。通过使用具有球形压头的纳米压扇测试来开发GGG单晶的应力 - 应变曲线。当GGG单晶从弹性调节变形到延展状态下时，原始单晶被TEM验证的“多晶纳米晶体”和“非晶转化”结构。因此，材料强度降低，这导致GGG单晶的应力 - 应变曲线的不连续性。（c）2018年光学学会。

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来源
《Applied optics》 |2018年第14期|共8页
作者
Li Chen; Zhang Feihu; Wang Xin; Rao Xiaoshuang;
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Harbin Inst Technol State Key Lab Robot &

Syst HIT Harbin 150001 Heilongjiang Peoples R China;

Harbin Inst Technol State Key Lab Robot &

Syst HIT Harbin 150001 Heilongjiang Peoples R China;

Harbin Inst Technol State Key Lab Robot &

Syst HIT Harbin 150001 Heilongjiang Peoples R China;

Harbin Inst Technol State Key Lab Robot &

Syst HIT Harbin 150001 Heilongjiang Peoples R China;

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Investigation on surface/subsurface deformation mechanism and mechanical properties of GGG single crystal induced by nanoindentation

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