4.4 Article

Yield stress influenced by the ratio of wire diameter to grain size - a competition between the effects of specimen microstructure and dimension in micro-sized polycrystalline copper wires

期刊

PHILOSOPHICAL MAGAZINE
卷 92, 期 25-27, 页码 3243-3256

出版社

TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.693215

关键词

size effect; copper; tensile testing; Hall-Petch behavior; micromechanics

资金

  1. K2 Competence Centre

向作者/读者索取更多资源

Polycrystalline copper wires with diameters of 25, 30 and 50 mm were annealed at temperatures between 200 degrees C and 900 degrees C, resulting in different microstructures with ratios of wire diameter to grain size between 1.1 and 15.6. The microstructure evolution and tensile behavior were studied systematically. In comparison with experimental data available in the literature, the results revealed that the tensile yield stresses of these micro-sized wires are influenced not only by the grain size but also by the ratio of wire diameter to grain size. This is clearly seen when comparing identical grain sizes but different wire diameters where thinner wires reveal smaller flow stress values. A model is proposed to explain the 'smaller is softer' phenomenon, taking into account the higher strengthening effect of grain boundaries compared to the free surface.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据