Grain size dependence of mechanical properties in nanocrystalline selenium

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	Grain size dependence of mechanical properties in nanocrystalline selenium
	K. Lu; H. Y. Zhang; Y. Zhong; H. J. Fecht
	1997
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	12 期号:4 页码:923-930
摘要	Porosity-free nanocrystalline element selenium (nc-Se) samples with the mean grain sizes ranging from 8 to 70 nm were: synthesized by complete crystallization of the melt-quenched amorphous Se solid. Mechanical properties including microhardness (H-nu) and elastic modulus (E) of the nc-Se samples were measured by means of nanoindentation tests and microhardness tests, respectively. With a reduction of grain size, the nc-Se samples were found to be substantially hardened. But the grain size dependence of H-nu does not follow a simple Hall-Fetch relation over the whole grain size range, exhibiting three distinct stages corresponding to three different Hall-Fetch slopes. The maximum Hall-Fetch slope was found to be in the grain size range of 15-20 nm, corresponding to large values of the: elastic modulus. This behavior can be explained in terms of the lattice distortion in the nc-Se samples that was experimentally determined by using quantitative x-ray diffraction measurements. A conclusion is drawn that the lattice structure of the nm-sized crystallites may play an important role in mechanical properties of nanocrystalline materials.
部门归属	tech univ berlin, inst met res, d-10623 berlin, germany.;lu, k (reprint author), acad sinica, inst met res, state key lab rsa, shenyang 110015, peoples r china
关键词	Hall-petch Relationship Behavior Alloys Cu Ni Pd
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38042
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Lu,H. Y. Zhang,Y. Zhong,et al. Grain size dependence of mechanical properties in nanocrystalline selenium[J]. Journal of Materials Research,1997,12(4):923-930.
APA	K. Lu,H. Y. Zhang,Y. Zhong,&H. J. Fecht.(1997).Grain size dependence of mechanical properties in nanocrystalline selenium.Journal of Materials Research,12(4),923-930.
MLA	K. Lu,et al."Grain size dependence of mechanical properties in nanocrystalline selenium".Journal of Materials Research 12.4(1997):923-930.