期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 527, 期 15, 页码 3472-3479出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.02.016
关键词
Aluminium alloys; High pressure torsion; Geometrically necessary dislocations; Cold work; Clusters
类别
资金
- EPRSC [EP/D00313X/1]
- China Scholarship Council (CSC)
- Engineering and Physical Sciences Research Council [EP/D00313X/1] Funding Source: researchfish
- EPSRC [EP/D00313X/1] Funding Source: UKRI
The influence of alloying additions on strengthening of high pressure torsion (HPT) processed alloys was investigated using commercially pure Al (Al-1050 alloy) and five Al-(1-3)Mg-(0-4)Cu alloys (in wt%). Microhardness was measured on cross-sections. For Al-1050 the microhardness reaches a peak at an effective strain of about three and subsequently decreases. The microhardness of Al-Mg-Cu alloys increases strongly and continuously with increasing equivalent strain. This workhardening rate is enhanced by increasing Mg content over the entire range of strain. Furthermore, the workhardening rates were higher in Cu-free and low Cu-containing (<= 0.4%) Al-Mg alloys as compared to high Cu-containing Al-Mg alloy at strains less than three. The results indicate that dislocation-solute and dislocation-cluster interactions play an important role in strengthening. (c) 2010 Elsevier B.V. All rights reserved.
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