Influence of Compositional Changes on Mechanical Properties in Additively Manufactured Aluminum Alloys

Date & Time: 
Fri, 04/13/2018 - 2:30pm to 3:30pm
Speaker: 
Craig Brice
Affiliation: 
Lockheed Martin Space, Advanced Technology Center
Location: 
Discovery Park B155
Abstract: 

Additive manufacturing (AM) is an emerging manufacturing technology that can create functional metal parts directly from a three-dimensional computer model. While there are many benefits to AM, there are also many challenges. One of the primary challenges is maintaining consistency in the deposited material throughout the entire build process. Controlling the alloy chemistry is critical for achieving this consistency. Alloys that contain highly volatile solute elements can suffer preferential vaporization which results in a change to the expected composition. The sensitivity of the alloy to the compositional change must be quantified before it can be successfully used. This study examines compositional losses in the aluminum 2139, an Al-Cu-Mg-Ag-Mn alloy, where the Mg is the volatile component. While only present in a small amount (0.5 wt%), the Mg is key to achieving the desired microstructure and properties. The Mg promotes the formation of heterogeneous co-clusters with Cu and Ag. These clusters provide nucleation sites for the strengthening precipitate Al2Cu on the {111}Al planes. Without adequate Mg, the precipitate nucleates off defects structures on the {100}Al planes, changing the strength of the alloy considerably. This presentation will examine how Mg loss affects the deposited material in aluminum alloy 2139 fabricated by AM.

Craig Brice
Biography: 

Craig Brice is a Research Scientist Senior Staff at Lockheed Martin Space, Advanced Technology Center in Littleton, Colorado. He has over 19 years’ experience in research and development of metallic additive manufacturing processes and materials. He currently leads multiple internal and collaborative research projects in AM process and materials development. Prior to his current position, Mr. Brice worked for Lockheed Martin Aeronautics Company in their Skunk Works division in Fort Worth, Texas, and for NASA at the Langley Research Center in Hampton, Virginia. Mr. Brice has focused on alloy development for AM processes, in situ process monitoring and controls, and process qualification. He holds a B.S. in Metallurgical Engineering from Missouri University of Science and Technology and an M.S. in Materials Science and Engineering from The Ohio State University.

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