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Wear Behavior of Aluminum Alloys Made with Selective Laser Melting (SLM) Additive Manufacturing

Christy, Nicole (2019) Wear Behavior of Aluminum Alloys Made with Selective Laser Melting (SLM) Additive Manufacturing. Master's Thesis, University of Pittsburgh. (Unpublished)

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The selective laser melting (SLM) additive manufacturing process produces material properties that differ from conventionally made parts. These properties such as mechanical behavior and tribological performance may benefit certain applications. This research investigates the wear resistance of SLM additive manufactured parts, motivated by the engine piston application, where high temperatures and harsh conditions lead to sliding wear and material degradation. Hypothesized is that SLM additive manufacturing can improve the mechanical properties and tribological performance over conventional alloys by tailoring the microstructure through modifications in energy density. Standard coupons of AlSi10Mg were produced with different build parameters on the contour face and these were compared to conventionally made aluminum alloys commonly used in the engine piston application. All the samples were analyzed for composition, microstructure, mechanical behavior, and wear performance. The results have shown that the changes made to increase energy density affect the microstructure, melt pools, and the wear performance of the AM SLM samples. The highest energy density AM SLM sample has differences in microstructure, melt pools, and an increased wear performance than the lower energy density AM SLM samples. The implications of this research are to better understand how SLM build parameters affect the mechanical and tribological performance of aluminum alloys, and how this can be leveraged to optimize performance beyond that of conventionally manufactured parts.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Christy, Nicolenrc45@pitt.edtnrc45
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorJacobs, Tevistjacobs@pitt.edutjacobs
Committee MemberChmielus, Markuschmielus@pitt.educhmielus
Committee MemberXiong, Weiweixiong@pitt.eduweixiong
Date: 18 June 2019
Date Type: Publication
Defense Date: 29 March 2019
Approval Date: 18 June 2019
Submission Date: 22 March 2019
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Number of Pages: 111
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: MSMSE - Master of Science in Materials Science and Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Additive Manufacturing, AlSi10Mg, Wear, Tribology, Build Parameters
Date Deposited: 18 Jun 2019 18:27
Last Modified: 18 Jun 2024 05:15


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