Effect of densification rate on consolidation and properties of Al7075–B4C composite powder. (31st October 2015)

• Record Type: Journal Article
• Authors: Majzoobi, G. H.; Atrian, A.; Pipelzadeh, M. K.
• Is Part Of: Powder metallurgy. Volume 58:Number 4(2015)
• Page Start: 281
• Page End: 288
• Publication Date: 2015-10-31
• Subjects: Boron carbide (B4C) -- Al7075 powder -- Quasi-static compaction -- Dynamic compaction -- Gas gun; Powder metallurgy -- Periodicals; 671.3705
• DOI: 10.1179/1743290115Y.0000000008
• Languages: English
• ISSNs: 0032-5899

Abstract

Abstract : Hot quasi-static pressing and dynamic compaction of Al7075–B4 C composite powder are studied in this work. Micron sized Al7075 and B4 C particles were milled to obtain uniform dispersion of B4 C reinforcing phase. Samples with relative densities up to 97.5, 99 and 100% were fabricated using gas gun, drop hammer and hot quasi-statically compactions respectively. The results showed that the increase of B4 C content improved the hardness of the compacts but did not improve the compressive strength in the samples compacted by the gas gun. However, the ductility of the samples was reduced significantly. The samples compacted using the drop hammer and under hot quasi-static loading experienced ∼25 and 11% enhancement in the compressive strength respectively. The investigation indicated that the dynamic compaction using the gas gun was more successful if it is performed after quasi-static pre-compaction and under warm compaction process. It was concluded that the quasi-static pressing is the best fabrication technique to achieve the highest density, microhardness and strength.