Immiscible nanostructured copper-aluminum-niobium alloy with excellent precipitation strengthening upon friction stir processing and aging. (15th April 2019)

• Record Type: Journal Article
• Authors: Sinha, Subhasis; Komarasamy, Mageshwari; Thapliyal, Saket; Gwalani, Bharat; Shukla, Shivakant; Darling, Kristopher A.; Mishra, Rajiv S.
• Is Part Of: Scripta materialia. Number 164(2019)
• Page Start: 42
• Page End: 47
• Publication Date: 2019-04-15
• Subjects: Friction stir processing -- Copper alloys -- Nanocrystalline microstructure -- Precipitation -- Hardness; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.01.038
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A ternary immiscible nanostructured Cu-Al-Nb alloy was fabricated by friction stir processing of mechanically compacted pellets. Subsequently, aging was carried out at 563 K for various times. The material exhibited hardness of ~4.3 ± 0.1 GPa in the peak-aged condition (aging for 6 h), which is remarkable among Cu-based ternary immiscible alloys. The excellent strength of the material is attributed to Hall-Petch strengthening due to the extremely refined nanocrystalline structure, coupled with precipitation strengthening due to a uniform distribution of nano-scale Al- and Nb-rich precipitates or clusters, as confirmed by X-ray diffraction and microstructural characterization. Graphical abstract: Unlabelled Image