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

Subhasis Sinha; Mageshwari Komarasamy; Saket Thapliyal; Bharat Gwalani; Shivakant Shukla; Kristopher A. Darling; Rajiv S. Mishra

doi:10.1016/j.scriptamat.2019.01.038

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

Subhasis Sinha, Mageshwari Komarasamy, Saket Thapliyal, Bharat Gwalani, Shivakant Shukla, Kristopher A. Darling, Rajiv S. Mishra

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

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.

Original language	English
Pages (from-to)	42-47
Number of pages	6
Journal	Scripta Materialia
Volume	164
DOIs	https://doi.org/10.1016/j.scriptamat.2019.01.038
State	Published - Apr 15 2019
Externally published	Yes

Funding

The work was performed under a cooperative agreement between the Army Research Laboratory and the University of North Texas (W911NF-13-2-0018). Materials Research Facility (MRF) at University of North Texas is acknowledged for providing access to the microscopy facilities. The authors also acknowledge Tianhao Wang and Jonathan Jacobson for helping with using FSP and CNC machines.

Funders	Funder number
Army Research Laboratory
University of North Texas	W911NF-13-2-0018

Keywords

Copper alloys
Friction stir processing
Hardness
Nanocrystalline microstructure
Precipitation

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10.1016/j.scriptamat.2019.01.038

Cite this

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

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.",

keywords = "Copper alloys, Friction stir processing, Hardness, Nanocrystalline microstructure, Precipitation",

author = "Subhasis Sinha and Mageshwari Komarasamy and Saket Thapliyal and Bharat Gwalani and Shivakant Shukla and Darling, {Kristopher A.} and Mishra, {Rajiv S.}",

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T1 - Immiscible nanostructured copper-aluminum-niobium alloy with excellent precipitation strengthening upon friction stir processing and aging

AU - Sinha, Subhasis

AU - Komarasamy, Mageshwari

AU - Thapliyal, Saket

AU - Gwalani, Bharat

AU - Shukla, Shivakant

AU - Darling, Kristopher A.

AU - Mishra, Rajiv S.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - 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.

AB - 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.

KW - Copper alloys

KW - Friction stir processing

KW - Hardness

KW - Nanocrystalline microstructure

KW - Precipitation

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JO - Scripta Materialia

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ER -

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

Abstract

Funding

Keywords

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