期刊
ACTA MATERIALIA
卷 60, 期 16, 页码 5850-5857出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.07.026
关键词
Diamantane; Cryomilling; Nanoscale softening; Hall-Petch relation; Mechanical behavior
资金
- National Science Foundation [DMR-0702978]
- UC
- Boeing Company [GCP07-10250]
The mechanical behavior of bulk cryomilled aluminum stabilized by diamantane nanoparticles is compared with that of bulk cryomilled commercial purity (CP) aluminum with no diamantane. Bulk cryomilled aluminum was prepared by consolidating the cryomilled aluminum powders via hot isostatic pressing followed by trap extrusion (high strain extrusion) at room temperature. The results revealed that, while the grain size of cryomilled CP aluminum (155 nm) was larger than that of cryomilled aluminum containing diamantane (68-95 nm), the strength of the former is higher than of the latter. This finding is explained in terms of the occurrence of nanoscale softening, which signifies a transition from conventional Hall-Petch behavior (strengthening with decreasing grain size) to inverse Hall-Petch behavior (softening with decreasing grain size). (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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