The influence of grain size on the mechanical properties of nanocrystalline aluminium

被引：54

作者：

Bonetti, E ^{[1
]}

Pasquini, L ^{[1
]}

Sampaolesi, E ^{[1
]}

机构：

[1] IST NAZL FIS MAT,I-40127 BOLOGNA,ITALY

来源：

NANOSTRUCTURED MATERIALS | 1997年 / 9卷 / 1-8期

关键词：

D O I：

10.1016/S0965-9773(97)00137-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Uniaxial tensile tests were performed at room temperature on nanocrystalline aluminium (n-Al) prepared by mechanical attrition and cold consolidation with average grain size in the 20-40 nm range. The stress-strain curves analysis shows an enhanced tensile strength and a reduced ductility of n-Al with respect to the coarse-grained material. Anyway, the strength increase is much lower than predicted by extrapolation of the Hall-Petch relation to nanometer sized grains. Moreover, the strengthening rate (Hall Petch coefficient) is strongly reduced in comparison with coarse-grained Al. The observed behaviour is discussed in connection with microstructure evolution during mechanical attrition. (C) 1997 Acta Metallurgica Inc.

引用

页码：611 / 614

页数：4

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