Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics

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	Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics
	J. Zhang; T. C. Lu; X. H. Chang; N. Wei; J. Q. Qi
	2013
发表期刊	Nanoscale Research Letters
ISSN	1931-7573
卷号	8
摘要	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 mu N. 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 mu N. 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.
部门归属	[zhang, jie] ludong univ, sch phys & optoelect engn, yantai 264025, peoples r china. [lu, tiecheng ; wei, nian ; qi, jianqi] sichuan univ, dept phys, chengdu 610064, peoples r china. [lu, tiecheng ; wei, nian ; qi, jianqi] sichuan univ, key lab radiat phys & technol, minist educ, chengdu 610064, peoples r china. [lu, tiecheng] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china. [chang, xianghui] southwest jiaotong univ, coll phys sci & technol, chengdu 610031, peoples r china. ; zhang, j (reprint author), ludong univ, sch phys & optoelect engn, yantai 264025, peoples r china. ; zhjie126@126.com ; lutiecheng@scu.edu.cn
关键词	Nanostructured Transparent Ceramic Nanoindentation Hardness Elastic Modulus Nanoindentation Temperature Load
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71679
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Zhang,T. C. Lu,X. H. Chang,et al. Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics[J]. Nanoscale Research Letters,2013,8.
APA	J. Zhang,T. C. Lu,X. H. Chang,N. Wei,&J. Q. Qi.(2013).Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics.Nanoscale Research Letters,8.
MLA	J. Zhang,et al."Unique mechanical properties of nanostructured transparent MgAl2O4 ceramics".Nanoscale Research Letters 8(2013).