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Hardness Distribution of Al2050 Parts Fabricated Using Additive Friction Stir Deposition.

Hamed Ghadimi¹, Huan Ding¹, Selami Emanet¹

¹Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.

Materials (Basel, Switzerland)

|February 11, 2023

Summary

Additive friction stir deposition (AFSD) 3D printing of Al-Cu-Li 2050 alloy creates parts with unique hardness distributions. Processing temperatures influence hardness, resulting in lower levels compared to feedstock material.

Keywords:

Al2050 additive friction stir deposition additive manufacturing microhardness microstructure

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Published on: September 11, 2018

Area of Science:

Materials Science
Additive Manufacturing
Metallurgy

Background:

Solid-state additive friction stir deposition (AFSD) is an advanced layer-by-layer metal 3D-printing technique.
Aluminum-copper-lithium (Al-Cu-Li) alloys, such as 2050, are critical in aerospace for their high strength-to-weight ratio.

Purpose of the Study:

To investigate the fabrication of Al-Cu-Li 2050 alloy parts using AFSD.
To analyze the hardness distribution and microstructural characteristics of the as-deposited parts.
To compare the properties of the 3D-printed material with the original feedstock.

Main Methods:

Additive Friction Stir Deposition (AFSD) for 3D part fabrication.
Microhardness testing across various regions of the deposited parts.
X-ray Diffraction (XRD) for phase analysis.
Energy-Dispersive Spectroscopy (EDS) mapping for elemental composition.

Main Results:

Al-Cu-Li 2050 alloy parts were successfully fabricated using AFSD.
A unique hardness distribution was observed in the as-deposited parts, attributed to location-specific processing temperatures.
XRD confirmed the presence of secondary phases, and EDS mapping indicated the formation of alloying particles within the Al2050 matrix.
AFSD components exhibited reduced microhardness compared to the feedstock material.

Conclusions:

The thermal-mechanical conditions during AFSD significantly influence the hardness distribution and overall microhardness of Al-Cu-Li 2050 alloy components.
AFSD is a viable method for producing Al-Cu-Li 2050 alloy parts, but process optimization is needed to mitigate microhardness reduction.