期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 585, 期 -, 页码 795-799出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.09.116
关键词
Nanostructured materials; Metals and alloys; High energy ball milling; High-pressure compaction; Mechanical properties; Strain rate sensitivity
资金
- Department of Science and Technology, Government of India
Nanocrystalline aluminium powder synthesized using high energy ball milling process was characterized by X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). The studies indicated the powder having an average grain size of similar to 42 nm. The consolidation of the powder was carried out by high-pressure compaction using a uni-axial press at room temperature by applying a pressure of 1.5 GPa. The cold compacted bulk sample having a density of similar to 98% was subjected to nanoindentation which showed an average hardness and elastic modulus values of 1.67 +/- 0.09 GPa and 83 +/- 8 GPa respectively at a peak force of 8000 mu N and a strain rate of 10(-2) s(-1). Achieving good strength along with good ductility is challenging in nanocrystalline metals. When enough sample sizes are not available to measure ductility and other mechanical properties as per ASTM standards, as is the case with nanocrystalline materials, nanoindentation is a very promising technique to evaluate strain rate sensitivity. Strain rate sensitivity is a good measure of ductility and in the present work it is measured by performing indentation at various loads with varying loading rates. Strain rate sensitivity values of 0.024-0.054 are obtained for nanocrystalline Al which are high over conventional coarse grained Al. In addition, Scanning Probe Microscopy (SPM) image of the indent shows that there is some plastically flown region around the indent suggesting that this nanocrystalline aluminium is ductile. (C) 2013 Elsevier B. V. All rights reserved.
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。
推荐
暂无数据