SIZE EFFECTS ON THE STRENGTH OF METALS

doi:10.3724/SP.J.1037.2014.00016

Acta Metall Sin

2014, Vol. 50

Issue (2): 137-140 DOI: 10.3724/SP.J.1037.2014.00016

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SIZE EFFECTS ON THE STRENGTH OF METALS

HUANG Xiaoxu(

)

Danish-Chinese Center for Nanometals, Department of Wind Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark

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HUANG Xiaoxu. SIZE EFFECTS ON THE STRENGTH OF METALS. Acta Metall Sin, 2014, 50(2): 137-140.

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Abstract

The grain size effect and the specimen size effect on the strength of metals are briefly reviewed with respect to their history and current status of research. It is revealed that the fundamental strengthening mechanisms responsible for these two types of size effect are to increase the resistance to dislocation motion and to dislocation generation, respectively. It is shown that both strengthening mechanisms take place in some nanostructured metals, which leads to a suggestion to use these two mechanisms for optimizing the strength and ductility of nanostructured metals. This suggestion is verified by some results obtained in nanostructured pure aluminum.

Key words: strength of metal grain size effect specimen size effect nanostructured metal strengthening mechanism

Received: 08 January 2014

ZTFLH:	TG111.2
	TG113.25

Fund: Supported by Danish National Research Foundation (No.DNRF86-5) and National Natural Science Foundation of China ( No.51261130091)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2014.00016 OR https://www.ams.org.cn/EN/Y2014/V50/I2/137

Fig.1

高纯Al (99.99%)的屈服强度σ_0.2 与平均晶粒尺寸d_R 的关系曲线^[10]

Fig.2

纳米结构纯Al (99.2%)的组织形貌和位错组态^[21,22]

Fig.3

纳米结构纯Al的工程应力-应变曲线^[23]

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