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Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics.

Zhang J, Lu T, Chang X, Wei N, Qi J - Nanoscale Res Lett (2013)

Bottom Line: These tests were carried out on samples at different applied loads ranging from 300 to 9,000 μN.The elastic recovery for nanostructured transparent MgAl2O4 ceramics at different applied loads was derived from the force-depth data.Finally, the experimentally measured hardness and Young's modulus, as derived from the load-displacement data, are as high as 31.7 and 314 GPa, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China. zhjie126@126.com.

ABSTRACT
Nanoindentation tests were performed on nanostructured transparent magnesium aluminate (MgAl2O4) ceramics to determine their mechanical properties. These tests were carried out on samples at different applied loads ranging from 300 to 9,000 μN. The elastic recovery for nanostructured transparent MgAl2O4 ceramics at different applied loads was derived from the force-depth data. The results reveal a remarkable enhancement in plastic deformation as the applied load increases from 300 to 9,000 μN. After the nanoindetation tests, scanning probe microscope images show no cracking in nanostructured transparent MgAl2O4 ceramics, which confirms the absence of any cracks and fractures around the indentation. Interestingly, the flow of the material along the edges of indent impressions is clearly presented, which is attributed to the dislocation introduced. High-resolution transmission electron microscopy observation indicates the presence of dislocations along the grain boundary, suggesting that the generation and interaction of dislocations play an important role in the plastic deformation of nanostructured transparent ceramics. Finally, the experimentally measured hardness and Young's modulus, as derived from the load-displacement data, are as high as 31.7 and 314 GPa, respectively.

No MeSH data available.


Related in: MedlinePlus

Typical load-depth curve obtained from nanoindentation,Pmax = 3,250 μN. Inset shows the elastic recovery (hmax − hf) as a function of applied load.
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Figure 1: Typical load-depth curve obtained from nanoindentation,Pmax = 3,250 μN. Inset shows the elastic recovery (hmax − hf) as a function of applied load.

Mentions: Figure 1 shows a typical load-depth curve obtained through nanoindentation in the present study. The inset shows the difference between the total indentation depth at a maximum indented load (hmax) and depth of residual impression upon unloading (hf), i.e., the elasticity recovery hmax − hf. Following the nanoindentation load-depth data, the H and Er were determined [17]; these quantities can be derived using the following relations:


Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics.

Zhang J, Lu T, Chang X, Wei N, Qi J - Nanoscale Res Lett (2013)

Typical load-depth curve obtained from nanoindentation,Pmax = 3,250 μN. Inset shows the elastic recovery (hmax − hf) as a function of applied load.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3672023&req=5

Figure 1: Typical load-depth curve obtained from nanoindentation,Pmax = 3,250 μN. Inset shows the elastic recovery (hmax − hf) as a function of applied load.
Mentions: Figure 1 shows a typical load-depth curve obtained through nanoindentation in the present study. The inset shows the difference between the total indentation depth at a maximum indented load (hmax) and depth of residual impression upon unloading (hf), i.e., the elasticity recovery hmax − hf. Following the nanoindentation load-depth data, the H and Er were determined [17]; these quantities can be derived using the following relations:

Bottom Line: These tests were carried out on samples at different applied loads ranging from 300 to 9,000 μN.The elastic recovery for nanostructured transparent MgAl2O4 ceramics at different applied loads was derived from the force-depth data.Finally, the experimentally measured hardness and Young's modulus, as derived from the load-displacement data, are as high as 31.7 and 314 GPa, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China. zhjie126@126.com.

ABSTRACT
Nanoindentation tests were performed on nanostructured transparent magnesium aluminate (MgAl2O4) ceramics to determine their mechanical properties. These tests were carried out on samples at different applied loads ranging from 300 to 9,000 μN. The elastic recovery for nanostructured transparent MgAl2O4 ceramics at different applied loads was derived from the force-depth data. The results reveal a remarkable enhancement in plastic deformation as the applied load increases from 300 to 9,000 μN. After the nanoindetation tests, scanning probe microscope images show no cracking in nanostructured transparent MgAl2O4 ceramics, which confirms the absence of any cracks and fractures around the indentation. Interestingly, the flow of the material along the edges of indent impressions is clearly presented, which is attributed to the dislocation introduced. High-resolution transmission electron microscopy observation indicates the presence of dislocations along the grain boundary, suggesting that the generation and interaction of dislocations play an important role in the plastic deformation of nanostructured transparent ceramics. Finally, the experimentally measured hardness and Young's modulus, as derived from the load-displacement data, are as high as 31.7 and 314 GPa, respectively.

No MeSH data available.


Related in: MedlinePlus