Immiscible nanostructured copper-aluminum-niobium alloy with excellent precipitation strengthening upon friction stir processing and aging

SCRIPTA MATERIALIA

卷:164

Article

Sinha, Subhasis¹  Komarasamy, Mageshwari¹  Thapliyal, Saket¹  Gwalani, Bharat¹  Shukla, Shivakant¹  Darling, Kristopher A.²  Mishra, Rajiv S.¹ 

[1] Univ North Texas, Adv Mat & Mfg Proc Inst, Dept Mat Sci & Engn, Ctr Frict Stir Proc, Denton, TX 76207 USA

[2] US Army, Res Lab, Weap & Mat Res Directorate, Aberdeen Proving Ground, MD 27005 USA

关键词: Friction stir processing;    Copper alloys;    Nanocrystalline microstructure;    Precipitation;    Hardness;   

DOI  :  10.1016/j.scriptamat.2019.01.038

来源: Elsevier

【 摘 要 】

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 similar to 43 +/- 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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