Grain size determination and limits to Hall-Petch behavior in nanocrystalline NiAl powders

被引：73

作者：

Volpp, T ^{[1
]}

Goring, E ^{[1
]}

Kuschke, WM ^{[1
]}

Arzt, E ^{[1
]}

机构：

[1] Max Planck Inst Met Forsch, D-70174 Stuttgart, Germany

来源：

NANOSTRUCTURED MATERIALS | 1997年 / 8卷 / 07期

关键词：

D O I：

10.1016/S0965-9773(98)00019-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline NiAl powder with grain sizes in the range 7 to 80 nm was produced by mechanical alloying, followed in some cases by heat treatment. Microhardness and nanoindenter measurements as well as characterization by X-ray and TEM methods were carried out. It is found that, depending on the thermal history, the material exhibits "inverse Hall-Fetch behavior" for grain sizes below 20 nm or a hardness increase until saturation at 7 nm. The grain sizes determined by TEM correspond closely to the coherence length measured by X-ray peak broadening. The results, including rms strains, are discussed in the light of existing theories. (C) 1998 Acta Metallurgica Inc.

引用

页码：855 / 865

页数：11

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