期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.01.053
关键词
Aluminum; Scandium; Powder metallurgy; Spark plasma sintering; Microstructure; Tensile properties
类别
资金
- Boeing Research and Technology [11-6392]
- Natural Sciences and Engineering Research Council of Canada (NSERC) (collaborative research and development) [451466]
- GKN Sinter Metals
The objective of this research was to commence work on the spark plasma sintering (SPS) of Al-Sc alloys in an effort to develop fundamental data in this area. In this precursory study, a series of binary systems containing 0.1 to 0.4 wt% Sc were processed in laboratory and industrial-scale equipment. Data revealed that all powders were responsive to SPS in both scenarios and that sintering temperature was a variable of critical importance. Hardness of as-sintered products scaled directly with Sc concentration but varied inversely with SPS temperature owing to in-situ aging of the raw powders. Hardness losses could be recovered through a post-SPS heat treatment into the T6 condition. Industrially processed slugs of Al-0.4Sc-T6 exhibited full densification and offered the highest hardness (786+/-8 MPa). This was accompanied by a nominal tensile yield strength of 197 MPa, UTS of 226 MPa and tensile ductility of 11%. (C) 2016 Elsevier B.V. All rights reserved.
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